铯-137同位素示踪法测算小流域土壤侵蚀量的研究

 介绍了~(137)Cs方法测算土壤侵蚀量的基本原理。研制了适合复杂岩性侵蚀区使用的~(137)Cs侵蚀模型。并以鄂东花岗片麻岩侵蚀区的某荒坡小流域为例,计算了其坡面土壤侵蚀量和侵蚀模数,计算结果与径流场实测结果十分接近。此外,还对该流域坡面土壤侵蚀的分选性做了初步评价。

A Study on 137Cs Method Used in Determining Soil Erosion of Small Watershed

In the paper, a fundamental principle for using the radionuclide cesium-137 as a tracer to estimate soil erosion is introduced and 137Cs erosion model suitable for complicated lithological soil erosion area is developed. Case study is made in a non-agricultural small watershed in the granitic gneiss erosion area of the eastern Hubei Province. The Erosion amount and the modulus of erosion of the watershed calculated by the model are very close to those determined by the runoff experimental fields. A preliminary evaluation is also made on the particle selectivity during erosion of sloping fields.