Partitioning of evapotranspiration through oxygen isotopic measurements of water pools and fluxes in a temperate grassland

doi:10.1002/2013JG002367

	Partitioning of evapotranspiration through oxygen isotopic measurements of water pools and fluxes in a temperate grassland
	Hu, Zhongmin ; Wen, Xuefa ; Sun, Xiaomin ; Li, Linghao1 ; Yu, Guirui ; Lee, Xuhui 2,3; Li, Shenggong
	2014
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
卷号	119 期号:3 页码:358-371
摘要	Stable isotopic measurements of water provide a promising tool for partitioning of ecosystem evapotranspiration (ET). This approach, however, is still facing some challenges due to the uncertainties in estimating the isotopic compositions of ET and its components. In this study, a tunable diode laser analyzer was deployed for in situ measurements of the oxygen isotopic compositions of water vapor. Using these measurements together with samples of water in plant and soil pools, we partitioned ET via estimating the oxygen isotopic compositions of ET ((ET)) and that of its two components, i.e., plant transpiration ((T)) and soil water evaporation ((E)). A new (T) model was developed in this study, which illustrated consistent estimations with the traditional model. Most of the variables and parameters in the new model can be measured directly with high accuracy, making its potential to be used at other sites high. Our results indicate that the ratio of plant transpiration to evapotranspiration (T/ET) illustrates a U shape diurnal pattern. Mean T/ET at 0630-1830 during the sampling days was 83%. Soil depth of 15 cm is a reasonable depth for soil water sampling for estimating (E) at this site. We also investigated the uncertainties in estimating these three terms and their effects on partitioning. Overall, in terms of partitioning, the uncertainties are relatively small from (T) and (E) but quite large from (ET). Quantifying and improving the precision of (ET) should be a priority in future endeavors of ET partitioning via the stable isotopic approach.
关键词	Evapotranspiration partitioning tunable diode laser oxygen isotope 18O-H2O temperate grassland
学科领域	Environmental Sciences ; Geosciences, Multidisciplinary
DOI	10.1002/2013JG002367
收录类别	SCI
语种	英语
WOS关键词	ECOSYSTEM CARBON EXCHANGE ; STABLE-ISOTOPES ; TERRESTRIAL VEGETATION ; UNCERTAINTY ANALYSIS ; EDDY COVARIANCE ; NONSTEADY STATE ; VAPOR EXCHANGE ; INNER-MONGOLIA ; LEAF WATER ; EVAPORATION
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS记录号	WOS:000334534500013
出版者	AMER GEOPHYSICAL UNION
文献子类	Article
出版地	WASHINGTON
EISSN	2169-8961
资助机构	National Key Research and Development Program [2010CB833501] ; National Natural Science Foundation of China [40971027] ; Ministry of Education of China (grant PCSIRT)
作者邮箱	lisg@igsnrr.ac.cn
引用统计	被引频次：57[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/27184
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Synth Res Ctr Chinese Ecosyst Res Network, Beijing, Peoples R China 2.Chinese Acad Sci, Lab Quantitat Vegetat Ecol, Inst Bot, Beijing, Peoples R China 3.Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA 4.Nanjing Univ Informat Sci & Technol, Yale NUIST Ctr Atmospher Environm, Nanjing, Peoples R China
推荐引用方式 GB/T 7714	Hu, Zhongmin,Wen, Xuefa,Sun, Xiaomin,et al. Partitioning of evapotranspiration through oxygen isotopic measurements of water pools and fluxes in a temperate grassland[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2014,119(3):358-371.
APA	Hu, Zhongmin.,Wen, Xuefa.,Sun, Xiaomin.,Li, Linghao.,Yu, Guirui.,...&Li, Shenggong.(2014).Partitioning of evapotranspiration through oxygen isotopic measurements of water pools and fluxes in a temperate grassland.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,119(3),358-371.
MLA	Hu, Zhongmin,et al."Partitioning of evapotranspiration through oxygen isotopic measurements of water pools and fluxes in a temperate grassland".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 119.3(2014):358-371.

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