基于GIS与^(137)Cs技术的土壤侵蚀微观研究  

Microcosmic Study on Slope Erosion Based on Geographical Information System and Cesium-137 Technology

作　　者：吴永红[1] 张虎林[1] 寇权[1] 孙耀胜[1] 刘海燕[1] 

机构地区：[1]黄委会西峰水土保持科学试验站,甘肃西峰745000

出　　处：《水土保持研究》2007年第2期40-42,共3页Research of Soil and Water Conservation

基　　金：黄土高原水土保持世界银行贷款项目"梯田监测方法及评价系统研究"

摘　　要：坡地侵蚀的研究是进行流域侵蚀研究的基础,影响坡地土壤侵蚀的因素很多,但最主要的是地形因子。通过137Cs技术和GIS技术,以黄土高塬沟壑区的多个自然汇流坡面为研究对象,从微观角度探讨了在自然坡面条件下不同地形因子对坡面土壤侵蚀的影响,根据土壤侵蚀在坡面上的垂直分异规律,对不同部位土壤侵蚀量的差异及不同地形因子对土壤侵蚀的影响大小进行了初步探索性研究。结果表明:在微观尺度内,坡度、坡长等常规因子对土壤侵蚀的影响并不像径流小区测定的那样明显,似乎已经退居到次要位置。借助GIS对土壤侵蚀进行微观研究,可以发现一些用常规方法很难发现的规律,有助于我们更加深刻地认识土壤侵蚀的变化规律。Sloping fields are the base for studying a whole drainage basin. There are many factors that influence the slope soil erosion, but the most important is terrain. Cesium-137 and GIS（Geographical Information System） technology was used as main methods and several natural conflux slopes in gullied area of Loess Plateau were taken as studying objects,a preliminary study from a microcosmic point of view on the influences of different terrain factors was made. According to the vertical variation rules of slope erosion, the differences of soil erosion amount between different slope positions was studied and the contributions of dif- ferent terrain factors was analyzed. The result shows：in micro scale, the influence of general factors such as gradient and slope length is not as distinctive as in proving ground;it seems that the role of these factors move to a backseat. By means of GIS,we can find some rules that are hard to be found by routine methods,it can help us to understand the erosion law more profoundly.

关 键 词：地理信息系统 ^137CS 土壤侵蚀 微观研究 

分 类 号：S157[农业科学—土壤学] TP79[农业科学—农业基础科学]