1986年以来6个时期杭州湾及其周边区域滨海养殖用地的分布及其变化

Distribution and Changes of Coastal Aquaculture Lands in Hangzhou Bay and Its Surrounding Areas for 6 Periods Since 1986

开展杭州湾及其周边区域滨海养殖用地遥感监测工作,对该区域滨海用地的规划、管理以及滨海湿地资源和生态环境保护具有重要意义。利用1986年、1990年、2000年、2010年、2015年和2020年的Landsat TM/ETM+/OLI影像数据,采用面向对象的决策树分类方法以及土地利用动态度模型和质心迁移模型,提取出杭州湾滨海养殖用地的空间分布信息,研究了6个时期杭州湾滨海养殖用地面积、分布及其变化特征。研究结果表明,1986年和1990年,研究区的滨海养殖用地主要分布在杭州湾北部和杭州湾河口南部;2000年,研究区滨海养殖用地集中分布于杭州湾河口南部;2010年、2015年和2020年,研究区滨海养殖用地集中分布于杭州湾南部;6个时期,研究区滨海养殖用地的重心逐渐向南部迁移;前5个时期,研究区滨海养殖用地面积不断增大,于2015年达到最大,为650.74 km^(2),2020年,其面积有所减小;随着时间的推移,相邻时期间的土地利用动态度总体上在不断减小,研究区滨海养殖用地变化的幅度和速率都逐渐减小。

Remote sensing monitoring of the coastal aquaculture lands in Hangzhou Bay and its surrounding areas is of great significance to the planning and management of the coastal lands in this area,as well as the protection resources of the coastal wetlands and ecological environment.The spatial distribution information of the coastal aquaculture lands in the study area was extracted from long-term series of Landsat TM/ETM+/OLI images in 1986,1990,2000,2010,2015 and 2020,respectively using the object-based decision tree classification method.The area,distribution and change characteristics of the coastal aquaculture lands in the study area for 6 periods were analyzed by land use dynamics model and centroid migration model.The results showed that,the coastal aquaculture lands in the study area were mainly distributed in the north of Hangzhou Bay and the south of Hangzhou Bay estuary in 1986 and 1990,and were concentrated in the south of Hangzhou Bay estuary in 2000,and were mainly located in the south of Hangzhou Bay in 2010,2015 and 2020,the spatial distribution center of the coastal aquaculture lands in the study area gradually shifted to the south during 6 periods.In 1986,1990,2000,2010 and 2015,the areas of the coastal aquaculture lands in the study area continued to increase,and reached the maximum(650.74 km^(2))in 2015,then,the area of the coastal aquaculture lands decreased in 2020.The dynamic degree of land use between adjacent periods decreased on the whole,the change range and rate of the coastal aquaculture lands in the study area gradually decreased.