沙漠腹地达里雅布依绿洲柽柳幼苗的水分利用来源  

Water sources of Tamarix sp.seedlings at the Daryaboyi oasis in the hinterland of desert

作　　者：麦尔哈巴·尼加提 比拉力·依明 师庆东[1,2] 戴岳[1,2,3] 史浩伯 肖合来提·巴义 MARHABA·Nijat;BILAL·Emin;SHI Qingdong;DAI Yue;SHI Haobo;XIAO HELAITI·Bayi(College of Resource and Environmental Sciences,Xinjiang University,Urumqi 830046;Key Laboratory of Oasis Ecology Ministry of Education,Urumqi 830046;Institute of Arid Ecology and Environment,Xinjiang University,Urumqi 830046;The Sixth Ecological Environment Supervision Office of Xinjiang Uygur Autonomous Region Department of Ecology and Environment,Kashgar 844000,China)

机构地区：[1]新疆大学资源与环境科学学院,乌鲁木齐830046 [2]绿洲生态教育部重点实验室,乌鲁木齐830046 [3]新疆大学干旱生态环境研究所,乌鲁木齐830046 [4]新疆维吾尔自治区生态环境厅第六生态环境监察办,喀什844000

出　　处：《干旱区资源与环境》2021年第8期159-166,共8页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金青年基金项目(31800613);国家自然科学基金新疆联合基金重点项目(U1703237)资助。

摘　　要：水是影响干旱荒漠生态系统植物生存的重要因素之一。本研究运用氧稳定同位素和碳稳定同位素技术,对塔克拉玛干沙漠腹地达里雅布依绿洲不同地下水埋深下柽柳(Tamarix sp.)幼苗的木质部水、各潜在水源的δ^(18)O值及水分利用效率(δ^(13)C值)进行测定。采用IsoSource模型计算了不同地下水埋深下柽柳幼苗对各潜在水源的利用比例,并用平均吸水深度模型分析了柽柳幼苗的吸水深度。结果表明:土壤水是柽柳幼苗的主要水源,随着地下水埋深的增加,柽柳幼苗的吸水深度下移。210cm地下水埋深下柽柳幼苗主要利用0~40cm土壤水,利用比例为80%~86%,平均吸水深度为30.39cm;290cm地下水埋深下柽柳幼苗主要利用120~240cm土壤水,利用比例为56%~90%,平均吸水深度为186.19cm。210cm地下水埋深处柽柳幼苗的叶片δ^(13)C值略低于290cm地下水埋深处柽柳幼苗的叶片δ13C值,分别为-27.86‰和-27.25‰,表明研究区柽柳幼苗的水分利用效率随地下水埋深的增加而略有增加。Water is one of the important factors affecting the plant survival in arid desert ecosystem.In this paper,Tamarix sp.seedlings growing at two sites with different groundwater depths at the Daryaboyi oasis in the hinterland of Taklamakan desert were chosen,and stable oxygen isotopes technology and stable carbon isotopes technology were used to determine water source and water use efficiency of Tamarix sp.seedlings.The oxygen stable isotope radios(δ^(18)O)were measured for xylem water,soil water in different soil layers,and groundwater and the carbon stable isotope radios(δ^(13)C)were measured for leaves of Tamarix sp.seedlings.The IsoSource model was used to calculate the possible ranges of potential water sources used by Tamarix sp.seedlings,while the mean depth of water uptake model was used to determine the main soil layer absorbed by Tamarix sp.seedlings.The results showed that soil water was the main water source for Tamarix sp.seedlings,and the depths of water absorption deepened with declining groundwater depths.Tamarix sp.seedlings at the groundwater depth of 210 cm mainly used shallow soil water(0-40 cm),with possible use ratio of 80%-86%,and its mean water uptake depth was 30.98 cm.Tamarix sp.seedlings at the groundwater depth of 290 cm mainly used middle soil water(40-120 cm),with possible use ratio of 56%-90%,and its mean water uptake depth was 186.98 cm.The δ^(13)C value of leaves for Tamarix sp.seedlings was a bit lower at the groundwater depth of 210 cm than that at the groundwater depth of 290 cm,with the values of-27.86‰ and-27.25‰,respectively,which indicated that water use efficiency of Tamarix sp.seedlings in this study increased with the declining of the groundwater depth.

关 键 词：水分来源 达里雅布依绿洲 柽柳幼苗 地下水埋深 

分 类 号：Q945[生物学—植物学]