湟水流域土地利用与覆盖动态变化分析

Dynamic Analysis of Land Use and Cover Change in Huangshui Basin

应用湟水流域1985、1995和2000年3个时期的土地利用与覆盖矢量数据,分别从土地利用一、二级分类角度分析了1985~2000年间湟水流域土地利用与覆盖动态变化。结果表明,湟水流域土地利用类型（一级分类）主要以草地为主,占流域总面积的比例稳定在55%以上。在二级分类的层次上,灌木林、中覆盖草地和旱作丘陵耕地分别在林地、草地和农田中占主导地位,占总面积的比例分别在11%、25%和9%以上。此外,土地利用动态度的分析表明,农田和草地在湟水流域具有较高的稳定性,工矿用地和居民地的变化较大,说明该地区近20年来城镇化进程呈增加的趋势。

Based on vector data of 1985, 1995, and 2000, land use and cover dynamic change has been studied in Huangshui basin under first and second classification levels. Results showed that grassland was dominant type in the first classification level and area percentage reach to more than 55% of Huangshui basin during study period. In the second classification level, shrub woodland, the moderate coverage grassland, and rain- feeding hilly cropland had the highest values and area percentages were more than 11% , 25% , and 9% in woodland, grassland, and cropland categories, respectively. In addition, analysis of land use dynamic degree showed that cropland and grassland had the highest stability, industrial and residential land changed significantly in Huangshui basin, which indicates that urbanization process has been increasing trend in recent decades.