干旱区生态环境知识资源中心(Arid): Alteration in isotopic composition of gross rainfall as it is being partitioned into throughfall and stemflow by xerophytic shrub canopies within water-limited arid desert ecosystems

Arid

DOI	10.1016/j.scitotenv.2019.07.294
	Alteration in isotopic composition of gross rainfall as it is being partitioned into throughfall and stemflow by xerophytic shrub canopies within water-limited arid desert ecosystems
	Zhang, Ya-feng; Wang, Xin-ping; Pan, Yan-xia; Hu, Rui
通讯作者	Zhang, Ya-feng
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	692 页码:631-639
英文摘要	Isotopic composition of gross rainfall has been extensively used as a conservative tracer to track water movement and other hydrological processes in vegetated ecosystems. Recent studies from forest ecosystems, however, demonstrated that vegetation canopies can alter the isotopic composition of rainwater during rainfall partitioning into throughfall and stemflow, likely leading to errors and biases in aforementioned studies. No known studies, to date, had investigated this topic in shrub-dominated arid and semi-arid ecosystems where water is typically the driving factor in ecological, hydrological and biogeochemical processes. In this study, event-based gross rainfall, the throughfall and stemflow induced by shrubs of Caragana korshinskii were measured and samples were collected within a water-limited arid desert ecosystem of northern China, and their water stable isotopes (O-18 and H-2) were also analyzed in the laboratory. We mainly aimed to investigate whether there is an isotopic enrichment or depletion in stemflow and throughfall in comparison to gross rainfall, and to evaluate the possible underlying mechanisms. Our results indicated an enrichment of both isotopes in stemflow, while a general more depletion in throughfall than in gross rainfall, which is presumably affected by a combinative effects of canopy evaporation, isotopic exchange, and selective canopy storage. Deuterium excess of stemflow were found to be significantly higher (P< 0.05) than that of gross rainfall and throughfall. Moreover, we detected the pronounced amount effect, with a significant (P< 0.05) negative relationship between isotopic composition and the amount of gross rainfall, throughfall, and stemflow, respectively. Our study is expected to contribute to an improved understanding of physical processes and water routing in shrub canopies within vast arid desert ecosystems. (C) 2019 Elsevier B.V. All rights reserved.
英文关键词	Isotopic composition Gross rainfall Stemflow Throughfall Deuterium excess Xerophytic shrubs
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000484994700062
WOS关键词	SPATIAL VARIABILITY ; STABLE-ISOTOPES ; CARAGANA-KORSHINSKII ; FOREST ; EVENT ; INTERCEPTION ; EVAPORATION ; VEGETATION ; HARDWOOD ; HYDROGEN
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2019-11-20
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310944
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Shapotou Desert Res & Expt Stn, 320 Donggang West Rd, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Ya-feng,Wang, Xin-ping,Pan, Yan-xia,et al. Alteration in isotopic composition of gross rainfall as it is being partitioned into throughfall and stemflow by xerophytic shrub canopies within water-limited arid desert ecosystems[J],2019,692:631-639.
APA	Zhang, Ya-feng,Wang, Xin-ping,Pan, Yan-xia,&Hu, Rui.(2019).Alteration in isotopic composition of gross rainfall as it is being partitioned into throughfall and stemflow by xerophytic shrub canopies within water-limited arid desert ecosystems.SCIENCE OF THE TOTAL ENVIRONMENT,692,631-639.
MLA	Zhang, Ya-feng,et al."Alteration in isotopic composition of gross rainfall as it is being partitioned into throughfall and stemflow by xerophytic shrub canopies within water-limited arid desert ecosystems".SCIENCE OF THE TOTAL ENVIRONMENT 692(2019):631-639.