In order to gain a detailed understanding of the soil erosion status in the dry-hot valley region, in this study, the measured data from runoff plots in dry-hot valleys were widely collected, organized and analyzed, thus the soil erosion modulus under the average slope of the local main land use types were estimated and compared with the allowable soil loss amount. The results indicated that:(1) The soil erosion modulus of shrub-grass land, agricultural land, orchard land and bare land under the standard slope length and slope gradient was 110.88, 389.58, 320.66 and 507.87 t/(km2·a), respectively, indicating that soil erosion modulus in the bare land was the highest, followed by the agricultural land, orchard land and shrub-grass land. (2) Soil and water conservation measures such as lockdowns, horizontal terraces, terraces and hedgerows all played an important role in reducing soil erosion with the average reduction of 72%. (3) The soil erosion modulus of the main land use types, especially agricultural land and orchard land in all the dry-hot valleys, were significantly higher than the allowable soil loss under the local average slope, indicating that the soil erosion situation in the region was still quite severe. This study could help to further deepen the understanding of the soil erosion principles in the dry-hot valleys and provide important technical supports for subsequent soil erosion control and optimal allocation of soil and water conservation measures.
何敏怡, 钟荣华, 郭乾坤, 段兴武, 单志杰.基于径流小区实测的干热河谷土壤侵蚀荟萃分析[J].水土保持学报,2023,37(5):291~297复制