天目湖流域土地利用的动态变化及其景观响应

采用遥感、地理信息系统及景观分析的方法研究了天目湖流域1984年、1995年、2000年、2004年4个时段土地利用/覆盖变化及其景观响应。结果表明:20年来天目湖流域土地利用变化的阶段特征明显,2000~2004年这一时段的土地利用变化最为剧烈,共有14.75%的土地类型发生了变化,年均变化率为3.68%,且近期开发的空间范围广、强度大;各种景观指数对土地利用/土地覆盖变化呈明显的时空响应;迎湖地区景观格局指数的变化最为剧烈,背湖地区较为平缓;入湖河流流域的景观指数空间分异较为明显,下游地区变化较大,而其上游相对较小;土地利用变化剧烈的时段与近几年水质恶化的趋势相呼应。

Dynamic Change of Land Use and Landscape Response in the Watershed of Tianmu Lake

Taking watershed of Tianmu lake as the study area,using the method of remote sensing,geographical information and landscape ecology,this paper systematically analyzed the dynamic change and landscape response from 1984 to 2004 in the study area.The result indicated that the stage characteristic of land use change was very outstanding in recent 20 years,the stage from 2000 to 2004 was the most striking,14.75% land changed in this period,the average change rate was 3.68%,and the space scope of the land developped was expanding acutely;landscape indices respond to land use change had distinctly spatial and temporal characteristics;landscape indices in the region towards the lake had changed severely than the region deviating the lake;landscape indices in the downstream section of rivers which flow into the lake had changed severely than the upper area;the stage characteristic of land use change was consistent with the trend of water quality deteriorating.