人类干扰对若尔盖高原景观格局变化影响的遥感分析

利用1965年至2010年间7期遥感影像数据为信息源,通过目视解译提取若尔盖高原土地覆盖,在GIS空间分析功能支持下,依据景观生态学理论对景观时空格局变化进行分析。研究结果表明:1965～2010年间,研究区人类活动干扰程度呈持续增加的趋势,且对环境变化产生双面效应,即以2000年为时间节点,区域生态环境呈现先恶化后恢复的发展趋势;其中,2010年相对于1965年农田、草地、城镇和荒漠的面积呈增加的趋势,而森林和湿地的面积呈减少的趋势;2000年后湿地面积萎缩速度明显减缓,且荒漠面积也呈减少的趋势。

Response of Landscape Pattern Changes to Human Interference in Zoige Plateau

With the seven groups of remote sensing data collected from 1965 to 2010 as sources of information,land covers were extracted by visual interpretation in Zoige Plateau.Based on the support of GIS spatial analysis function and guidance of landscape ecology theory,the pattern changes in the spatial and temporal scale were analyzed.The results show that: in the study area,the degree of human interference was increased;due to the influence of human activity,the environmental effects were in two stages——taking 2000 as time node,the regional ecological environment development trends got worse and then recovered.The areas of grassland,town and desert increased in 2010,while the area of forests and wetlands showed a decreasing trend.The shrinking speed of wetland significantly slowed down,and the area of desert also showed a decreasing trend after 2000.