Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Int J Environ Res Public Health. 2019 Apr 16;16(8):1371. doi: 10.3390/ijerph16081371.
The study of the variability of soil erosion in mountainous areas provides the basis for soil and water conservation work and forest ecological construction in a targeted way. In this study, Liangshan Town catchment, a typical catchment in the Hengduan Mountains region, southwest China, was selected to investigate the variation of soil erosion in different vertical zones using the Cs tracing technique. The mean Cs reference inventories varied between 573.51 and 705.54 Bq/m, with the elevation increasing from 1600 to 2600 m. The rates of soil erosion exhibited a significant variation. Under the same land cover condition, the average annual soil erosion modulus of high-elevation forest (elevation > 2200 m) was 400.3 t/(km·a). However, the average annual soil erosion modulus of a low-elevation sparse forest (elevation < 1600 m) was as high as 1756 t/(km·a). The average annual soil erosion modulus of the sloping farmland, mainly distributed at elevations of 1600-2200 m, was estimated to be 2771 t/(km·a). These results indicate that effective soil management measures need to be implemented on the cultivated sloping land in the future.
山区土壤侵蚀变异性研究为有针对性地开展水土保持工作和森林生态建设提供了依据。本研究选择中国西南横断山区典型流域——凉山镇流域，采用 Cs 示踪技术研究不同垂直带土壤侵蚀的变化。Cs 参考本底库存介于 573.51-705.54 Bq/m 之间，随着海拔从 1600 米升高到 2600 米而增加。土壤侵蚀速率表现出显著的变化。在相同的土地覆盖条件下，高海拔森林（海拔>2200 m）的平均年土壤侵蚀模数为 400.3 t/(km·a)。然而，低海拔稀疏林（海拔<1600 m）的平均年土壤侵蚀模数高达 1756 t/(km·a)。主要分布在 1600-2200 m 海拔高度的坡耕地的平均年土壤侵蚀模数估计为 2771 t/(km·a)。这些结果表明，未来需要在耕种的坡地上采取有效的土壤管理措施。
