Articles | Volume 15, issue 11
Research article 16 Nov 2011
Research article | 16 Nov 2011
Simple physics-based models of compensatory plant water uptake: concepts and eco-hydrological consequences
N. J. Jarvis
Related subject area
Subject: Ecohydrology | Techniques and Approaches: Modelling approachesEvaluating a landscape-scale daily water balance model to support spatially continuous representation of flow intermittency throughout stream networksTesting water fluxes and storage from two hydrology configurations within the ORCHIDEE land surface model across US semi-arid sitesCanopy temperature and heat stress are increased by compound high air temperature and water stress, and reduced by irrigation – A modeling analysisNovel Keeling-plot-based methods to estimate the isotopic composition of ambient water vaporDisentangling temporal and population variability in plant root water uptake from stable isotopic analysis: when rooting depth matters in labeling studiesCalibration of hydrological models for ecologically relevant streamflow predictions: a trade-off between fitting well to data and estimating consistent parameter sets?Spatial variability of mean daily estimates of actual evaporation from remotely sensed imagery and surface reference dataQuantification of soil water balance components based on continuous soil moisture measurement and the Richards equation in an irrigated agricultural field of a desert oasisMapping the suitability of groundwater-dependent vegetation in a semi-arid Mediterranean areaModeling boreal forest evapotranspiration and water balance at stand and catchment scales: a spatial approachThe 18O ecohydrology of a grassland ecosystem – predictions and observationsA comprehensive sensitivity and uncertainty analysis for discharge and nitrate-nitrogen loads involving multiple discrete model inputs under future changing conditionsDynamic responses of DOC and DIC transport to different flow regimes in a subtropical small mountainous riverEvaluation of ORCHIDEE-MICT-simulated soil moisture over China and impacts of different atmospheric forcing dataTesting an optimality-based model of rooting zone water storage capacity in temperate forestsA regional-scale ecological risk framework for environmental flow evaluationsClimate-driven disturbances in the San Juan River sub-basin of the Colorado RiverDominant effect of increasing forest biomass on evapotranspiration: interpretations of movement in Budyko spaceModeling the potential impacts of climate change on the water table level of selected forested wetlands in the southeastern United StatesCalibration of a parsimonious distributed ecohydrological daily model in a data-scarce basin by exclusively using the spatio-temporal variation of NDVIImportance of considering riparian vegetation requirements for the long-term efficiency of environmental flows in aquatic microhabitatsWaning habitats due to climate change: the effects of changes in streamflow and temperature at the rear edge of the distribution of a cold-water fishCosmic-ray neutron transport at a forest field site: the sensitivity to various environmental conditions with focus on biomass and canopy interceptionEstimation of surface energy fluxes in the Arctic tundra using the remote sensing thermal-based Two-Source Energy Balance modelEnvironmental controls on seasonal ecosystem evapotranspiration/potential evapotranspiration ratio as determined by the global eddy flux measurementsAttributing regional trends of evapotranspiration and gross primary productivity with remote sensing: a case study in the North China PlainA Budyko framework for estimating how spatial heterogeneity and lateral moisture redistribution affect average evapotranspiration rates as seen from the atmosphereRegionalization of monthly rainfall erosivity patterns in SwitzerlandCanopy-scale biophysical controls of transpiration and evaporation in the Amazon BasinTechnical note: Fourier approach for estimating the thermal attributes of streamsDominant controls of transpiration along a hillslope transect inferred from ecohydrological measurements and thermodynamic limitsCombined measurement and modeling of the hydrological impact of hydraulic redistribution using CLM4.5 at eight AmeriFlux sitesProjecting water yield and ecosystem productivity across the United States by linking an ecohydrological model to WRF dynamically downscaled climate dataThe effect of assimilating satellite-derived soil moisture data in SiBCASA on simulated carbon fluxes in Boreal EurasiaSubsurface storage capacity influences climate–evapotranspiration interactions in three western United States catchmentsReconstructing the natural hydrology of the San Francisco Bay–Delta watershedCoupled local facilitation and global hydrologic inhibition drive landscape geometry in a patterned peatlandHydrometeorological effects of historical land-conversion in an ecosystem-atmosphere model of Northern South AmericaBuilding a field- and model-based climatology of local water and energy cycles in the cultivated Sahel – annual budgets and seasonalityClimate change and stream temperature projections in the Columbia River basin: habitat implications of spatial variation in hydrologic driversEffect of parameter choice in root water uptake models – the arrangement of root hydraulic properties within the root architecture affects dynamics and efficiency of root water uptakeThe influence of methodological procedures on hydrological classification performanceLarge-scale regionalization of water table depth in peatlands optimized for greenhouse gas emission upscalingResolving terrestrial ecosystem processes along a subgrid topographic gradient for an earth-system modelDevelopment of a zoning-based environmental–ecological coupled model for lakes: a case study of Baiyangdian Lake in northern ChinaDoes consideration of water routing affect simulated water and carbon dynamics in terrestrial ecosystems?Climate and topographic controls on simulated pasture production in a semiarid Mediterranean watershed with scattered tree coverPortfolio optimisation for hydropower producers that balances riverine ecosystem protection and producer needsEco-environmentally friendly operational regulation: an effective strategy to diminish the TDG supersaturation of reservoirsGeneralized combination equations for canopy evaporation under dry and wet conditions
Songyan Yu, Hong Xuan Do, Albert I. J. M. van Dijk, Nick R. Bond, Peirong Lin, and Mark J. Kennard
Hydrol. Earth Syst. Sci., 24, 5279–5295,Short summary
There is a growing interest globally in the spatial distribution and temporal dynamics of intermittently flowing streams and rivers. We developed an approach to quantify catchment-wide flow intermittency over long time frames. Modelled patterns of flow intermittency in eastern Australia revealed highly dynamic behaviour in space and time. The developed approach is transferable to other parts of the world and can inform hydro-ecological understanding and management of intermittent streams.
