摘要
本文利用3S技术,通过对1975、1985、1995和2005年的内蒙古奈曼旗TM影像的解译,提取出近30年来该地区耕地动态变化的信息。从耕地数量、变化速率以及耕地空间格局动态变化等方面对耕地的动态变化进行了全面的分析,并对其驱动机制进行了探讨。研究表明:近30年来,奈曼旗耕地面积呈增加趋势,而变化速度呈下降趋势;耕地主要向林地和固定沙丘地转化;耕地连通性指数、破碎度指数的变化呈波动趋势;耕地斑块数量的变化趋势与破碎度指数相同;耕地的分形维数随着人为干扰程度的增加呈现出逐渐降低的趋势。耕地在整个景观中的影响作用逐渐加强。耕地动态变化的主要驱动因素是耕地需求增加与土地退化之间的矛盾。
Based on 3S technology, the TM images of Naimanqi in Inner Mongolia of the year 1975,1985,1995,2005 were interpreted and the information of the dynamic changes of cropland in study area during recent 30 years was obtained. Comprehensive analyses were taken to discuss the dynamic changes of the eropland from such aspects as： quantity changes; changing speed and dynamic changes of spatial patterns. The results showed that during recent 30 years, the cropland area presented an increasing trend; the changing speed presented a decreasing trend; The cropland mainly transformed to woodland and fixed sandy land; the connectivity and fragmentation indices of the cropland showed a fluctuated trend ; The patch numbers of cropland had the same changing trend as the fragmentation index; The fractal dimension index of cropland reduced gradually along with the strengthening of human activities; The impacts of the cropland on whole landscape were enhancing gradually. The primary driving force of the dynamic changes of cropland was the contradiction between the increase of cropland requirement and the soil degradation. ：
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2008年第5期25-30,共6页
Journal of Arid Land Resources and Environment
基金
中国科学院野外台站项目(1731690200015)资助
关键词
耕地
动态变化
景观指数
3S技术
cropland
dynamic change
landscape indices
3 S technology
