干旱区生态环境知识资源中心(Arid): Stable oxygen-hydrogen isotopes reveal water use strategies of Tamarix taklamakanensis in the Taklimakan Desert, China

Arid

	Stable oxygen-hydrogen isotopes reveal water use strategies of Tamarix taklamakanensis in the Taklimakan Desert, China
	Dong Zhengwu; Li Shengyu; Zhao Ying; Lei Jiaqiang; Wang Yongdong; Li Congjuan
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2020
卷号	12 期号:1 页码:115-129
英文摘要	Tamarix taklamakanensis, a dominant species in the Taklimakan Desert of China, plays a crucial role in stabilizing sand dunes and maintaining regional ecosystem stability. This study aimed to determine the water use strategies of T. taklamakanensis in the Taklimakan Desert under a falling groundwater depth. Four typical T. taklamakanensis nabkha habitats (sandy desert of Tazhong site, saline desert-alluvial plain of Qiemo site, desert-oasis ecotone of Qira site and desert-oasis ecotone of Aral site) were selected with different climate, soil, groundwater and plant cover conditions. Stable isotope values of hydrogen and oxygen were measured for plant xylem water, soil water (soil depths within 0-500 cm), snowmelt water and groundwater in the different habitats. Four potential water sources for T. taklamakanensis, defined as shallow, middle and deep soil water, as well as groundwater, were investigated using a Bayesian isotope mixing model. It was found that groundwater in the Taklimakan Desert was not completely recharged by precipitation, but through the river runoff from snowmelt water in the nearby mountain ranges. The surface soil water content was quickly depleted by strong evaporation, groundwater depth was relatively shallow and the height of T. taklamakanensis nabkha was relatively low, thus T. taklamakanensis primarily utilized the middle (23%1%) and deep (31%5%) soil water and groundwater (36%2%) within the sandy desert habitat. T. taklamakanensis mainly used the deep soil water (55%4%) and a small amount of groundwater (25%2%) within the saline desert-alluvial plain habitat, where the soil water content was relatively high and the groundwater depth was shallow. In contrast, within the desert-oasis ecotone in the Qira and Aral sites, T. taklamakanensis primarily utilized the deep soil water (35%1% and 38%2%, respectively) and may also use groundwater because the height of T. taklamakanensis nabkha was relatively high in these habitats and the soil water content was relatively low, which is associated with the reduced groundwater depth due to excessive water resource exploitation and utilization by surrounding cities. Consequently, T. taklamakanensis showed distinct water use strategies among the different habitats and primarily depended on the relatively stable water sources (deep soil water and groundwater), reflecting its adaptations to the different habitats in the arid desert environment. These findings improve our understanding on determining the water sources and water use strategies of T. taklamakanensis in the Taklimakan Desert.
英文关键词	Tamarix taklamakanensis water use strategies stable isotopes Bayesian isotope mixing model deep soil water groundwater Taklimakan Desert
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6663124
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336252
作者单位	Dong Zhengwu, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences;;College of Resources and Environment Science, Xinjiang University;;College of Life Science, Xinjiang Normal University;;University of Chinese Academy of Sciences, ;;;;;;, Urumqi;;Urumqi;;Urumqi;;, ;;;;;;Beijing 830011;;830046;;830054;;100049.; Li Shengyu, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China.; Lei Jiaqiang, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China.; Wang Yongdong, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China.; Li Congjuan, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China.; Zhao Ying, College of Resources and Environmental Engineering, Ludong University, Yantai, Shandong 264025, China.
推荐引用方式 GB/T 7714	Dong Zhengwu,Li Shengyu,Zhao Ying,et al. Stable oxygen-hydrogen isotopes reveal water use strategies of Tamarix taklamakanensis in the Taklimakan Desert, China[J],2020,12(1):115-129.
APA	Dong Zhengwu,Li Shengyu,Zhao Ying,Lei Jiaqiang,Wang Yongdong,&Li Congjuan.(2020).Stable oxygen-hydrogen isotopes reveal water use strategies of Tamarix taklamakanensis in the Taklimakan Desert, China.Journal of Arid Land,12(1),115-129.
MLA	Dong Zhengwu,et al."Stable oxygen-hydrogen isotopes reveal water use strategies of Tamarix taklamakanensis in the Taklimakan Desert, China".Journal of Arid Land 12.1(2020):115-129.