Natasha MacBean, Russell L. Scott, Joel A. Biederman, Catherine Ottlé, Nicolas Vuichard, Agnès Ducharne, Thomas Kolb, Sabina Dore, Marcy Litvak, and David J. P. Moore
Hydrol. Earth Syst. Sci., 24, 5203–5230,
Xiangyu Luan and Giulia Vico
Hydrol. Earth Syst. Sci. Discuss.,
Revised manuscript accepted for HESSShort summary
Crop yield is reduced by heat and water stress, in particular when they co-occur. We quantify the joint effects of the (unpredictable) air temperature and water availability on crop heat stress via a mechanistic model. Larger but more infrequent rainfalls increased crop canopy temperatures. Keeping crops well watered via irrigation could reduce canopy temperature, but not enough to exclude heat damage. Thus, irrigation is only a partial solution to adapt to warmer and drier climates.
Yusen Yuan, Taisheng Du, Honglang Wang, and Lixin Wang
Hydrol. Earth Syst. Sci., 24, 4491–4501,Short summary
The isotopic composition of ambient water vapor is an important source of atmospheric water vapor and has not been able to be estimated to date using the Keeling plot approach. Here we proposed two new methods to estimate the isotopic composition of ambient water vapor: one using the intersection point method and another relying on the intermediate value theorem.
Valentin Couvreur, Youri Rothfuss, Félicien Meunier, Thierry Bariac, Philippe Biron, Jean-Louis Durand, Patricia Richard, and Mathieu Javaux
Hydrol. Earth Syst. Sci., 24, 3057–3075,Short summary
Isotopic labeling of soil water is a broadly used tool for tracing the origin of water extracted by plants and computing root water uptake (RWU) profiles with multisource mixing models. In this study, we show how a method such as this may misconstrue time series of xylem water isotopic composition as the temporal dynamics of RWU by simulating data collected during a tall fescue rhizotron experiment with an isotope-enabled physical soil–root model accounting for variability in root traits.
Thibault Hallouin, Michael Bruen, and Fiachra E. O'Loughlin
Hydrol. Earth Syst. Sci., 24, 1031–1054,Short summary
A hydrological model was used to compare different parameterisation strategies in view of predicting ecologically relevant streamflow indices in 33 Irish catchments. Compared for 14 different periods, a strategy fitting simulated and observed streamflow indices yielded better performance than fitting simulated and observed streamflow, but it also yielded a less consistent ensemble of parameter sets, suggesting that these indices may not be hydrologically relevant for model parameterisation.
Robert N. Armstrong, John W. Pomeroy, and Lawrence W. Martz
Hydrol. Earth Syst. Sci., 23, 4891–4907,Short summary
Digital and thermal images taken near midday were used to scale daily point observations of key factors driving actual-evaporation estimates across a complex Canadian Prairie landscape. Point estimates of actual evaporation agreed well with observed values via eddy covariance. Impacts of spatial variations on areal estimates were minor, and no covariance was found between model parameters driving the energy term. The methods can be applied further to improve land surface parameterisations.
Zhongkai Li, Hu Liu, Wenzhi Zhao, Qiyue Yang, Rong Yang, and Jintao Liu
Hydrol. Earth Syst. Sci., 23, 4685–4706,Short summary
A database of soil moisture measurements from the middle Heihe River basin of China was used to test the potential of a soil moisture database in estimating the soil water balance components (SWBCs). We determined SWBCs using a method that combined the soil water balance method and the inverse Richards equation. This work confirmed that relatively reasonable estimations of the SWBCs in coarse-textured sandy soils can be derived using soil moisture measurements.
Inês Gomes Marques, João Nascimento, Rita M. Cardoso, Filipe Miguéns, Maria Teresa Condesso de Melo, Pedro M. M. Soares, Célia M. Gouveia, and Cathy Kurz Besson
Hydrol. Earth Syst. Sci., 23, 3525–3552,Short summary
Mediterranean cork woodlands are very particular agroforestry systems present in a confined area of the Mediterranean Basin. They are of great importance due to their high socioeconomic value; however, a decrease in water availability has put this system in danger. In this paper we build a model that explains this system's tree-species distribution in southern Portugal from environmental variables. This could help predict their future distribution under changing climatic conditions.
Samuli Launiainen, Mingfu Guan, Aura Salmivaara, and Antti-Jussi Kieloaho
Hydrol. Earth Syst. Sci., 23, 3457–3480,Short summary
Boreal forest evapotranspiration and water cycle is modeled at stand and catchment scale using physiological and physical principles, open GIS data and daily weather data. The approach can predict daily evapotranspiration well across Nordic coniferous-dominated stands and successfully reproduces daily streamflow and annual evapotranspiration across boreal headwater catchments in Finland. The model is modular and simple and designed for practical applications over large areas using open data.
Regina T. Hirl, Hans Schnyder, Ulrike Ostler, Rudi Schäufele, Inga Schleip, Sylvia H. Vetter, Karl Auerswald, Juan C. Baca Cabrera, Lisa Wingate, Margaret M. Barbour, and Jérôme Ogée
Hydrol. Earth Syst. Sci., 23, 2581–2600,Short summary
We evaluated the system-scale understanding of the propagation of the oxygen isotope signal (δ18O) of rain through soil and xylem to leaf water in a temperate drought-prone grassland. Biweekly δ18O observations of the water pools made during seven growing seasons were accurately reproduced by the 18O-enabled process-based model MuSICA. While water uptake occurred from shallow soil depths throughout dry and wet periods, leaf water 18O enrichment responded to both soil and atmospheric moisture.
Christoph Schürz, Brigitta Hollosi, Christoph Matulla, Alexander Pressl, Thomas Ertl, Karsten Schulz, and Bano Mehdi
Hydrol. Earth Syst. Sci., 23, 1211–1244,Short summary
For two Austrian catchments we simulated discharge and nitrate-nitrogen (NO3-N) considering future changes of climate, land use, and point source emissions together with the impact of different setups and parametrizations of the implemented eco-hydrological model. In a comprehensive analysis we identified the dominant sources of uncertainty for the simulation of discharge and NO3-N and further examined how specific properties of the model inputs control the future simulation results.
