1985-2014年漓江流域景观格局动态变化研究

Study on dynamic changes of land use and landscape pattern in Lijiang river basin from 1985 to 2014

文章以漓江流域为研究对象,应用1985年、2000年和2014年3期遥感影像,提取土地利用数据,采用土地利用动态度、土地利用转移矩阵等方法,分析1985-2014年漓江流域土地利用的演变趋势;结合Fragstats4.2景观分析工具,识别了该流域景观格局的动态变化。结果表明:1985-2014年,漓江流域土地利用整体变化幅度不大,主要表现为林地、耕地和草地面积减小,湿地、居民及城乡建设用地和未利用土地面积增加,且变化集中发生在2000-2014年。同时景观水平上破碎化和复杂化程度加剧,聚集程度和斑块连续程度有待提高;类型水平上林地景观破碎化层度增加,耕地和草地斑块面积增加,湿地和居民及城乡建设用地的聚集度较高,分布集中。

This paper analyzes the change trends of land use in Lijing river basin from 1985 to 2014 using three periods of remote sensing data of 1985, 2000 and 2014 and the methods of dynamic degree of land use and the method of land use transfer matrix.The dynamic changes of the landscape pattern are identified by the Fragstats4.2 landscape analysis tool. The results show that the overall change of land use in this region is not large in 1985-2014, mainly exhibiting decreases of woodland, cultivated land and grassland area, and the increase of wetland, urban and rural construction land and unused land area, of which the changes concentrated in 2000-2014. Meanwhile, the degree of fragmentation and complexity increased on a landscape scale, and the degree of aggregation and patch continuity need to be improved. Besides, at the level of type, the fragmentation of woodland landscape increased, and the area of cultivated land and grassland patches increased, and the clustering of wetland, residents and urban and rural construction land was relatively high showing a concentrating distribution.