三峡库区耕地转型及影响因素

Characteristics and Influential Mechanism of Cultivated Land Use Transition in Three Gorges

基于三峡库区重庆段2000年和2015年的土地利用数据,借助Arc GIS平台与地理加权回归模型,在乡镇尺度上分析了三峡库区重庆段2000—2015年的耕地转型空间特征,并从自然、社会经济、区位等方面剖析了三峡库区重庆段耕地转型的影响因素。结果表明:(1)2000—2015年三峡库区重庆段的耕地数量分布呈现明显的"南增北减"的地域差异特征,土地转型以耕地和林地互相转换为主。(2)地理加权回归结果表明,同一影响因素在不同区域对耕地转型的作用方向与作用强度不同,发生相同耕地转型的不同区域,影响因素也各不相同。因此,各级地方政府在开展耕地相关工作时,要因地制宜,合理利用耕地资源。

Based on the land use data of Three Gorges Reservoir Region of Chongqing in 2000 and 2015, taking advantage of ArcGIS platform and established geographically weighted regression model, characteristics of cultivated land use transition from 2000 to 2015 in Three Gorges Reservoir Region of Chongqing were analyzed on the town scale. Besides, influential mechanism was also analyzed from the aspects of nature, social economy,location etc. The results showed： ① From 2000 to 2015, cultivated land use transition was mostly the conversion of cultivated land to forestland, and there was an unbalanced and distinct spatial distribution which stood for cultivated land increased in the south but decreased in the north region during the study period. As the main recipients, forestland was also the main source of cultivated land. ②The GWR＇ s results showed the same influential factor＇s impacts differed in different areas where cultivated land use transition was the same and influential factors might vary in the different area where there had the same cultivated land use transition. So, the local governor should adjust measures to local conditions to make full use of cultivated land use resource.