Yu-Ting Shih, Pei-Hao Chen, Li-Chin Lee, Chien-Sen Liao, Shih-Hao Jien, Fuh-Kwo Shiah, Tsung-Yu Lee, Thomas Hein, Franz Zehetner, Chung-Te Chang, and Jr-Chuan Huang
Hydrol. Earth Syst. Sci., 22, 6579–6590,Short summary
DOC and DIC export in Taiwan shows that the annual DOC and DIC fluxes were 2.7–4.8 and 48.4–54.3 ton C km2 yr1, respectively, which were approximately 2 and 20 times higher than the global means of 1.4 and 2.6 ton C km2 yr1, respectively.
Zun Yin, Catherine Ottlé, Philippe Ciais, Matthieu Guimberteau, Xuhui Wang, Dan Zhu, Fabienne Maignan, Shushi Peng, Shilong Piao, Jan Polcher, Feng Zhou, Hyungjun Kim, and other China-Trend-Stream project members
Hydrol. Earth Syst. Sci., 22, 5463–5484,Short summary
Simulations in China were performed in ORCHIDEE driven by different forcing datasets: GSWP3, PGF, CRU-NCEP, and WFDEI. Simulated soil moisture was compared to several datasets to evaluate the ability of ORCHIDEE in reproducing soil moisture dynamics. Results showed that ORCHIDEE soil moisture coincided well with other datasets in wet areas and in non-irrigated areas. It suggested that the ORCHIDEE-MICT was suitable for further hydrological studies in China.
Matthias J. R. Speich, Heike Lischke, and Massimiliano Zappa
Hydrol. Earth Syst. Sci., 22, 4097–4124,Short summary
To simulate the water balance of, e.g., a forest plot, it is important to estimate the maximum volume of water available to plants. This depends on soil properties and the average depth of roots. Rooting depth has proven challenging to estimate. Here, we applied a model assuming that plants dimension their roots to optimize their carbon budget. We compared its results with values obtained by calibrating a dynamic water balance model. In most cases, there is good agreement between both methods.
Gordon C. O'Brien, Chris Dickens, Eleanor Hines, Victor Wepener, Retha Stassen, Leo Quayle, Kelly Fouchy, James MacKenzie, P. Mark Graham, and Wayne G. Landis
Hydrol. Earth Syst. Sci., 22, 957–975,Short summary
In global water resource allocation, robust tools are required to establish environmental flows. In addition, tools should characterize past, present and future consequences of altered flows and non-flow variables to social and ecological management objectives. PROBFLO is a risk assessment method designed to meet best practice principles for regional-scale holistic E-flow assessments. The approach has been developed in Africa and applied across the continent.
Katrina E. Bennett, Theodore J. Bohn, Kurt Solander, Nathan G. McDowell, Chonggang Xu, Enrique Vivoni, and Richard S. Middleton
Hydrol. Earth Syst. Sci., 22, 709–725,Short summary
We applied the Variable Infiltration Capacity hydrologic model to examine scenarios of change under climate and landscape disturbances in the San Juan River basin, a major sub-watershed of the Colorado River basin. Climate change coupled with landscape disturbance leads to reduced streamflow in the San Juan River basin. Disturbances are expected to be widespread in this region. Therefore, accounting for these changes within the context of climate change is imperative for water resource planning.
Fernando Jaramillo, Neil Cory, Berit Arheimer, Hjalmar Laudon, Ype van der Velde, Thomas B. Hasper, Claudia Teutschbein, and Johan Uddling
Hydrol. Earth Syst. Sci., 22, 567–580,Short summary
Which is the dominant effect on evapotranspiration in northern forests, an increase by recent forests expansion or a decrease by the water use response due to increasing CO2 concentrations? We determined the dominant effect during the period 1961–2012 in 65 Swedish basins. We used the Budyko framework to study the hydroclimatic movements in Budyko space. Our findings suggest that forest expansion is the dominant driver of long-term and large-scale evapotranspiration changes.
Jie Zhu, Ge Sun, Wenhong Li, Yu Zhang, Guofang Miao, Asko Noormets, Steve G. McNulty, John S. King, Mukesh Kumar, and Xuan Wang
Hydrol. Earth Syst. Sci., 21, 6289–6305,Short summary
Forested wetlands provide myriad ecosystem services threatened by climate change. This study develops empirical hydrologic models by synthesizing hydrometeorological data across the southeastern US. We used global climate projections to model hydrological changes for five wetlands. We found all wetlands are predicted to become drier by the end of this century. This study suggests that climate change may substantially affect wetland biogeochemical cycles and other functions in the future.
Guiomar Ruiz-Pérez, Julian Koch, Salvatore Manfreda, Kelly Caylor, and Félix Francés
Hydrol. Earth Syst. Sci., 21, 6235–6251,Short summary
Plants are shaping the landscape and controlling the hydrological cycle, particularly in arid and semi-arid ecosystems. Remote sensing data appears as an appealing source of information for vegetation monitoring, in particular in areas with a limited amount of available field data. Here, we present an example of how remote sensing data can be exploited in a data-scarce basin. We propose a mathematical methodology that can be used as a springboard for future applications.
Rui Rivaes, Isabel Boavida, José M. Santos, António N. Pinheiro, and Teresa Ferreira
Hydrol. Earth Syst. Sci., 21, 5763–5780,Short summary
We analyzed the influence of considering riparian requirements for the long-term efficiency of environmental flows. After a decade, environmental flows disregarding riparian requirements promoted riparian degradation and consequently the change in the hydraulic characteristics of the river channel and the modification of the available habitat area for fish species. Environmental flows regarding riparian vegetation requirements were able to sustain the fish habitat close to the natural condition.
José María Santiago, Rafael Muñoz-Mas, Joaquín Solana-Gutiérrez, Diego García de Jalón, Carlos Alonso, Francisco Martínez-Capel, Javier Pórtoles, Robert Monjo, and Jaime Ribalaygua
Hydrol. Earth Syst. Sci., 21, 4073–4101,Short summary
High-time-resolution models for streamflow and stream temperature are used in this study to predict future brown trout habitat loss. Flow reductions falling down to 51 % of current values and water temperature increases growing up to 4 ºC are predicted. Streamflow and temperature will act synergistically affecting fish. We found that the thermal response of rivers is influenced by basin geology and, consequently, geology will be also an influent factor in the cold-water fish distribution shift.
