【摘要】 为探究陕北风沙滩区地表植被覆盖度和优势种对地下水埋深的响应关系，以陕北风沙滩区2004～2019年地下水监测井数据和遥感影像等资料为基础，分析了地表植被覆盖度和地下水埋深的时空变化特征，提出了地下水埋深对地表植被覆盖度影响较为敏感的范围，以及典型优势种适生的地下水埋深.结果表明：2004～2019年研究区域地表植被覆盖度由中低向中等覆盖度转变，整体呈现由WS向EN递增趋势；研究区域地下水埋深整体呈增加趋势，其中埋深减小区域集中在横山区、榆阳区和神木市，增大区域分布在定边县和靖边县；地表植被覆盖度大多为30%～50%,其中地下水埋深对地表植被覆盖度影响较为敏感的范围为1.5～8.0m;研究区域先锋植物、芨芨草、长芒、大针茅、短花针茅等典型优势种适生的地下水埋深分别为2.12～3.38m、1.53～2.97m、3.14～6.44m、4.58～5.93m和4.76～5.34m.研究结果可用于陕北风沙滩区不同地下水埋深条件下的植被恢复，为其生态环境的健康发展提供依据.更多还原

【Abstract】 To investigate the relationship between fractional vegetation cover of surface and dominant species in response to groundwater depth in the blown-sand region of northern Shaanxi Province, the spatio-temporal variation characteristics of fractional vegetation cover and groundwater depth were analyzed based on the data of groundwater monitoring wells and remote sensing images from 2004 to 2019.The range of groundwater depth that is more sensitive to the influence of fractional vegetation cover, as well as the depth of groundwater in which the typical dominant species are suitable for growing were proposed.The results indicated that the fractional vegetation cover of surface shifted from medium-low to medium cover from 2004 to 2019,with an overall increasing trend from southwest to northeast.The overall trend of groundwater depth in the study area is increasing, with decreasing groundwater depth area mainly concentrated in Hengshan district, Yuyang district and Shenmu city, and increasing groundwater depth area distributed in Dingbian and Jingbian counties.Most of the fractional vegetation cover is mainly in the range from 30% to 50%,in which the sensitive range of groundwater depth to the influence of fractional vegetation cover is 1.5～8.0m.The suitable groundwater depth for the typical dominant species such as Pioneer plant,Achnesis splendens,Longgrass,Stipa grandis,and Stipa breviflora in the study area ranged from 2.12～3.38m, 1.53～2.97m, 3.14～6.44m, 4.58～5.93m, and 4.76～5.34m, respectively.The results can be used for vegetation restoration under different groundwater depth conditions in the blown-sand region of northern Shaanxi Province, and providing basis for the healthy development of its ecological environment.更多还原