کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9476824 1323872 2005 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Soil-moisture limits on plant uptake: An upscaled relationship for water-limited ecosystems
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Soil-moisture limits on plant uptake: An upscaled relationship for water-limited ecosystems
چکیده انگلیسی
Transpiration in water-limited ecosystems is controlled by the availability of soil moisture. Rain events in these natural environments may only partially wet the root zone, leading to a heterogeneous distribution of available water. This spatial variability coupled with the non-linearity of the function relating local uptake to local saturation produces a non-unique relationship when these quantities are scaled up. This work proposes a simple multi-valued relationship between plant transpiration and average root-zone saturation predicated on the distinct spatial patterns of wetting and drying. Predictions of daily transpiration from an upscaled model that uses this relationship match closely those from a vertically resolved model that employs an Ohm's law analogy for plant uptake.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Water Resources - Volume 28, Issue 6, June 2005, Pages 543-552
نویسندگان
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