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Differential water use strategies among selected rare and endangered species in West Ordos Desert of China

Journal of Plant Ecology 2017年第4期10卷 660-669页

作者： Jie Chen Qing Xu Deqiang Gao Aiyun Song Yuguang Hao Yingbin Ma Institute of Forest Ecology Environment and Protection Chinese Academy of ForestryNo.1 DongxiaofuXiangshan RoadHaidian DistrictBeijing 100091China Shandong Provincial Key Laboratory of Eco Environmental Science for Yellow River Delta Binzhou UniversityNo.391 Yellow Five RoadBinzhou 256603China Experimental Center of Desert Forestry Chinese Academy of ForestryTuanjie RoadDengkou 015200China

Aims West Ordos Desert(WOD)in Inner Mongolia of China is charac-terized by unique geographical and ecological features to avoid the direct invasion of Quaternary Continental Glaciation,so it hosts many endangered relic species such as Tetraena mongol-ica,Ammopiptanthus mongolicus and Potaninia mongolica from ***,how these plants utilize available water sources remains *** objective of this study was to investigate the water utilization strategies of selected rare and endangered plant species in WOD by comparing hydrogen isotope ratios between their xylem water and possible water sources following four rainfall events of *** We measured the hydrogen isotope ratios of xylem water from ***,*** and *** and an accom-panying species Sarcozygium xanthoxylum and potential water sources(including precipitation and soil water in different soil layers from 0 to 150 cm)over 9 days following each of four varying-intensity rainfall events during the summer of *** then calculated the percentage utilization of potential water sources by each species after each rainfall events using the linear mixing *** also made the measurements of soil moisture and root biomass in favor of interpretation of plant water use *** Findings Tetraena mongolica,*** and *** primarily relied on deep soil water,whereas *** depended predomi-nantly on *** rare and endangered desert plants had differential utilizations of available water sources,so some com-petition for limited water existed among some *** mongolica had a competitive relationship in absorption of soil moisture with the same family species ***,suggesting that *** and *** should be restored separately at different areas in the ***,this study provides a better understanding of water use strategies of these four plants and scien-tific evidence for protecting rare a

关键词： rare species endangered species hydrogen stable isotope water use strategies West Ordos Desert(WOD) varying-intensity rainfall events

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