用Cs-137示踪法研究浙江天台县典型坡面的土壤侵蚀规律

Cs-137示踪法具有简单、快速、准确的优点,已广泛应用于土壤侵蚀研究.本文在非耕地土壤侵蚀模型的基础上,在浙江省天台县典型区域内,得出Cs-137基准值为2382.02 Bq/m2,土壤Cs-137剖面分布函数为 Cs = 243.73e-0.113z,同时分析了非耕地典型坡面上不同部位的侵蚀与沉积规律.结果表明:土壤侵蚀主要发生在土壤表层20 cm以内的范围,坡地土壤净流失上部大于中下部,在距坡脚附近有土壤沉积现象.坡面不同部位的土壤侵蚀速率并不随着坡长的增加而简单地增大,而是随地表植被结构和覆盖度的不同而变化.

Soil Erosion Law Based on Cs-137 Tracer Method in Typical Slope, Tiantai County, Zhejiang Province

Cs-137 tracer method is simple, rapid and accurate, which has been widely used in soil erosion research. This article, taking Tiantai County as an example on the basis of non-farming soil erosion model, obtained the background value of Cs-137 (2382.02 Bq/m2) and soil Cs-137 profile distribution function (243.73e-0.113z), and also analyzed soil erosion and deposit law in different positions simultaneously. The results showed that soil erosion mainly occurred in the topsoil within 20 cm and the net loss of topsoil was higher than those of the middle and below slope locations, soil deposition occurred in the neighborhood of the foot - slope. Soil erosion rate at the different locations in the slope didn't increase with the length of slope simply, but changed with the surface vegetation structure and coverage.