摘要
以2个时期的遥感图像所解译的土地利用数据为基本信息源,基于GIS工具,选用斑块密度、廊道密度、斑块破碎度、分离度和斑块面积变异系数5个指标对金塔绿洲的破碎化程度进行了分析。结果表明:(1)1990—2000年,金塔绿洲总体的景观破碎化程度轻微地降低。(2)从景观类型上看,基质的破碎化程度增强;水浇地面积增大,趋于集中分布,破碎化程度降低;城镇用地破碎度增加,分离度减小。这些变化与人类开发利用活动的程度和方式有关,体现了荒漠基质受人类影响而逐步形成的典型农业型绿洲的特点。
Based on Remote Sensing and GIS, this paper quantified the landscape fragmentation of Jinta oasis by using the patch density, corridor density, fragmentation, separation, patch size coefficient of variation and area standard deviation. From 1990 to 2000, the landscape fragmentation degree in Jinta Oasis descended slightly. In the landscape type level, the landscape fragmentation degree of the matrix (bare soil, bare rock and gravel land) increases, meanwhile, the area of the matrix decreases, which shows that the influence of human beings on matrix increases. The irrigated land area rises and the total number of patches decreases. So the distribution of irrigated land is more centralized and the fragmentation becomes lower. The area of city and town inhabitant land increases clearly. Its fragmentation increases and separation index decreases. The human activities have contributed to the changes of fragmentation degree in Jinta oasis. Dense corridor system is one of most extrusive characteristics of the arid region. The corridor density of the irrigated land, forest and resident area is maximal, showing that the effect of oasis corrriod on them is the most. The corridor density has relation with the landscape fragmentation. The pattern of Jinta oasis embodies the characteristic of typical agriculture oasis in Gobi and desert matrix influenced by human beings.
出处
《中国沙漠》
CSCD
北大核心
2004年第2期201-206,共6页
Journal of Desert Research
基金
国家自然科学基金重大研究计划项目(90102004)资助
