摘要
以2005年2月4日1∶1万SPOT5影像(空间分辨率2.5m)为基本数据源,在获取该流域喀斯特各级石漠化分布格局信息的基础上,探讨喀斯特石漠化强度与坡度的空间尺度关系。王家寨小流域石漠化集中分布在15°～25°坡度范围内,簸箩地区轻度、中度、强度集中分布在<5°、15°～25°的坡度范围。而大尺度研究发现石漠化发生率最大的是>25°的坡地,研究尺度越大,则石漠化集中分布的坡度范围也越高。因此,大尺度分析得出的结论不能指导小尺度石漠化土地的防治工作。
Based on the image of SPOT5 in 2005, karst rocky desertification landscape patterns in Boluo area was classified as： no, latent, slight, moderate, strong, and extremely strong karst rocky desertification types. Furthermore, this paper discussed the relationship between karst rocky desertification and slope. The results show that： the karst rocky desertification land gathered in the slope range of 15° to 25° in Wangjiazhai catchments, and located in areas with slope〈5° or 15°-25°. But the occurrence ratio ofkarst rocky desertification of areas with slope〉25° is the biggest in larger spatial scales. The slope range of areas which karst rocky desertification located increases with the spatial scale-up. So, the conclusions derived from macro scale studies should not apply to the comprehensive melioration the karst rocky desertification in small spatial scales.
出处
《水土保持研究》
CSCD
北大核心
2009年第5期70-72,77,共4页
Research of Soil and Water Conservation
基金
国家重点基础研究发展计划项目(2006CB403200)
教育部“新世纪优秀人才支持计划”(NCET-05-0819)
关键词
石漠化
坡度
空间尺度
karst rocky desertification
slope
spatial scale
