Articles | Volume 20, issue 5
Hydrol. Earth Syst. Sci., 20, 2063–2083, 2016
https://doi.org/10.5194/hess-20-2063-2016
Hydrol. Earth Syst. Sci., 20, 2063–2083, 2016
https://doi.org/10.5194/hess-20-2063-2016
Research article
25 May 2016
Research article | 25 May 2016

Dominant controls of transpiration along a hillslope transect inferred from ecohydrological measurements and thermodynamic limits

Maik Renner et al.

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Cited articles

Allen, R., Pereira, L., Raes, D., and Smith, M.: Crop evapotranspiration-Guidelines for computing crop water requirements-FAO Irrigation and drainage paper 56, FAO, Rome, 300, 6541, 1998.
Alsheimer, M., Kästner, B., Falge, E., and Tenhunen, J. D.: Temporal and spatial variation in transpiration of Norway spruce stands within a forested catchment of the Fichtelgebirge, Germany, Ann. Sci. Forest Res., vol. 55, 103–123, EDP Sciences, 1998.
Aminzadeh, M., Roderick, M. L., and Or, D.: A generalized complementary relationship between actual and potential evaporation defined by a reference surface temperature, Water Resour. Res., 52, 385–406, https://doi.org/10.1002/2015WR017969, 2016.
Andrade, J. L., Meinzer, F. C., Goldstein, G., Holbrook, N. M., Cavelier, J., Jackson, P., and Silvera, K.: Regulation of water flux through trunks, branches, and leaves in trees of a lowland tropical forest, Oecologia, 115, 463–471, https://doi.org/10.1007/s004420050542, 1998.
Bachmair, S. and Weiler, M.: New Dimensions of Hillslope Hydrology, in: Forest Hydrology and Biogeochemistry, edited by: Levia, D. F., Carlyle-Moses, D., and Tanaka, T., vol. 216, 455–481, Springer Netherlands, Dordrecht, 2011.
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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.