基于坡度等级的喀斯特山区石漠化与水土流失相关性研究——以贵州省盘县为例

发布时间：2018-07-10 16:19

本文选题：石漠化 + 水土流失　；参考：《水土保持学报》2017年02期

【摘要】：为了定量分析不同坡度等级下石漠化与水土流失之间的相关性,为县域生态环境治理与修复提供科学理论依据,以贵州省盘县为研究区,在遥感与地理信息系统技术支持下,以ALOS遥感影像、岩性及1∶50 000地形图等为基础数据源,采用遥感解译方法、表面分析及地图代数原理,提取出石漠化与水土流失的各指标因子。通过ArcGIS空间分析及相关性分析模型,从不同坡度等级下分析盘县石漠化与水土流失的相关性。结果表明:盘县石漠化面积为1 008.45km~2,占总面积的24.9%,已发生石漠化等级以轻度、中度和强度为主,分别占盘县石漠化面积的45.47%,29.67%,20.29%;水土流失面积为521.05km~2,占总面积的12.85%,已发生水土流失等级以轻度和中度为主,分别占盘县水土流失面积的67.75%和17.36%。石漠化与水土流失发生区坡度以5°~35°为主,分别占石漠化与水土流失面积的85.08%与82.45%。当坡度8°时,石漠化与水土流失等级、水土流失与石漠化等级存在负相关关系。当坡度为8°~35°时,已石漠化与已水土流失面积均呈现出先减小后增加再减小的趋势。当坡度35°时,石漠化与水土流失等级在强烈侵蚀等级以下表现为负相关,超过强烈侵蚀为正相关;而水土流失与石漠化等级在轻度石漠化等级以下表现为正相关,超过轻度石漠化为负相关。
[Abstract]:In order to quantitatively analyze the correlation between rocky desertification and soil erosion at different slope levels, and to provide a scientific theoretical basis for the ecological environment control and restoration in the county, taking Pan County, Guizhou Province, as the research area, with the support of remote sensing and geographic information system (GIS) technology. Based on ALOS remote sensing image, lithology and 1:50 topographic map, the index factors of rocky desertification and soil erosion were extracted by using remote sensing interpretation method, surface analysis and map algebra principle. Through the spatial analysis and correlation analysis model of ArcGIS, the correlation between rocky desertification and soil erosion in Panxian was analyzed from different slope grades. The results showed that the area of rocky desertification was 1 008.45 km2, accounting for 24. 9% of the total area. The grade of rocky desertification was light, moderate and intensity. The area of soil erosion is 521.05km2, accounting for 12.85km2 of the total area. The grade of soil and water loss is mainly light and moderate, accounting for 67.75% and 17.36% of the area of soil and water loss, respectively. The slope of rocky desertification and soil erosion area is 5 掳~ 35 掳, which accounts for 85.08% and 82.45% of the area of rocky desertification and soil erosion, respectively. When the slope is 8 掳, there is a negative correlation between the grade of rocky desertification and soil erosion, and between soil erosion and grade of rocky desertification. When the slope is 8 掳~ 35 掳, the areas of rocky desertification and soil erosion show a tendency of decreasing first and then decreasing. When the slope is 35 掳, there is a negative correlation between the grade of rocky desertification and soil erosion below the level of strong erosion, and a positive correlation between soil erosion and grade of rocky desertification below the grade of mild rocky desertification. More than mild rocky desertification is negative correlation.
【作者单位】：贵州师范大学喀斯特研究院;贵州省喀斯特山地生态环境国家重点实验室培育基地;国家喀斯特石漠化防治工程技术研究中心;
【基金】：国家自然科学基金项目“喀斯特石漠化地区生态资产与区域贫困耦合机制研究”(41661088) 贵州省重大应用基础研究项目“喀斯特石漠化生态修复及生态经济系统优化调控研究”(黔科合JZ字[2014]200201) 贵州省高层次创新型人才培养计划——“百”层次人才(黔科合平台人才[2016]5674) 盘县发展和改革局软科学研究项目“盘县城镇、农业与生态三类空间划分研究”(20151231)
【分类号】：S157.1

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