GIS支持下的江河源区土地覆盖遥感监测

Study on land cover dynamic change in the resource area of Yangtze River and Yellow River using GIS and RS

利用1986年TM和2000年ETM卫星遥感数据,在GIS的支持下对江河源区土地覆盖变化进行了监测,14年来该区草地、林地等地表自然植被面积减少,湖泊、湿地萎缩,沙地、裸地面积扩张,荒漠化程度加剧;气候变异引起冻土退化,叠加上不合理的人类活动,是导致研究区土地覆盖变化的主要原因。

The authors monitored dynamic changes of land cover in the source region of the Yangtze and Yellow Rivers by using 1986 TM and 2000 ETM datum based RS and GIS technology. The result show that prominent changes have taken place in the past 14 years. The land used for urban and rural residence has been increasing rapidly, and the grassland has been reduced and increasingly changed into unused land. It is also shown that wetland, the forest land and the comprehensive land use index has been decreasing obviously, indicating that the desertification have become stronger. The main driving forces lead to these changes are abnormal climate and irrational human being activity.