基于面积转移矩阵的龙川江流域土地利用变化研究

Research on land use change in Longchuan River Basin based on transfer matrix

长时期的土地利用变化研究有利于提高对土地利用和土地覆被变化动态过程的认识。基于1982年和2016年龙川江流域遥感影像及地理信息软件,将该流域土地利用类型主要分成9类,即暖温性针叶林、常绿阔叶林、人工林、暖温性石灰岩灌丛、干热河谷稀树灌木草丛、水田、旱地、水域和居民区。基于Arcmap10. 1软件的分类统计功能,从土地利用类型的面积变化、时空动态变化、动态度变化以及面积转移矩阵四个方面对研究区土地利用变化进行了分析。结果表明:研究区土地利用类型主要以暖温性针叶林、常绿阔叶林、暖温性石灰岩灌丛、干热河谷稀树灌木草丛为主。1982～2016年,暖温性针叶林、暖温性石灰岩灌丛以及旱地面积呈下降趋势,面积减少最多的是暖温性针叶林;常绿阔叶林、人工林、干热河谷稀树灌木草丛、水田、水域和居民区面积呈增加趋势,但是水域面积增加不多。动态度最大的是人工林,其变化幅度也是最大,面积大幅增加;干热河谷稀树灌木草丛和水域的动态度最小,其增幅也不大。研究成果对该流域水土保持工作的开展具有一定参考价值。

The study on long-term land use change can improve the understanding of the dynamic process of land use and land cover change.According to the remote sensing images and geographic information of Longchuan River basin obtained in 1982 and 2016,the land use types are categorized into nine groups:warm coniferous forest,ever-green broad-leaved forest,artificial forest,warm limestone thickets,dry grassy valley shrub grass,paddy field,dry land,water area and residential area.Based on the classification and statistical functions of Arcmap 10.1 software,land use change in the study area are analyzed from four aspects,i.e.change in the land use area,dynamic change in time and space,dynamic altitude change,transferring matrix model.The results show that the land use types in the study area include warm coniferous forest,ever-green broad-leaved forest,warm limestone thickets and dry grassy valley shrub grass.From 1982 to 2016,the areas of warm coniferous forest,warm limestone thickets and dry land are in a declining trend while the area of warm limestone forest decreases the least.The areas of ever-green broad-leaved forest,artificial forest,dry grassy valley shrub grass,paddy field,water area,residential area are increasing,and water area is growing at a slower pace.Land type with the highest change amplitude and the largest variation is artificial forest whose area has increased significantly.Dry grassy valley shrub grass and water area are the two land types that have the least change amplitude and limited growth in areas.