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土地利用决定了土壤可蚀性和水文结构.合理的建模方式对正确的评估土地利用变化对流域土壤侵蚀的影响尤为重要.然而土壤侵蚀模型的模拟结果的可靠性受制于众多参数的空间变化.本研究基于格网的分布式土壤侵蚀及泥沙输移模型,结合实验室场次模拟降雨实验以及在单次暴雨条件,揭示流域尺度上土地利用变化对土壤侵蚀及产沙量的影响.其中,土地利用变化主要通过比较卢氏流域(河南境内)1990年和1995年土地利用变化图,以及在1990及1995年土地利用图的4场模拟降雨的反馈特征,发现从1989到1996年平均侵蚀速率随着土地利用变化持续增加,尤其是森林转化成耕地的类型区域.结果表明土地利用变化对区域土壤侵蚀及泥沙供给有显著影响.
Land use determines the soil erodibility and hydrological structure.The reasonable modeling method is particularly important for the correct assessment of the impact of land use change on the soil erosion in the watershed.However, the reliability of the simulation results of the soil erosion model is limited by the spatial variation of many parameters Based on the grid-based distributed soil erosion and sediment transport models, this study combined with laboratory-scale simulated rainfall experiments and single rainstorm conditions to reveal the impact of land-use change on soil erosion and sediment yield at the basin scale. , Land use change mainly through the comparison of 1990 and 1995 land use change maps in the Lushi River Basin (Henan Province) and the feedback characteristics of four simulated rainfalls in land use maps of 1990 and 1995, and found that the average erosion from 1989 to 1996 The rate of land use continued to increase with the change of land use, especially the type of forest converted into cultivated land.The results show that land use change has a significant impact on regional soil erosion and sediment supply.