长江口不同区段围垦区土地利用/覆被变化的时空动态

Spatiotemporal dynamics of land use and land cover changes in different reclamation zones of Yangtze Estuary

基于1987、1995、2000和2006年长江口TM、ETM遥感影像,利用RS、GIS与数学统计方法,对长江口不同围垦区土地利用动态进行了分析.结果表明:研究期间,不同围垦区草地面积所占比例在空间上的差异达显著水平(P<0.05),大棚用地和水田面积所占比例在时间序列上的差异达显著水平(P<0.05);去除围垦时间的因素,不同围垦区土地利用多样性指数的变化无显著性差异;土地利用年变化速率在空间上差异不显著,在时间上具有显著差异的土地类型为大棚用地和建筑用地;不同围垦区的土地利用程度具有一致性,土地利用转移方向的差异也不显著,转移强度相似.长江口不同围垦区的土地利用动态主要受围垦时间的影响.

Based on the TM and ETM remotely sensed images of Yangtze Estuary in 1987,1995,2000,and 2006,and by using RS,GIS,and mathematical statistical methods,this paper analyzed the dynamic changes of land use and land cover in different reclamation zones of the estuary.In terms of relative area occupied by each land use type,grassland showed significant spatial differences（P〈0.05）among the reclamation zones,while greenhouse land and paddy field showed significant temporal differences（P〈0.05）.After eliminating the factor reclamation time,there was no significant difference in the land use diversity index among the reclamation zones.In terms of land use change rates,no significant spatial difference was observed among the reclamation zones,while greenhouse land and built-up area showed significant temporal differences.In terms of land use intensity and transformation direction,different reclamation zones had no significant differences.The land use dynamic changes in different reclamation zones of the estuary were mainly affected by reclamation time.