the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
How plant water status drives tree source water partitioning
Abstract. The stable isotopes of oxygen and hydrogen (δ2H and δ18O) have been widely used to investigate plant water source partitioning. These tracers have shed new light on patterns of plant water use in time and space. However, this black box approach has limited our source water interpretations and mechanistic understanding. Here, we combine measurements of stable isotope composition in xylem and soil water pools with measurements of plant hydraulics, fine root distribution and soil matric potential to investigate mechanism(s) driving tree water source partitioning. We used a 2 m3 lysimeter planted with a small willow tree (Salix viminalis) to conduct a high spatial-temporal resolution experiment. We found that tree water source partitioning was driven mainly by tree water status and not by patterns of fine root distribution. Source water partitioning was regulated by plant hydraulic response to changing atmospheric demand and soil matric potential. The depth distribution of soil matric potential appeared to be the largest control on the patterns of soil water partitioning during periods of tree water deficit. Contrary to the common steady state assumption in ecohydrological source water investigations, our results show that tree water use is a dynamic process, driven by tree water deficit. Overall, our findings suggest new research foci for future plant water isotopic investigations, highlighting the importance of hydrometric measurements from the plant perspective.
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This preprint has been withdrawn.
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Preprint
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Supplement
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This preprint has been withdrawn.
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Interactive discussion
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RC1: 'Review for HESS-2019-528', Anonymous Referee #1, 07 Dec 2019
- AC1: 'Response to comments from reviewer #1', Magali Nehemy, 23 Jan 2020
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RC2: 'Review of manuscript titled “How plant water status drives tree source water partitioning” by Nehemy et al.', Anonymous Referee #2, 11 Dec 2019
- AC2: 'Response to comments from reviewer #2', Magali Nehemy, 23 Jan 2020
Interactive discussion
-
RC1: 'Review for HESS-2019-528', Anonymous Referee #1, 07 Dec 2019
- AC1: 'Response to comments from reviewer #1', Magali Nehemy, 23 Jan 2020
-
RC2: 'Review of manuscript titled “How plant water status drives tree source water partitioning” by Nehemy et al.', Anonymous Referee #2, 11 Dec 2019
- AC2: 'Response to comments from reviewer #2', Magali Nehemy, 23 Jan 2020
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Cited
Magali F. Nehemy
Paolo Benettin
Mitra Asadollahi
Dyan Pratt
Andrea Rinaldo
Jeffrey J. McDonnell
This preprint has been withdrawn.
- Preprint
(1651 KB) - Metadata XML
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Supplement
(228 KB) - BibTeX
- EndNote