Mie Andreasen, Karsten H. Jensen, Darin Desilets, Marek Zreda, Heye R. Bogena, and Majken C. Looms
Hydrol. Earth Syst. Sci., 21, 1875–1894,Short summary
The cosmic-ray method holds a potential for quantifying canopy interception and biomass. We use measurements and modeling of thermal and epithermal neutron intensity in a forest to examine this potential. Canopy interception is a variable important to forest hydrology, yet difficult to monitor remotely. Forest growth impacts the carbon-cycle and can be used to mitigate climate changes by carbon sequestration in biomass. An efficient method to monitor tree growth is therefore of high relevance.
Jordi Cristóbal, Anupma Prakash, Martha C. Anderson, William P. Kustas, Eugénie S. Euskirchen, and Douglas L. Kane
Hydrol. Earth Syst. Sci., 21, 1339–1358,Short summary
Quantifying trends in surface energy fluxes is crucial for forecasting ecological responses in Arctic regions. An extensive evaluation using a thermal-based remote sensing model and ground measurements was performed in Alaska's Arctic tundra for 5 years. Results showed an accurate temporal trend of surface energy fluxes in concert with vegetation dynamics. This work builds toward a regional implementation over Arctic ecosystems to assess response of surface energy fluxes to climate change.
Chunwei Liu, Ge Sun, Steven G. McNulty, Asko Noormets, and Yuan Fang
Hydrol. Earth Syst. Sci., 21, 311–322,Short summary
The paper aimed at deriving Kc (AET/PET) for multiple vegetation types and understanding its environmental controls by analyzing the accumulated global eddy flux (FLUXNET) data. We established multiple linear equations for different land covers and seasons to model the dynamics of Kc as function of LAI, site latitude, and precipitation. Our study extended the applications of the traditional Kc method for estimating crop water use to estimating AET rates for natural ecosystems.
Xingguo Mo, Xuejuan Chen, Shi Hu, Suxia Liu, and Jun Xia
Hydrol. Earth Syst. Sci., 21, 295–310,Short summary
Attributing changes in ET and GPP is crucial to impact and adaptation assessment of climate change over the NCP. Simulations with the VIP ecohydrological model illustrated relative contributions of climatic change, CO2 fertilization, and management to ET and GPP. Global radiation was the cause of GPP decline in summer, while air warming intensified the water cycle and advanced plant productivity in spring. Agronomical improvement was the main driver of crop productivity enhancement.
Elham Rouholahnejad Freund and James W. Kirchner
Hydrol. Earth Syst. Sci., 21, 217–233,Short summary
Our analysis shows that averaging over sub-grid heterogeneity in precipitation and potential evapotranspiration (ET), as typical earth system models do, overestimates the average of the spatially variable ET. We also show when aridity index increases with altitude, lateral redistribution would transfer water from more humid uplands to more arid lowlands, resulting in a net increase in ET. Therefore, the Earth system models that neglect lateral transfer underestimate ET in those regions.
Simon Schmidt, Christine Alewell, Panos Panagos, and Katrin Meusburger
Hydrol. Earth Syst. Sci., 20, 4359–4373,Short summary
We present novel research on the seasonal dynamics of the impact of rainfall (R-factor) on the mobilization of topsoil as soil erosion by water for Switzerland. A modeling approach was chosen that enables the dynamical mapping of the R-factor. Based on the maps and modeling results, we could investigate the spatial and temporal distribution of that factor, which is high for Switzerland. With these results, agronomists can introduce selective erosion control measures.
Kaniska Mallick, Ivonne Trebs, Eva Boegh, Laura Giustarini, Martin Schlerf, Darren T. Drewry, Lucien Hoffmann, Celso von Randow, Bart Kruijt, Alessandro Araùjo, Scott Saleska, James R. Ehleringer, Tomas F. Domingues, Jean Pierre H. B. Ometto, Antonio D. Nobre, Osvaldo Luiz Leal de Moraes, Matthew Hayek, J. William Munger, and Steven C. Wofsy
Hydrol. Earth Syst. Sci., 20, 4237–4264,Short summary
While quantifying vegetation water use over multiple plant function types in the Amazon Basin, we found substantial biophysical control during drought as well as a water-stress period and dominant climatic control during a water surplus period. This work has direct implication in understanding the resilience of the Amazon forest in the spectre of frequent drought menace as well as the role of drought-induced plant biophysical functioning in modulating the water-carbon coupling in this ecosystem.
Masahiro Ryo, Marie Leys, and Christopher T. Robinson
Hydrol. Earth Syst. Sci., 20, 3411–3418,Short summary
We developed an analytical method to estimate thermal attributes (seasonal and diel periodicities as well as irregularities) in stream temperature at data-poor sites. We extrapolated the thermal attributes of a glacier-fed stream in the Swiss Alps using 2 years of hourly recorded temperature to the data-poor sites. The R scripts used in this study are available in the Supplement.
Maik Renner, Sibylle K. Hassler, Theresa Blume, Markus Weiler, Anke Hildebrandt, Marcus Guderle, Stanislaus J. Schymanski, and Axel Kleidon
Hydrol. Earth Syst. Sci., 20, 2063–2083,Short summary
We estimated forest transpiration (European beech) along a steep valley cross section. Atmospheric demand, obtained by the thermodynamic limit of maximum power, is the dominant control of transpiration at all sites. To our surprise we find that transpiration is rather similar across sites with different aspect (north vs. south) and different stand structure due to systematically varying sap velocities. Such a compensation effect is highly relevant for modeling and upscaling of transpiration.
Congsheng Fu, Guiling Wang, Michael L. Goulden, Russell L. Scott, Kenneth Bible, and Zoe G. Cardon
Hydrol. Earth Syst. Sci., 20, 2001–2018,Short summary
Hydraulic redistribution (HR) of plant root has important hydrological impact (on evapotranspiration, Bowen ratio, and soil moisture) in ecosystems that have a pronounced dry season but are not overall so dry that sparse vegetation and very low soil moisture limit HR.
