Numerical modeling the isotopic composition of evapotranspiration in an arid artificial oasis cropland ecosystem with high-frequency water vapor isotope measurement

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• 作者：Pei Wang^a ; ^b ; ^c ; ^{peiwang@bnu.edu.cn} ; Xiao-Yan Li^a ; ^b ; ^c ; Yongmei Huang^a ; ^b ; ^c ; Shaomin Liu^d ; Ziwei Xu^d ; Xiuchen Wu^a ; ^b ; ^c ; Yu-Jun Ma^a ; ^b ; ^c
• 关键词：Evapotranspiration ; Isotopic tracer ; Numerical modelling ; Steady state assumption ; Arid oasis ecosystem
• 刊名：Agricultural and Forest Meteorology
• 出版年：2016
• 出版时间：15 December 2016
• 年：2016
• 卷：230-231
• 期：Complete
• 页码：79-88
• 全文大小：2200 K
• 卷排序：230

文摘

Integrating the isotopic fractionation processes with separate E and T for simulating dynamics (δET and δL,b). In situ measurements of isotopic water vapor with the flux-gradient approach and robust EC data were used to evaluate daily and seasonal variations of Iso-SPAC model output. The steady-state assumption is a better approximation for estimating δL,b and δT in the daytime over the growing season. Consideration of the extra resistance of bare soil from film coverage is necessary for estimating E, and 5 cm is a reasonable depth for soil water sampling for estimating δE.