川西北高原若尔盖草地沙化及湿地萎缩动态遥感监测

应用卫星遥感资料(MSS、TM及spot)对川西北高原若尔盖草地沙化及湿地萎缩的动态监测发现，自1966年至2000年的34年间，草地沙化面积增加307．7％，达到36760．9hm^2，占区域总面积的7．25％，平均每年扩大草地沙化面积816．0hm^2，年均递增率达4．22％。到2000年止，区域内有沙地5083．9hm^2，沙化草地31677．0hm^2。自1985～2000年的15a间，区内17个湖泊面积缩小842．0hm^2，减幅达38．9％，平均每年减少56．1hm^2，年均递减速度达3．34％，该区目前其余11个湖泊总面积仅为1323．1hm^2，只有15年前的61．1％。

Monitoring on Desertification Trends of the Grassland and Shrinking of the Wetland in Ruoergai Plateau in North-west Sichuan by Means of Remote-sensing

The monitoring on desertification trend of the grassland and shrinking of the wetland in Ruoergai plateau by means of remote-sensing (MSS,TM and Spot) indicated ,from 1966 to 2000,the grassland area of desertification increase 307.7%,increase to 36 760.9 hm~2.It is 7.25% of the total area .The grassland area of desertification increase 816.0 hm~2 per year,the proportion of desertification grassland increase 4.22% pro year.To 2000,there is 5 083.9 hm~2 sandlot ,31 677.0 hm~2 grassland in the region .From 1985 to 2000,the area of lake in the region decrease 842.0 hm~2,the proportion of decrease is 38.9%,56.13 hm~2 pro year ,3.34% per year .The currently area of lake is 1 323.1 hm~2,it is only 61.1% of before 15 years .