Shanlei Sun, Ge Sun, Erika Cohen, Steven G. McNulty, Peter V. Caldwell, Kai Duan, and Yang Zhang
Hydrol. Earth Syst. Sci., 20, 935–952,Short summary
This study links an ecohydrological model with WRF (Weather Research and Forecasting Model) dynamically downscaled climate projections of the HadCM3 model under the IPCC SRES A2 emission scenario. Water yield and ecosystem productivity response to climate change were highly variable with an increasing trend across the 82 773 watersheds. Results are useful for policy-makers and land managers in formulating appropriate watershed-specific strategies for sustaining water and carbon sources.
M. K. van der Molen, R. A. M. de Jeu, W. Wagner, I. R. van der Velde, P. Kolari, J. Kurbatova, A. Varlagin, T. C. Maximov, A. V. Kononov, T. Ohta, A. Kotani, M. C. Krol, and W. Peters
Hydrol. Earth Syst. Sci., 20, 605–624,Short summary
Boreal Eurasia contains extensive forests, which play an important role in the terrestrial carbon cycle. Droughts can modify this cycle considerably, although very few ground-based observations are available in the region. We test whether satellite-observed soil moisture may be used to improve carbon cycle models in this region. This paper explains when and where this works best. The interpretation of satellite soil moisture is best in summer conditions, and is hampered by snow, ice and ponding.
E. S. Garcia and C. L. Tague
Hydrol. Earth Syst. Sci., 19, 4845–4858,Short summary
In forests of the western United States, annual evapotranspiration (ET) varies with precipitation and temperature; geologically mediated drainage and storage properties may influence the relationship between climate and ET. A process-based model is used to evaluate how water storage capacity influences model estimates of ET-climate relationships for three snow-dominated basins. Results show that uncertainty in subsurface properties can strongly influence model estimates of watershed-scale ET.
P. Fox, P. H. Hutton, D. J. Howes, A. J. Draper, and L. Sears
Hydrol. Earth Syst. Sci., 19, 4257–4274,Short summary
The development of California was facilitated by redistributing water from the natural landscape to other uses. This development was accompanied by declines in native aquatic species, which have been attributed to reductions in Delta outflow. By reconstructing the natural landscape and using water balances to estimate natural Delta outflow, this flow is shown to be consistent with current outflow on a long-term annual average basis.
S. Acharya, D. A. Kaplan, S. Casey, M. J. Cohen, and J. W. Jawitz
Hydrol. Earth Syst. Sci., 19, 2133–2144,
R. G. Knox, M. Longo, A. L. S. Swann, K. Zhang, N. M. Levine, P. R. Moorcroft, and R. L. Bras
Hydrol. Earth Syst. Sci., 19, 241–273,
C. Velluet, J. Demarty, B. Cappelaere, I. Braud, H. B.-A. Issoufou, N. Boulain, D. Ramier, I. Mainassara, G. Charvet, M. Boucher, J.-P. Chazarin, M. Oï, H. Yahou, B. Maidaji, F. Arpin-Pont, N. Benarrosh, A. Mahamane, Y. Nazoumou, G. Favreau, and J. Seghieri
Hydrol. Earth Syst. Sci., 18, 5001–5024,Short summary
Long-term average water and energy cycles are described for two main land cover types in the cultivated Sahel (millet crop and fallow bush). Mean seasonal cycles and annual budgets for all component variables were estimated from detailed field and model analysis. Evapotranspiration totals over 80% of rainfall for both covers, but with different time distribution and soil/plant contributions. The remainder is shared between runoff and deep drainage for the crop, but is only runoff for the fallow.
D. L. Ficklin, B. L. Barnhart, J. H. Knouft, I. T. Stewart, E. P. Maurer, S. L. Letsinger, and G. W. Whittaker
Hydrol. Earth Syst. Sci., 18, 4897–4912,Short summary
We use a hydrologic model coupled with a stream temperature model and downscaled general circulation model outputs to explore changes in stream temperature in the Columbia River basin for the late 21st century. On average, stream temperatures are projected to increase 3.5 °C for the spring, 5.2 °C for the summer, 2.7 °C for the fall, and 1.6 °C for the winter. Our results capture the important, and often ignored, influence of hydrological processes on changes in stream temperature.
M. Bechmann, C. Schneider, A. Carminati, D. Vetterlein, S. Attinger, and A. Hildebrandt
Hydrol. Earth Syst. Sci., 18, 4189–4206,
F. J. Peñas, J. Barquín, T. H. Snelder, D. J. Booker, and C. Álvarez
Hydrol. Earth Syst. Sci., 18, 3393–3409,
M. Bechtold, B. Tiemeyer, A. Laggner, T. Leppelt, E. Frahm, and S. Belting
Hydrol. Earth Syst. Sci., 18, 3319–3339,
Z. M. Subin, P. C. D. Milly, B. N. Sulman, S. Malyshev, and E. Shevliakova
Hydrol. Earth Syst. Sci. Discuss.,
Y. W. Zhao, M. J. Xu, F. Xu, S. R. Wu, and X. A. Yin
Hydrol. Earth Syst. Sci., 18, 2113–2126,
G. Tang, T. Hwang, and S. M. Pradhanang
Hydrol. Earth Syst. Sci., 18, 1423–1437,
J. Lozano-Parra, M. P. Maneta, and S. Schnabel
Hydrol. Earth Syst. Sci., 18, 1439–1456,
X. A. Yin, Z. F. Yang, and C. L. Liu
Hydrol. Earth Syst. Sci., 18, 1359–1368,
J. Feng, R. Li, R. Liang, and X. Shen
Hydrol. Earth Syst. Sci., 18, 1213–1223,
J. P. Lhomme and C. Montes
Hydrol. Earth Syst. Sci., 18, 1137–1149,
Alavi, G., Jansson, P.-E., and Hallgren, J.-E.: Interception of a dense spruce forest, performance of a simplified canopy water balance model, Nord. Hydrol., 32, 265–284, 2001.
Alton, P., Fisher, R., Los, S., and Williams, M.: Simulations of global evapotranspiration using semiempirical and mechanistic schemes of plant hydrology, Global Biogeochem. Cy., 23, GB4023, https://doi.org/10.1029/2009GB003540, 2009.
Arya, L. M., Blake, G. R., and Farrell, D. A.: A field study of soil water depletion patterns in presence of growing soybean roots. II. Effect of plant growth on soil water pressure and water loss patterns, Soil Sci. Soc. Am. J., 39, 430–436, 1975a.
