摘要
以卫星遥感数据为基础提取了松花坝流域土壤侵蚀程度分级信息,以DEM地形数据为基础提取了研究区内的坡度、坡向等地形信息,从区域的角度定量分析了土壤侵蚀与地形因子之间的相互关系。研究表明,土壤侵蚀与地形因子存在非线性关系,松花坝流域土壤侵蚀主要集中在坡度5°～25°的坡地,且侵蚀面积随着坡度的增加呈递增趋势;当坡度超过25°时,侵蚀面积随坡度的上升而下降。在坡向因子变化条件下,土壤侵蚀指数平地土壤最大,阳坡半阳坡大于阴坡及半阴坡,其中在平地区域开发建设项目会对土壤侵蚀指数产生一定影响。
Utilizing the soil erosion grading information in remote sensing data of Songhuaba watershed of Kun- ming, based on the DEM, the slope gradients and aspects within the study area were extracted, the correlation be- tween soil erosion and terrain factors at Songhuaba watershed was studied. The results implied that the relationship between soil erosion and terrain factor was non-linear. The soil erosion in Songhuaba watershed was mainly occurred at the slope land between the gradient of 5 ° to 25 °, with the increase of gradient, the erosion area showed the tendency of decrease, once the slope gradient over 25°, the erosion area decreased as the slope gradient increasing. As far as the slope aspect was concerned, the soil erosion index of the flat ground was the highest, the soil erosion indexes of sunny slope and half sunny slope were higher than that of shady slope. Construction project conducted at flat ground will produce some impact on soil erosion index.
出处
《西部林业科学》
CAS
北大核心
2012年第6期63-67,共5页
Journal of West China Forestry Science
基金
林业公益性科研专项经费项目(200904030)
"十二五"环境领域国家科技计划课题(2012BAC09B00)
关键词
土壤侵蚀
坡度
坡向
综合指数
soil erosion
slope gradient
slope aspect
soil erosion comprehensive index
