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Tracing plant source water dynamics during drought by continuous transpiration measurements: An in-situ stable isotope approach
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift) |
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ID |
4684104 |
Author(s) |
Kübert, Angelika; Dubbert, Maren; Bamberger, Ines; Kühnhammer, Kathrin; Beyer, Matthias; van Haren, Joost; Bailey, Kinzie; Hu, Jia; Meredith, Laura K; Ladd, Sarah Nemiah; Werner, Christiane |
Author(s) at UniBasel |
Ladd, Sarah Nemiah
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Year |
2023 |
Title |
Tracing plant source water dynamics during drought by continuous transpiration measurements: An in-situ stable isotope approach |
Journal |
Plant, cell & environment |
Volume |
46 |
Number |
1 |
Pages / Article-Number |
133-149 |
Keywords |
CRDS, cryogenic vacuum extraction, herbaceous species, laser spectrometry, method comparison, nonwoody, woody, xylem water |
Abstract |
The isotopic composition of xylem water (δX) is of considerable interest for plant source water studies. In-situ monitored isotopic composition of transpired water (δT) could provide a nondestructive proxy for δX-values. Using flow-through leaf chambers, we monitored 2-hourly δT-dynamics in two tropical plant species, one canopy-forming tree and one understory herbaceous species. In an enclosed rainforest (Biosphere 2), we observed δT-dynamics in response to an experimental severe drought, followed by a 2H deep-water pulse applied belowground before starting regular rain. We also sampled branches to obtain δX-values from cryogenic vacuum extraction (CVE). Daily flux-weighted δ18OT-values were a good proxy for δ18OX-values under well-watered and drought conditions that matched the rainforest's water source. Transpiration-derived δ18OX-values were mostly lower than CVE-derived values. Transpiration-derived δ2HX-values were relatively high compared to source water and consistently higher than CVE-derived values during drought. Tracing the 2H deep-water pulse in real-time showed distinct water uptake and transport responses: a fast and strong contribution of deep water to canopy tree transpiration contrasting with a slow and limited contribution to understory species transpiration. Thus, the in-situ transpiration method is a promising tool to capture rapid dynamics in plant water uptake and use by both woody and nonwoody species.
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ISSN/ISBN |
0140-7791 |
URL |
https://onlinelibrary.wiley.com/doi/10.1111/pce.14475 |
Full Text on edoc |
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Digital Object Identifier DOI |
https://doi.org/10.1111/pce.14475 |
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