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。
The aims of this study were to analyze the correlation between rocky desertlllcatlon at ctxlterent slopes and water and soil loss quantitatively, and provide the scientific theoretical basis for the ecological environment management and restoration in the county area. Taking Panxian County of Guizhou Province as the research area, with the support of RS and GIS technology, based on ALOS remote sensing images, lithology and 1 ： 50 000 topographic maps, using Remote sensing interpretation method, Surface analysis and Map Algebra principle, the index factors of rocky desertification and water and soil loss were extracted. Through ArcGIS spatial analysis and correlation analysis model, analysis of the correlation between rocky desertification at different slopes and water and soil loss in Panxian County. The results showed that： Panxian County had a rocky desertification area of 1 008.45 kmz , accounting for 24.9% of the total area, the degree of rocky desertification was mainly mild, moderate and strong, accounting for 45.47%, 29.67% and 20.29% of the total area of rocky desertification, respectively. Water and soil loss area was 521.05 kmz , accounting for 12.85% of the total area, the degree of water and soil loss was maily mild and moderate, and 67.75%and 17.36% of the area of water and soil loss, respectively. Rocky desertification and water and soil loss occurred in the place where the slopes were between 5 and 35 degrees, accounting for 85.08% and 82.45% of the area of rocky desertification and water and soil loss, respectively. When the slopes were less than 8 degrees, there was a negative correlation between rocky desertification and grade of water and soil loss, and between water and soil loss and grade of rocky desertification. When the slopes were between 8 and 35 degrees, the area of rocky desertification and water and soil loss decreased first, then increased, and later decreased again. When the slopes were greater than 35 degrees, rocky desertification and water and soil loss grade were negatively
出处
《水土保持学报》
CSCD
北大核心
2017年第2期79-86,共8页
Journal of Soil and Water Conservation
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)
关键词
石漠化
水土流失
坡度
相关性分析
盘县
rocky desertification
water and soil loss
slope
correlation analysis
Panxian County
