【摘要】 综合运用RS、GIS及地理统计学的理论、技术,监测干旱区地下水位降幅对天然植被衰退过程的影响。结果表明:研究区内大部分绿洲位于20~30 m降幅之间,并由北向南呈环状递减;天然植被覆盖变化敏感区域居于5~8 m降幅之内,超过10 m降幅将出现严重退化区;天然植被大面积向绿洲东北方向退缩,15年间典型研究区天然植被面积减少近1/2,半固定沙丘面积增大而将成为新的沙尘策源地,绿洲生态环境更为脆弱。更多还原

【Abstract】 By integratively using RS,GIS and Geostatistics,the effects of downrange of the groundwater depth on nature vegetation degeneration in arid area were analyzed.The results showed that:(1)most of oases lied in 20～30 m of the downrange of groundwater depth which were decreased as circus from north to south in study area;(2)there were the sensitive region in 5～8 m and severe decline area over 10 m;(3)distributing region of nature vegetation countermarched from southwest to northeast,and its reduced area was closed to 50% for 15 years,the expanded semi-settled dune will be a new sandy headstream,so the state of local environment will be extremely frail and unsteady.更多还原