Arya, L. M., Blake, G. R., and Farrell, D. A.: A field study of soil water depletion patterns in presence of growing soybean roots. III. Rooting characteristics and root extraction of soil water, Soil Sci. Soc. Am. J., 39, 437–444, 1975b.
Asner, G. P., Scurlock, J. M. O., and Hicke, J. A.: Global synthesis of leaf area index observations: implications for ecological and remote sensing studies, Global Ecol. Biogeogr., 12, 191–205, 2003.
Benjamin, J. G. and Nielsen, D. C.: Water deficit effects on root distribution of soybean, field pea and chickpea, Field Crop. Res., 97, 248–253, 2006.
Beven, K.: Prophecy, reality and uncertainty in distributed hydrological modeling, Adv. Water Res., 16, 41–51, 1993.
Bodner, G., Loiskandl, W., and Kaul, H.-P.: Cover crop evapotranspiration under semi-arid conditions using FAO dual crop coefficient method with water stress compensation, Agr. Water Manage., 93, 85–98, 2007.
Braud, I., Varado, N., and Olioso, A.: Comparison of root water uptake modules using either the surface energy balance or potential transpiration, J. Hydrol., 301, 267–286, 2005.
Breuer, L., Eckhardt, K., and Frede, H.-G.: Plant parameter values for models in temperate climates, Ecol. Modell., 169, 237–293, 2003.
Budyko, M. I.: Climate and life. Academic Press, Orlando, Florida, 508 pp., 1974.
Cabelguenne, M. and Debaeke, P.: Experimental determination and modeling of the soil water extraction capacities of crops of maize, sunflower, soya bean, sorghum and wheat, Plant Soil, 202, 175–192, 1998.
Caldwell, M. M., Dawson, T. E., and Richards, J. H.: Hydraulic lift: consequences of water efflux from the roots of plants, Oecologia, 113, 151–161, 1998.
Carmi, A., Plaut, Z., and Sinai, M.: Cotton root growth as affected by changes in soil water distribution and their impact on plant tolerance to drought, Irrigation Sci., 13, 177–183, 1993.
Casaroli, D., de Jong van Lier, Q., and Neto, D. D.: Validation of a root water uptake model to estimate transpiration constraints, Agr. Water Manage., 97, 1382–1388, 2010.
Celette, F., Gaudin, R., and Gary, C.: Spatial and temporal changes to the water regime of a Mediterranean vineyard due to the adoption of cover cropping, Eur. J. Agron., 29, 153–162, 2008.
Clausnitzer, V. and Hopmans, J. W.: Simultaneous modeling of transient three-dimensional root growth and soil water flow, Plant Soil, 164, 299–314, 1994.
Cleverly, J. R., Dahm, C. N., Thibault, J. R., McDonnell, D. E., and Allred Coonrod, J. E.: Riparian ecohydrology: regulation of water flux from the ground to the atmosphere in the middle Rio Grande, New Mexico, Hydrol. Process., 20, 3207–3225, 2006.
Coelho, E. F. and Or, D.: Root distribution and water uptake patterns of corn under surface and subsurface drip irrigation, Plant Soil, 206, 123–136, 1999.
Dawson, T. E.: Hydraulic lift and water use by plants: implications for water balance, performance and plant-plant interactions, Oecologia, 95, 565–574, 1993.
de Bruin, H. A. R.: A model for the Priestley-Taylor parameter α, J. Clim. Appl. Meteorol., 22, 572–578, 1983.
de Jong van Lier, Q., Metselaar, K., and van Dam, J. C.: Root water extraction and limiting soil hydraulic conditions estimated by numerical simulation, Vadose Zone J., 5, 1264–1277, 2006.
de Jong van Lier, Q., van Dam, J. C., Metselaar, K., de Jong, R., and Duijnisveld, W. H. M.: Macroscopic root water uptake distribution using a matric flux potential approach, Vadose Zone J., 7, 1065–1078, 2008.
de Jong van Lier, Q., Dourado Neto, D., and Metselaar, K.: Modeling of transpiration reduction in van Genuchten-Mualem type soils, Water Resour. Res., 45, W02422, https://doi.org/10.1029/2008WR006938, 2009.
Desborough, C. E.: The impact of root weighting on the response of transpiration to moisture stress in land surface schemes, Mon. Weather Rev., 125, 1920–1930, 1997.
Doussin, C.: Soil exploration and resource acquisition by plant roots: an architectural and modelling point of view, Agronomie, 23, 419–431, 2003.
Draye, X., Kim, Y., Lobet, G., and Javaux, M.: Model-assisted integration of physiological and environmental constraints affecting the dynamic and spatial patterns of root water uptake from soils, J. Exp. Bot., 61, 2145–2155, 2010.
El-Maayar, M., Price, D. T., and Chen, J. M.: Simulating daily, monthly and annual water balances in a land surface model using alternative root water uptake schemes, Adv. Water Res., 32, 1444–1459, 2009.
Engels, C., Mollenkopf, M., and Marschner, H.: Effect of drying and rewetting the topsoil on root growth of maize and rape in different soil depths, Z. Pflanzenernähr. Bodenk., 157, 139–144, 1994.
Enquist, B. J. and Niklas, K. J.: Global allocation rules for patterns of biomass partitioning in seed plants, Science, 295, 1517–1520, 2002.
Faria, L. N., Da Rocha, M. G., De Jong van Lier, Q., and Casaroli, D.: A split-pot experiment with sorghum to test a root water uptake partitioning model, Plant Soil, 331, 299–311, 2010.
Feddes, R. A., Kowalik, P., and Zaradny, H.: Simulation of field water use and crop yield, Pudoc, Wageningen, The Netherlands, 189 pp., 1978.
Gale, M. R. and Grigal, D. F.: Vertical root distributions of northern tree species in relation to successional status, Can. J. Forest Res., 17, 829–834, 1987.
Gazal, R. M., Scott, R. L., Goodrich, D. C., and Williams D. G.: Controls on transpiration in a semiarid riparian cottonwood forest, Agr. Forest Meteorol., 137, 56–67, 2006.
