中文摘要：

布哈河位于青海湖西侧，是注入青海湖的主要水源，近年来由于受到自然与人类活动的影响，流域内水土流失情况日益严重。由于本区土壤侵蚀研究基础十分薄弱，为了获得较为可靠的侵蚀定量数据．本文采用在区域土壤侵蚀研究和侵蚀量估算应用较为成熟的137Cs示踪技术．对布哈河下游地区进行了土壤侵蚀的定量研究。经过采样、处理、测试、分析、计算等过程，初步估算了布哈河下游地区的土壤侵蚀强度。结果表明：土地利用类型相同的样点上，侵蚀量大致相同。土壤的容重也在一定程度上影响着侵蚀量。经过137Cs模型计算．布哈河下游的土壤侵蚀强度为1198．83t·km-2^·a-1^．属于中度侵蚀水平。

英文摘要：

Buha River,located in the west of Qinghai Lake, is one of the major water resources of Qinghai Lake. But in recent years, soil erosion in this basin has been getting worse affected by natural and human activities. With the absence of soil erosion investigation data, we use the 137Cs technique which is mastered in regional soil erosion investigation and estimation to conduct the erosion research and get some reliable quantitative erosion data in Buha River downstream. After sampling, processing, testing, analysis and calculation, we preliminary estimated the soil erosion intensity. The results showed that：the same land use pattern samples had the equivalent erosion amount, affected by soil bulk density at some degrees. Using the 137Cs calculation model, the soil erosion intensity is 1198.83 t · km-2· a-1 ,which belongs to a moderate erosion level.