Insights into the isotopic mismatch between bulk soil water and Salix matsudana Koidz trunk water from root water stable isotope measurements

doi:10.5194/hess-25-3975-2021

	Insights into the isotopic mismatch between bulk soil water and Salix matsudana Koidz trunk water from root water stable isotope measurements
	Zhao, Ying 1,2; Wang, Li 2,3
刊名	HYDROLOGY AND EARTH SYSTEM SCIENCES
	2021-07-08
卷号	25 期号:7 页码:3975-3989
ISSN号	1027-5606
DOI	10.5194/hess-25-3975-2021
通讯作者	Wang, Li(wangli5208@nwsuaf.edu.cn)
英文摘要	Increasing numbers of field studies have detected isotopic mismatches between plant trunk water and its potential sources. However, the cause of these isotopic offsets is not clear, and it is uncertain whether they occur during root water uptake or during water transmission from root to trunk. Thus, we measured the specific isotopic composition (delta H-2 and delta O-18) of each component (e.g. bulk soil water, mobile water, groundwater, trunk water and root water of Salix matsudana Koidz trees) in the soil-root-trunk continuum with a resolution of about 3 days. We report three main findings. First, we detected a clear separation between the isotopic compositions of mobile water and bulk soil water, but the distinction between mobile water and bulk soil water gradually decreased with increasing soil depth. Second, root water composition deviated from bulk soil water isotopic composition but overlapped with the composition derived for less mobile water. The maximum differences in delta H-2 and delta O-18 between bulk soil water and root water were -8.6 parts per thousand and -1.8 parts per thousand, respectively. Third, trunk water was only isotopically similar to root water at 100-160 cm depths, and it remained stable during the experimental period, suggesting that the trees consistently used the stable deep water source. In conclusion, the isotopic offset between bulk soil water and trunk water of S. matsudana reflected an isotopic mismatch between root water and bulk soil water associated with the heterogeneity of the soil water. Our results illuminate relationships between the isotopic compositions of soil waters of various mobilities, root water and trunk water that may be useful for advancing our understanding of root water uptake and transport.
资助项目	National Natural Science Foundation of China[41771545] ; National Natural Science Foundation of China[41977012] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB40000000] ; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS[SKLLQG1718]
WOS关键词	NORTHERN LOESS PLATEAU ; PLANT WATER ; LIUDAOGOU CATCHMENT ; HYDROGEN ; PRECIPITATION ; FRACTIONATION ; OPPORTUNITIES ; PERSPECTIVES ; MECHANISMS ; PATTERNS
WOS研究方向	Geology ; Water Resources
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000672247500002
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/163853]
专题	中国科学院地理科学与资源研究所
通讯作者	Wang, Li
作者单位	1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 3.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Ying,Wang, Li. Insights into the isotopic mismatch between bulk soil water and Salix matsudana Koidz trunk water from root water stable isotope measurements[J]. HYDROLOGY AND EARTH SYSTEM SCIENCES,2021,25(7):3975-3989.
APA	Zhao, Ying,&Wang, Li.(2021).Insights into the isotopic mismatch between bulk soil water and Salix matsudana Koidz trunk water from root water stable isotope measurements.HYDROLOGY AND EARTH SYSTEM SCIENCES,25(7),3975-3989.
MLA	Zhao, Ying,et al."Insights into the isotopic mismatch between bulk soil water and Salix matsudana Koidz trunk water from root water stable isotope measurements".HYDROLOGY AND EARTH SYSTEM SCIENCES 25.7(2021):3975-3989.