干旱区生态环境知识资源中心(Arid): Responses of two desert riparian species to fluctuating groundwater depths in hyperarid areas of Northwest China

Arid

DOI	10.1002/eco.2078
	Responses of two desert riparian species to fluctuating groundwater depths in hyperarid areas of Northwest China
	Li, Engui 1,2; Tong, Yaqin 1,2; Huang, Yongmei 1,2; Li, Xiaoyan 1,2; Wang, Pei 1,2; Chen, Huiying 1,2; Yang, Chongyao 1,2
通讯作者	Huang, Yongmei
来源期刊	ECOHYDROLOGY
ISSN	1936-0584
EISSN	1936-0592
出版年	2019
卷号	12 期号:3
英文摘要	In the hyperarid region of Northwest China, frequent variations in hydrological environments present challenges to the persistence of riparian plants. The main objective of this study was to determine whether two desert riparian species (Populus euphratica and Tamarix ramosissima) differed in their water uptake patterns and ecophysiological responses to fluctuating groundwater depths (GWDs). This study was conducted in typical desert riparian ecosystems in the downstream Heihe River basin, Northwestern China, where the GWD continuously increases during growing season. Stable oxygen composition (delta O-18) in xylem water, soil water, and groundwater, as well as leaf water potential and gas exchange were monitored. Results showed that P. euphratica used a higher ratio of soil water, whereas T. ramosissima relied more on groundwater and deep soil water. As the GWD increased during the growing season, both species modified their water use patterns, but they did so differently, P. euphratica extracted an increasing proportion of deep soil water and groundwater, whereas T. ramosissima took an increasing ratio of groundwater at critical growth stages. P. euphratica exhibited decreases in its daily maximum photosynthetic rate (A(max)) and stomatal conductance (g(max)) as the GWD increased, whereas those of T. ramosissima changed little. In summary, both species shift to use greater ratio of more reliable water sources with the increasing GWD, but the switching of water sources could not sufficiently compensate for the impact of drought stress on gas exchange for P. euphratica.
英文关键词	desert riparian species downstream Heihe River basin gas exchange groundwater depth stable oxygen isotopes water sources
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000462937800009
WOS关键词	HEIHE RIVER-BASIN ; SAN-PEDRO RIVER ; WATER-UPTAKE ; TAMARIX-RAMOSISSIMA ; POPULUS-EUPHRATICA ; LOWER REACHES ; SOIL-WATER ; PLANT ; TREES ; VEGETATION
WOS类目	Ecology ; Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215133
作者单位	1.Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing, Peoples R China; 2.Beijing Normal Univ, Sch Nat Resources, Fac Geog Sci, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Li, Engui,Tong, Yaqin,Huang, Yongmei,et al. Responses of two desert riparian species to fluctuating groundwater depths in hyperarid areas of Northwest China[J]. 北京师范大学,2019,12(3).
APA	Li, Engui.,Tong, Yaqin.,Huang, Yongmei.,Li, Xiaoyan.,Wang, Pei.,...&Yang, Chongyao.(2019).Responses of two desert riparian species to fluctuating groundwater depths in hyperarid areas of Northwest China.ECOHYDROLOGY,12(3).
MLA	Li, Engui,et al."Responses of two desert riparian species to fluctuating groundwater depths in hyperarid areas of Northwest China".ECOHYDROLOGY 12.3(2019).