干旱区生态环境知识资源中心(Arid): Response of Populus euphratica Oliv. sap flow to environmental variables for a desert riparian forest in the Heihe River Basin, Northwest China

Arid

	Response of Populus euphratica Oliv. sap flow to environmental variables for a desert riparian forest in the Heihe River Basin, Northwest China
	Li Wei; Si Jianhua; Yu Tengfei; Li Xiaoyan
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2016
卷号	8 期号:4 页码:591-603
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 V_s to environmental variables was then evaluated using a sap flow model. We found the thresholds of V_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 V_s and daily V_s using the JS model. At an hourly scale, the maximum V_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 V_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.
英文关键词	sap flow solar radiation vapor pressure deficit Jarvis-Stewart model hysteresis
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Forestry
CSCD记录号	CSCD:5722410
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335662
作者单位	Li Wei, College of Resources Science and Technology, Beijing Normal University, State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing 100875, China.; Li Xiaoyan, College of Resources Science and Technology, Beijing Normal University, State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing 100875, China.; Si Jianhua, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Yu Tengfei, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, 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],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.