文献类型：期刊文献

英文题名：Water use strategy of Ammopiptanthus mongolicus community in a drought year on the Mongolian Plateau

作者：Zhu, Ya-Juan[1] Wang, Guo-Jie[2] Xin, Zhi-Ming[3]

通信作者：Zhu, YJ[1]

机构：[1]Chinese Acad Forestry, Inst Desertificat Studies, Beijing 100091, Peoples R China;[2]Oregon State Univ, Eastern Oregon Univ, Agr Program, La Grande, OR 97850 USA;[3]Chinese Acad Forestry, Expt Ctr Desert Forestry, Dengkou Desert Ecosyst Res Stn, Nei Mongol 015200, Dengkou County, Peoples R China

年份：2020

卷号：13

期号：6

起止页码：793-800

外文期刊名：JOURNAL OF PLANT ECOLOGY

收录：;Scopus(收录号：2-s2.0-85099129498);WOS:【SCI-EXPANDED(收录号:WOS:000606831100009)】；

基金：This research was supported by the Fundamental Research Funds for the Central Non-profit Research Institute of Chinese Academy of Forestry (CAFZC2017M006).

语种：英文

外文关键词：Ammopiptanthus mongolicus; endangered species; groundwater; soil water; stable isotope; water source; water use efficiency

摘要：Aims In desert ecosystems, water is a restricting factor for plant growth and vegetation dynamics. The relatively stable water source from deep soil profile or groundwater is important for plant survival during drought. Understanding water use strategy of endangered species, in desert ecosystem is essential for their conservation and restoration such as Ammopiptanthus mongolicus on the Mongolian Plateau. Methods The stable isotope method of delta D and delta O-18 was used to examine the main water sources of A. mongolicus and two companion shrubs, e.g. Artemisia ordosica and Artemisia xerophytica. The contribution of different water sources to each species was calculated by IsoSource model. Leaf delta C-13 was used to compare long-term water use efficiency of three shrubs. Soil moisture and root distribution of three shrubs was measured to explain plant water use strategy. Important Findings The results showed that A. mongolicus relied on groundwater and 150-200 cm deep soil water, with the former contributing to almost half of its total water source. Artemisia ordosica mainly used 150-200 cm deep soil water, but also used shallow soil water within 100 cm in summer and autumn. Artemisia xerophytica mainly used 150-200 cm deep soil water and groundwater, with the latter contributing to about 30%-60% of its total water source. The three shrubs had dimorphic or deep root systems, which are in accord with their water sources. The WUE in the evergreen shrub A. mongolicus was higher than in two deciduous Artemisia shrubs, which may be an adaptive advantage in desert ecosystem. Therefore, groundwater is an important water source for the endangered shrub A. mongolicus in a drought year on Mongolian Plateau. Ammopiptanthus mongolicus and two Artemisia shrubs competed for deep soil water and groundwater.