Green, S. R. and Clothier, B. E.: Root water uptake by kiwifruit vines following partial wetting of the root zone, Plant Soil, 173, 317–328, 1995.
Jackson, R. B., Mooney, H. A., and Schulze, E.-D.: A global budget for fine root biomass, surface area, and nutrient contents, Proc. Natl. Acad. Sci., 94, 7632–7366, 1997.
Javaux, M., Schröder, T., Vanderborght, J., and Vereecken, H.: Use of three-dimensional detailed modeling approach for predicting root water uptake, Vadose Zone J., 7, 1079–1088, 2008.
Jarvis, N. J .: A simple empirical model of root water uptake, J. Hydrol., 107, 57–72, 1989.
Jarvis, N. J.: Simulation of soil water dynamics and herbicide persistence in a silt loam soil using the MACRO model, Ecol. Modell., 81, 97–109, 1995.
Jarvis, N. J.: Comment on "Macroscopic root water uptake distribution using a matric flux potential approach", Vadose Zone J., 9, 499–502, 2010.
Jarvis, P. G.: Interpretation of variations in leaf water potential and stomatal conductance found in canopies in field, T. Roy. Soc. London, 273, 593–610, 1976.
Jipp, P. H., Nepstad, D. C., Cassel, D. K., and Reis de Carvalho, C.: Deep soil moisture storage and transpiration in forests and pastures of seasonally-dry Amazonia, Climatic Change, 39, 395–412, 1998.
Kager, H., Kochler, M., and Stützel, H.: Root growth and dry matter partitioning of cauliflower under drought stress conditions: measurement and simulation, Eur. J. Agron., 20, 379–394, 2004.
Kergoat, L.: A model for hydrological equilibrium of leaf area index on a global scale, J. Hydrol., 212–213, 268–286, 1998.
Kleidon, A. and Heimann, M.: Optimised rooting depth and its impacts on the simulated climate of an atmospheric general circulation model, Geophys. Res. Lett., 25, 345–348, 1998.
Kleidon, A. and Schymanski, S.: Thermodynamics and optimality of the water budget on land: a review, Geophys. Res. Lett., 35, L20404, https://doi.org/10.1029/2008GL035393, 2008.
Klepper, B., Taylor, H. M., Huck, M. G., Fiscus, E. L.: Water relations and growth of cotton in drying soil, Agronomy J., 65, 307–310, 1973.
Kochendorfer, J. P. and Ram\'irez, J. A.: Ecohydrologic controls on vegetation density and evapotranspiration partitioning across the climatic gradients of the central United States, Hydrol. Earth Syst. Sci., 14, 2121–2139, https://doi.org/10.5194/hess-14-2121-2010, 2010.
Lamontagne, S., Cook, P. G., O'Grady, A., and Eamus, D.: Groundwater use by vegetation in a tropical savanna riparian zone (Daly River, Australia), J. Hydrol., 310, 280–293, 2005.
Lane, D. R., Coffin, D. P., and Lauenroth, W. K.: Changes in grassland canopy structure across a precipitation gradient, J. Veg. Sci., 11, 359–368, 2000.
Larsbo, M., Roulier, S., Stenemo, F., Kasteel, R., and Jarvis, N. J.: An improved dual-permeability model of water flow and solute transport in the vadose zone, Vadose Zone J., 4, 398–406, 2005.
Lawrence, P. J. and Chase, T. N.: Climate impacts of making evapotranspiration in the community land model (CLM3) consistent with the simple biosphere model (SiB), J. Hydrometeorol., 10, 374–394, 2009.
Lee, J.-E., Oliveira, R. S., Dawson, T. E., and Fung, I.: Root functioning modifies seasonal climate, Proc. Natl. Acad. Sci., 102, 17576–17581, 2005.
Markewitz, D., Devine, S., Davidson, E. A., Brando, P., and Nepstad, D. C.: Soil moisture depletion under simulated drought in the Amazon: impacts on deep root uptake, New Phytol., 187, 592–607, 2010.
Meyer, W. S., Tan, C. S., Barrs, H. D., and Smith, R. C. G.: Root growth and water uptake by wheat during drying of undisturbed and repacked soil in drainage lysimeters, Aust. J. Agric. Res., 41, 253–265, 1990.
Mokany, K., Raison, R. J., and Prokushkin, A. S.: Critical analysis of root:shoot ratios in terrestrial biomes, Glob. Change Biol., 12, 84–96, 2006.
Monteith, J. L.: Accommodation between transpiring vegetation and the convective boundary layer, J. Hydrol., 166, 251–263, 1995.
Neilson, R. P.: A model for predicting continental-scale vegetation distribution and water balance, Ecol. Appl., 5, 362–386, 1995.
Nnyamah, J. U. and Black, T. A.: Rates and patterns of water uptake in a Douglas-fir forest, Soil Sci. Soc. Am. J., 41, 972–979, 1977.
Novák, V.: Estimation of soil-water extraction patterns by roots, Agr. Water Manage., 12, 271–278, 1987.
Oliveira, R. S., Bezerra, L., Davidson, E. A., Pinto, F., Klink C. A., Nepstad, D. C., and Moreira, A.: Deep root function in soil water dynamics in cerrado savannas of central Brazil, Funct. Ecol., 19, 574–581, 2005.
Paço, T. A., David, T. S., Henriques, M. O., Pereira, J. S., Valente, F., Banza, J., Pereira, F. L., Pinto, C., and David, J. S.: Evapotranspiration from a Mediterranean evergreen oak savannah: the role of trees and pasture, J. Hydrol., 369, 98–106, 2009.
Peek, M. S., Leffler, A. J., Hipps, L., Ivans, S., Ryel, R. J., and Caldwell, M. M.: Root turnover and relocation in the soil profile in response to seasonal soil water variation in a natural stand of Utah juniper (Juniperus osteosperma), Tree Physiol., 26, 1469–1476, 2006.
Polley, H. W., Phillips, R. L., Frank, A. B., Bradford, J. A., Sims, P. L., Morgan, J. A., and Kiniry, J. R.: Variability in light-use efficiency for gross primary productivity on Great Plains grasslands, Ecosystems, 14, 15–27, 2011.
