基于遥感和GIS的四川省草地动态变化分析

利用地理信息系统技术,在空间数据库平台的支持下,对四川省20世纪90年代中期到2000年间的草地动态变化特征、草地动态变化的背景特征及其空间分布特征进行了分析。研究表明,净增草地部分主要来源于耕地,净减草地部分的主要去向是林地。总体上,净增草地面积3812公顷,净增草地部分主要是在轻度土壤侵蚀区、中度土壤侵蚀区、剧烈土壤侵蚀区和强度土壤侵蚀区,坡度等级5、6和1的区域,环境等级5、6、4和1的区域;净减草地部分主要是在微度土壤侵蚀区和极强土壤侵蚀区,坡度等级3、2和4的区域,环境质量等级7和8的区域。净增草地的区域为川西北高原、丘陵和川西南山区,净增草地面积的前四个地州市是遂宁市、泸州市、巴中地区和广安市,净减少草地的区域为盆周山地和平原,净减少草地面积的前四个地州市是广元市、绵阳市、达川市和宜宾市。

An Analysis of Dynamic Change of Grassland in Sichuan Province Based on Remote Sensiong and GIS

An study on the characteristics of grassland dynamic change is very important in protection,growth and utilization of grass resource.Therefore,this paper has tried to make an analysis on the characteristics of grassland dynamic change and its background characteristics as well as spatial distribution of grassland in Sichuan province from mid-1990s to 2000,employing GIS technology under the aid of spatial database platform.The research shows that the net increased grassland are mainly turned from cultivated land while most of net decreased grassland are converted into forst land.In general,the total area of net increased grassland is 3812 hectares,mainly distributed in mild soil erosed,mid soil erosed,intense soil erosed and seriously soil erosed areas as well as areas with slope degree as 5,6,1 and environment quality level as 5,6,4 and 1.The net decreasing of grassland mainly happens in slight soil erosed and extremely soil erosed areas as well as the areas with slope degree as 3,2,4 and environment quality level as 7 and 8.The net increased grassland areas are found on the plateaus and hills in northwestern Sichuan and mountains in southwestern Sichuan with Suining city,Luzhou city,Bazhong prefecture and Guangan city as the top four places,while the net decrease grassland areas are mainly found on the mountains and plateau around Sichuan basin with Guangyuan city,Mianyang city,Dazhou city and Yibin city as the top four places.