基于RS和GIS的四川省耕地的动态变化特征分析

Analysis of Dynamic Change of Cultivated Land of Sichuan Province Based on Remote Sensing and GIS

耕地动态变化特征的分析研究,对耕地的保护、整理和开发利用均具有极其重要的意义。为此,本文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90年代中期到2000年间的耕地动态变化特征、耕地动态变化的背景特征以及其空间分布特征进行了分析。研究表明,净减少水田部分的主要去向是旱地、居民地和草地,净减少旱地部分的主要去向是居民地和草地,而净增旱地部分的主要来源是水田和林地;净增耕地部分主要是在微度和轻度土壤侵蚀区,第4、第3和第5坡度等级区,而净减少耕地部分主要是在第1坡度等级区;净减少耕地的区域是在平原、丘陵和盆周山地,净减少耕地的前4个地州市是雅安市、乐山市、内江市和成都市,而净增耕地的区域是在川西南山区和川西北高原,净增耕地的前4个地州市是绵阳市、德阳市、阿坝藏族羌族自治州和凉山彝族自治州。

An analysis and study on the characteristics of cultivated land dynamic change is very important in protection, growth and utilization of cultivated land. Therefore, it tries to make an analysis on the characteristics of cultivated land dynamic change and its background characteristics as well as spatial distribution of cultivated land in Sichuan province from mid-1990s to 2000, employing GIS technology under the aid of spatial database platform. The research shows that the net decreased wet rice land are mainly turned into dry farming land, people＇s inhabitation and grassland and the net decreased dry farming land are turned into people＇s inhabitation and grassland, while most of net increased dry farming land are converted from wet rice land and forst land. The net increased cultivated land are found in slight and mild soil erosed areas as well as areas with slope degree as 4, 3 and 5 and the net decreasing of cultivated land mainly happens in areas with slope degree as 1. The net decreased cultivated land are found in the plains, hills and mountains around Sichuan basin with Yaan city, Leshan city, Neijiang city and Chengdu city as the top four places, while the net increased cultivated land are often found on the the mountains of southwestern Sichuan and plateaus of northwestern Sichuan with Mianyang city, Deyang city, Aba Tibetain and Qiang Autonomous Prefecture and Liangshan Yi Autonomous Prefecture as the top four places.