基于DEM的小流域石漠化成因的坡度分析——以贵州连续性石灰岩地区为例  

Slope Analysis of Rocky Desertification Based on DEM in Small Catchments as Exemplified by a Homogenous Limestone Region in Guizhou Province

作　　者：谭秋[1] 

机构地区：[1]贵州师范大学地理与环境科学学院,贵阳550001

出　　处：《地球与环境》2009年第2期182-187,共6页Earth and Environment

基　　金：国家重点基础研究发展计划项目(2006CB403201);贵州省科学技术基金(黔科合J字[2008]2012号)

摘　　要：本文选择三个典型的连续性石灰岩为基底、不同地貌区域的小流域为研究对象，通过DEM数据源在GIS软件上提取坡度信息，对其石漠化分布与坡度间的相关性进行分析。结果表明从高原区到峡谷区，石漠化的发生在面积上大体相当，强度上则愈加严重。连续性石灰岩地区各坡度上都存在生态恶化的隐患，但坡度对于其生态的恢复并不是明显的限制因素。轻度石漠化和中度石漠化的面积比在坡度的等级由低到高的过程中存在着中间的高峰值。轻、中度石漠化在高原区和峡谷区中集中于15-35°坡度；斜坡区则集中在35-45°间。强度石漠化在高原区和斜坡区中25°以上的坡度中集中分布、峡谷区则在坡度15～45°内。在喀斯特地区的低坡度上要注意人为活动的合理性。The GIS slope information was developed based on the DEM data. We selected three catchments in different landform areas to analyze the correlation between rocky desertification and slope gradient. The results showed that the rocky desertification areas in these regions are nearly equivalent; rocky desertification becomes serious gradually from plateau to valley. There exist potential ecological deteriorations on the continuous limestone area on the slopes but the slope is not the important limiting factor for ecological restoration. There is a middle peak value in the area ratio of mild and moderate rocky desertification during the slope change from low to high. Mild and moderate rocky desertification focus on 15 to 35 degree slope in the plateau and valley, 35 to 45 degree in the slope region. Intense rocky desertifications focus on above 25 degree slope in the plateau and slope region, 35 to 45 degree in the valley. The low slope area must pay attention to the rationality of human activities in karst areas.

关 键 词：连续性碳酸盐岩 喀斯特 石漠化治理 

分 类 号：P588.245[天文地球—岩石学] P642.254[天文地球—地质学]