دورية أكاديمية
Modelling temporal variability of in situ soil water and vegetation isotopes reveals ecohydrological couplings in a riparian willow plot
العنوان: | Modelling temporal variability of in situ soil water and vegetation isotopes reveals ecohydrological couplings in a riparian willow plot |
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المؤلفون: | A. Smith, D. Tetzlaff, J. Landgraf, M. Dubbert, C. Soulsby |
المصدر: | Biogeosciences, Vol 19, Pp 2465-2485 (2022) |
بيانات النشر: | Copernicus Publications, 2022. |
سنة النشر: | 2022 |
المجموعة: | LCC:Ecology LCC:Life LCC:Geology |
مصطلحات موضوعية: | Ecology, QH540-549.5, Life, QH501-531, Geology, QE1-996.5 |
الوصف: | The partitioning of water fluxes in the critical zone is of great interest due to the implications for understanding water cycling and quantifying water availability for various ecosystem services. We used the tracer-aided ecohydrological model EcH2O-iso to use stable water isotopes to help evaluate water, energy, and biomass dynamics at an intensively monitored study plot under two willow trees, a riparian species, in Berlin, Germany. Importantly, we assessed the value of in situ soil and plant water isotope data in helping to quantify xylem water sources and transit times, with coupled estimates of the temporal dynamics and ages of soil and root uptake water. The willows showed high water use through evapotranspiration, with limited percolation of summer precipitation to deeper soil layers due to the dominance of shallow root uptake (>80 % in the upper 10 cm, 70 %–78 % transpiration/evapotranspiration). Lower evapotranspiration under grass (52 %–55 % transpiration/evapotranspiration) resulted in higher soil moisture storage, greater soil evaporation, and more percolation of soil water. Biomass allocation was predominantly foliage growth (57 % in grass and 78 % in willow). Shallow soil water age under grass was estimated to be similar to under willows (15–17 d). Considering potential xylem transit times showed a substantial improvement in the model's capability to simulate xylem isotopic composition and water ages and demonstrates the potential value of using in situ data to aid ecohydrological modelling. Root water uptake was predominately derived from summer precipitation events (56 %) and had an average age of 35 d, with xylem transport times taking at least 6.2–8.1 d. By evaluating isotope mass balances along with water partitioning, energy budgets, and biomass allocation, the EcH2O-iso model proved a useful tool for assessing water cycling within the critical zone at high temporal resolution, particularly xylem water sources and transport, which are all necessary for short- and long-term assessment of water availability for plant growth. |
نوع الوثيقة: | article |
وصف الملف: | electronic resource |
اللغة: | English |
تدمد: | 1726-4170 1726-4189 |
Relation: | https://bg.copernicus.org/articles/19/2465/2022/bg-19-2465-2022.pdf; https://doaj.org/toc/1726-4170; https://doaj.org/toc/1726-4189 |
DOI: | 10.5194/bg-19-2465-2022 |
URL الوصول: | https://doaj.org/article/1b87411af093411b98959c165915f28c |
رقم الأكسشن: | edsdoj.1b87411af093411b98959c165915f28c |
قاعدة البيانات: | Directory of Open Access Journals |
تدمد: | 17264170 17264189 |
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DOI: | 10.5194/bg-19-2465-2022 |