Spatial and temporal patterns of soil water storage and vegetation water use in humid northern catchments.
Spatial and temporal patterns of soil water storage and vegetation water use in humid northern catchments.
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DOI：
10.1016/j.scitotenv.2017.03.275
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
J. Geris;D. Tetzlaff;J. McDonnell;C. Soulsby
中科院分区：
文献类型：
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作者：
J. Geris;D. Tetzlaff;J. McDonnell;C. Soulsby
利用稳定同位素数据从土壤和植被木质部样品在一系列的景观位置，这项研究提供了初步的见解土壤-植物水分相互作用的空间格局和时间动态在一个潮湿的，低能量的北方环境。我们的分析表明，蒸发分馏影响土壤水的同位素签名在浅的深度，但不显着比以前在其他环境中观察到的。通过比较田间持水量附近和田间持水量之下的土壤水中稳定同位素的时间动态，我们发现这些沃茨并没有明显的分离。该研究推断，所有地点的植被水源相对恒定，最有可能在靠近土壤/大气界面的上层。数据分析还表明，植被类型和景观位置，包括土壤类型，可能有很大的影响当地的吸水模式，虽然需要更多的工作，明确确定水源和了解植物生理过程对木质部同位素水签名的影响。
Using stable isotope data from soil and vegetation xylem samples across a range of landscape positions, this study provides preliminary insights into spatial patterns and temporal dynamics of soil-plant water interactions in a humid, low-energy northern environment. Our analysis showed that evaporative fractionation affected the isotopic signatures in soil water at shallow depths but was less marked than previously observed in other environments. By comparing the temporal dynamics of stable isotopes in soil water mainly held at suctions around and below field capacity, we found that these waters are not clearly separated. The study inferred that vegetation water sources at all sites were relatively constant, and most likely to be in the upper profile close to the soil/atmosphere interface. The data analyses also suggested that both vegetation type and landscape position, including soil type, may have a strong influence on local water uptake patterns, although more work is needed to explicitly identify water sources and understand the effect of plant physiological processes on xylem isotopic water signatures.