生态学杂志2013，Vol.32Issue(7)：1903-1911,9.
基于地形因子的三峡库区腹地耕地演变——以草堂溪流域为例
Evolution of cultivated land in center region of the Three Gorges Reservoir Area based on terrain factors: A case study of Caotangxi watershed
摘要
Abstract
Based on the remote sensing images in 1990,2000,2004,and 2007 and the 1 ∶ 50000 DEM,and by using software ArcGIS 9.3 and Fragstas 3.3,this paper studied the evolution of cultivated land in Caotangxi watershed,a center region of Three Gorges Reservoir Area.The database of the cultivated land in Caotangxi watershed was established,and the slope,elevation,and terrain niche index were produced.Then,the slope gradient,elevation gradient,and terrain niche gradient were calculated with the database of the cultivated land so as to discuss the distribution characteristics of the cultivated land at different terrain gradients according to the dimensionless distribution index.The results showed that the cultivated land in the watershed was mainly distributed in the slope gradient range of 15°-35°,elevation range of 500-1000 m,southeast and south slopes,and in middle and high terrain gradient.An obvious change in the area and spatial distribution of cultivated land took place in the study area in 1990-2007.With the increasing terrain gradient index,the distribution area of cultivated land increased first and decreased then.The remarkable reduction in the aggregation index of cultivated land was mainly in the fourth and fifth terrain niche gradients (1.2-1.5 and 1.5-2.0,respectively),showing that the aggregation of cultivated land in middle and high terrain gradient decreased,the cultivated land was fragmented,and the ecological environment was becoming well.关键词
变化幅度/地形位指数/聚集度/平均最邻近距离Key words
variation amplitude/ terrain niche index/ aggregation index/ average nearest neighbor distance分类
资源环境引用本文复制引用
王永艳,李阳兵,甘彩红,李源..基于地形因子的三峡库区腹地耕地演变——以草堂溪流域为例[J].生态学杂志,2013,32(7):1903-1911,9.基金项目
重庆市自然科学基金项目(2010BB0322)、重庆市教育委员会科学技术研究项目(KJ080818)和重庆市地理学重点学科项目(2011)资助. （2010BB0322）
