基于GIS的紫色土区地形因子特征分析  

Analysis of Terrain Factor Characteristics of Purple soil Region Based on GIS

作　　者：赵维军[1] 董奇群 张广迎 秦伟[2] 李宏溪 王亚非 杨若绡 ZHAO Weijun;DONG Qiqun;ZHANG Guangying;QIN Wei;LI Hongxi;WANG Yafei;YANG Ruoxiao(Key Laboratory of Tourism and Resources Environment in Colleges and Universities of Shandong Province,Taishan University,Shandong Taian 271000;Department of Sedimentation,China Institute of Water Resources and Hydropower Research,Beijing 100044,China)

机构地区：[1]泰山学院,山东省高校“十二五”旅游与资源环境重点实验室,山东泰安271000 [2]中国水利水电科学研究院泥沙研究所,北京100044

出　　处：《中国农业科技导报》2019年第8期63-70,共8页Journal of Agricultural Science and Technology

基　　金：国家自然科学基金项目(41877073);山东省自然科学基金项目(ZR2019MD031)资助

摘　　要：为探索紫色土区地形因子的具体分布特点,基于ASTER GDEM(30 m分辨率),利用Arc GIS软件的空间分析等工具,提取并分析紫色土区坡度、坡长、坡度坡长因子(LS因子)、沟壑密度等地形因子的分布特征。结果表明:全区>15°的陡坡占比达58%,其中秦巴山山地区陡坡占比最大,达80%;坡长在0~40 m范围内占比达60%,主要集中在川渝山地丘陵区;LS因子值>15的陡坡占比达55%,主要分布在秦巴山山地区与武陵山山地丘陵区,与坡度分布一致;区域尺度的沟壑密度为0.69 km/km2,其中川渝山地丘陵区沟壑密度最小(0.57 km/km^2),低于区域尺度沟壑密度均值的17.39%。研究结果可为紫色土区水土流失评价、土壤侵蚀预报及生态修复与重建提供科学依据。In order to explore the specific distribution characteristics of terrain factors in purple soil region,based on ASTER GDEM ( 30 m resolution ratio),this paper extracted and analyzed the distribution characteristics of terrain factors,including slope gradient,slope length,slope and length factor ( LS factor) and gully density,etc.terrain factors by spatial analysis tools of ArcGIS.The results showed that the proportion of steep slope (>15°) was 58% in the whole region,that in Qinba mountain region was the largest,reaching 80%;that in the regions with slope length within the scope of 0 ~40 cm took 60%,mainly concentrated in Sichuan and Chongqing mountain hilly regions.The proportion with LS factor value >15 was 55%,mainly distributed in Qinba mountain region and Wuling mountain and hilly regions,with the same slope distribution.The gully density of purple soil region was 0.69 km/km2,that in Sichuan and Chongqing mountain and hilly regions were the least,only 0.57 km/km^2,being inferior to 17.39% of the average scale gully density value.The results provided scientific basis for soil erosion assessment,soil erosion prediction,and ecological repair and reconstruction in the purple soil regions.

关 键 词：地形因子 特征 GIS 紫色土区 统计分析 

分 类 号：S157[农业科学—土壤学]