基于CBERS-1卫星图像的塔里木河下游典型区域景观格局分析

基于遥感、地理信息系统和景观生态学研究方法,以塔里木河下游典型区域为研究对象,对塔里木河下游典型区域CBERS-1遥感图像进行目视判读,获取研究区2001年8月、2005年8月2期矢量数据,选取景观多样性指数、景观优势度指数、景观均匀度指数、景观斑块密度、景观廊道密度指数等景观生态指标,对所用指标综合分析,结果表明:1)2001年8月-2005年8月景观类型构成没有发生变化,而且都是以灌丛、低覆盖度草地和荒地占绝对优势,但在研究区内所占比例不同;2)农田面积、斑块数大幅上升,导致草地等景观类型面积下降;3)研究区内除了草地、低覆盖度草地、荒地、沼泽、水域面积减少以外,其他景观类型面积都有不同程度的增加,水域面积减少的原因是水域由大的斑块状改变成线状或带状,但是景观总的连接性还是很差.

Analysis of landscape pattern based on CBERS-1 Satellite images in typical middle reaches of the Tarim River

Based on the methods of remote sensing,geographical information system and ecological landscape,the typical middle reaches of the Tarim River was selected as the target area to study the landscape pattern through visual interpretation of CBERS-1 remote sensing data in August 2001 and August 2005 and the diversity index,dominance index,evenness index,patch density index and corridor density index were used for analysis.The results shown that: 1) there was no change of landscape pattern structure and the main matrix structure were shrub,low coverage grassland and wasteland in 2001,it was the same in 2005,but their proportion was different.2) The area and patch numbers of farmland area increased fast and it resulted in the reduction of some landscape types,especially the grassland.3) In the target area,the area of many landscape types have raised in a different degree except grassland,low coverage grassland,wasteland and waters.However,the reason of reduction of the waters was that the bigger patches water area changed to linear area or zonal area,and the connection of the general landscape was very poor.