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	Response of Populus euphratica Oliv. sap flow to environmental variables for a desert riparian forest in the Heihe River Basin, Northwest China
	Li Wei1,2,3; Si Jianhua2; Yu Tengfei2; Li Xiaoyan1
刊名	JOURNAL OF ARID LAND
	2016-08-01
卷号	8期号:4页码:591-603
关键词	sap flow solar radiation vapor pressure deficit Jarvis-Stewart model hysteresis
ISSN号	1674-6767
DOI	10.1007/s40333-016-0045-4
通讯作者	Si Jianhua(jianhuas@lzb.ac.cn)
英文摘要	Being an important desert riparian forest in the lower reaches of the Heihe River Basin, Populus euphratica Oliv. forest functions as a natural barrier in maintaining and preserving the stability of local oases. Accordingly, accurately estimating the water use of P. euphratica is important for vegetation protection and water resource allocation. To date, little data are available for evaluating the hysteretic effects between sap flow and environmental variables, and for estimating the water use of desert riparian forest. In this study, we measured the sap flow velocity (V-s ) of P. euphratica using the heat ratio method during the growing season of 2012. Based on the response of V-s to solar radiation (R-s ) and vapor pressure deficit (VPD), we estimated the hourly V-s and daily V-s using the multivariable linear regression and a modified Jarvis-Stewart (JS) model, respectively. Hysteretic response of R-s to environmental variables was then evaluated using a sap flow model. We found the thresholds of R-s responses to R-s and VPD at both hourly and daily scales during the growing season, and successfully estimated the seasonal variations of hourly R-s and daily R-s using the JS model. At an hourly scale, the maximum R-s occurred earlier than the maximum VPD by approximately 0.5 h but later than the maximum R-s by approximate 1.0 h. At a daily scale, the maximum R-s lagged behind the maximum VPD by approximately 2.5 h while occurred earlier than the maximum R-s by approximately 2 h. However, hysteretic response of V-s was weakened when R-s and VPD were measured together using the JS model at both hourly and daily scales. Consequently, short-term and intensive field campaigns, where V-s and environmental variables can be measured, may be used to estimate short-run sap flow and stand transpiration using only two environmental variables.
收录类别	SCI
WOS关键词	FLUX-SCALED TRANSPIRATION ; VAPOR-PRESSURE DEFICIT ; WHOLE-TREE TRANSPIRATION ; WATER-USE ; CANOPY CONDUCTANCE ; THERMAL DISSIPATION ; EUCALYPTUS-GLOBULUS ; JAPANESE CEDAR ; ARID REGION ; SOIL-WATER
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000375449800010
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557319
专题	寒区旱区环境与工程研究所
通讯作者	Si Jianhua
作者单位	1.Beijing Normal Univ, Coll Resources Sci & Technol, Beijing 100875, Peoples R China 2.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China 3.Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Li Wei,Si Jianhua,Yu Tengfei,et al. Response of Populus euphratica Oliv. sap flow to environmental variables for a desert riparian forest in the Heihe River Basin, Northwest China[J]. JOURNAL OF ARID LAND,2016,8(4):591-603.
APA	Li Wei,Si Jianhua,Yu Tengfei,&Li Xiaoyan.(2016).Response of Populus euphratica Oliv. sap flow to environmental variables for a desert riparian forest in the Heihe River Basin, Northwest China.JOURNAL OF ARID LAND,8(4),591-603.
MLA	Li Wei,et al."Response of Populus euphratica Oliv. sap flow to environmental variables for a desert riparian forest in the Heihe River Basin, Northwest China".JOURNAL OF ARID LAND 8.4(2016):591-603.

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