Sala, O. E., Parton, W. J., Joyce, L. A., and Lauenroth, W. K.: Primary production of the central grassland region of the United States, Ecology, 69, 40–45, 1988.
Seneviratne, S. I., Corti, T., Davin, E. L., Hirschi, M., Jaeger, E. B., Lehner, I., Orlowsky, B., and Teuling A. J.: Investigating soil moisture-climate interactions in a changing climate: a review, Earth-Sci. Rev., 99, 125–161, 2010.
Schaefli, B., Harman, C. J., Sivapalan, M., and Schymanski, S. J.: HESS Opinions: Hydrologic predictions in a changing environment: behavioral modeling, Hydrol. Earth Syst. Sci., 15, 635–646, https://doi.org/10.5194/hess-15-635-2011, 2011.
Schenk, H.-J. and Jackson, R. B.: The global biogeography of roots, Ecol. Monographs, 72, 311–328, 2002.
Schröder, T., Javaux, M., Vanderborght, J., and Vereecken, H.: Comment on "Root water extraction and limiting soil hydraulic conditions estimated by numerical simulation", Vadose Zone J., 6, 524–526, 2007.
Schulze, E.-D., Kelliher, F. M., Körner, C., Lloyd, J., and Leuning, R.: Relationships among maximum stomatal conductance, ecosystem surface conductance, carbon assimilation rate, and plant nitrogen nutrition: a global ecology scaling exercise, Annual Rev. Ecol. Syst., 25, 629–662, 1994.
Schymanski, S. J., Sivapalan, M., Roderick, M. L., Beringer, J., and Hutley, L. B.: An optimality-based model of the coupled soil moisture and root dynamics, Hydrol. Earth Syst. Sci., 12, 913–932, https://doi.org/10.5194/hess-12-913-2008, 2008.
Schymanski, S. J., Sivapalan, M., Roderick, M. L., Hutley, L. B., and Beringer, J.: An optimality-based model of the dynamic feedbacks between natural vegetation and the water balance, Water Resour. Res., 45, W01412, https://doi.org/10.1029/2008WR006841, 2009.
Sharp, R. E. and Davies, W. J.: Root growth and water uptake by maize plants in drying soil, J. Exp. Bot., 36, 1441–1456, 1985.
Šimùnek, J. and Hopmans, J. W.: Modeling compensated root water and nutrient uptake, Ecol. Modell., 220, 505–521, 2009.
Sitch, S., Smith, B., Prentice, I. C., Arneth, A., Bondeau, A., Cramer, W., Kaplan, J. O., Levis, S., Lucht, W., Sykes, M. T., Thonicke, K., and Venevsky, S.: Evaluation of ecosystem dynamics, plant geography and terrestrial carbon cycling in the LPJ dynamic global vegetation model, Glob. Change Biol., 9, 161–185, 2003.
Somma, F., Hopmans, J. W., and Clausnitzer, V.: Transient three-dimensional modeling of soil water and solute transport with simultaneous root growth, root water and nutrient uptake, Plant Soil, 202, 281–293, 1998.
Teuling, A. J., Uijlenhoet, R., Hupet, F., and Troch, P. A.: Impact of plant water uptake strategy on soil moisture and evapotranspiration dynamics during drydown, Geophys. Res. Lett., 33, L03401, https://doi.org/10.1029/2005GL025019, 2006a.
Teuling, A. J., Seneviratne, S. I., Williams, C., and Troch, P. A.: Observed timescales of evapotranspiration response to soil moisture, Geophys. Res. Lett., 33, L23403, https://doi.org/10.1029/2006GL028178, 2006b.
Van Genuchten, M. T.: A closed form equation for predicting the hydraulic conductivity of unsaturated soils, Soil Sci. Soc. Am. J., 44, 892–898, 1980.
Varado, N., Braud, I., and Ross, P. J.: Development and assessment of an efficient vadose zone module solving the 1D Richards' equation and including root extraction by plants, J. Hydrol., 323, 258–275, 2006.
Wan, C., Yilmaz, I., and Sosebee, R. E.: Seasonal soil-water availability influences snakeweed root dynamics, J. Arid Environ., 51, 255–264, 2002.
Wang, E. and Smith, C. J.: Modelling the growth and water uptake function of plant root systems: a review, Australian J. Agric. Res., 55, 501–523, 2004.
White, R. G. and Kirkegaard, J. A.: The distribution and abundance of wheat roots in a dense, structured subsoil – implications for water uptake, Plant, Cell and Environment, 33, 133–148, 2010.
Woodward, F. I.: Climate and plant distribution. Cambridge University Press, Cambridge, UK, 174 pp., 1987.
Wösten, J. H. M., Lilly, A., and Nemes, A.: Development and use of a database of hydraulic properties of European soils, Geoderma, 90, 169–185, 1999.
Wraith, J. M. and Wright, C. K.: Soil water and root growth, HortScience, 33, 951–959, 1998.
Yadav, B. K., Mathur, S., and Siebel, M. A.: Soil moisture dynamics modeling considering the root compensation mechanism for water uptake by plants, J. Hydrol. Eng., 14, 913–922, 2009.
Zencich, S. J., Froend, R. H., Turner, J. V., and Gailitis, V.: Influence of groundwater depth on the seasonal sources of water accessed by Banksia tree species on a shallow, sandy coastal aquifer, Oecologia, 131, 8–19, 2002.
Zeng, X., Dai, Y., Dickinson, R., and Shaikh, M.: The role of root distribution for climate simulation over land, Geophys. Res. Lett., 25, 4533–4536, 1998.
Zhang, H., Morison, J. I. L., and Simmonds, L. P.: Transpiration and water relations of poplar trees growing close to the water table, Tree Physiol., 19, 563–573, 1999.
Zhou, X., Talley, M., and Luo, Y.: Biomass, litter, and soil respiration along a precipitation gradient in Southern Great Plains USA, Ecosystems, 12, 1369–1380, 2009.
Zuo, Q., Shi, J., Li, Y., and Zhang, R.: Root length density and water uptake distributions of winter wheat under sub-irrigation, Plant Soil, 285, 45–55, 2006.