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首页> 外文期刊>The Science of the Total Environment >The influence of changes in land use and landscape patterns on soil erosion in a watershed
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The influence of changes in land use and landscape patterns on soil erosion in a watershed

机译：流域土地利用和景观格局变化对土壤侵蚀的影响

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It is very important to have a good understanding of the relation between soil erosion and landscape patterns so that soil and water conservation in river basins can be optimized. In this study, this relationship was explored, using the Iiusha River Watershed, China, as a case study. A distributed water and sediment model based on the Soil and Water Assessment Tool (SWAT) was developed to simulate soil erosion from different land use types in each sub-basin of the Iiusha River Watershed. Observed runoff and sediment data from 1985 to 2005 and land use maps from 1986, 1995, and 2000 were used to calibrate and validate the model. The erosion modulus for each sub-basin was calculated from SWAT model results using the different land use maps and 12 landscape indices were chosen and calculated to describe the land use in each sub-basin for the different years. The variations in instead of the absolute amounts of the erosion modulus and the landscape indices for each sub-basin were used as the dependent and independent variables, respectively, for the regression equations derived from multiple linear regressioa The results indicated that the variations in the erosion modulus were closely related to changes in the large patch index, patch cohesion index, modified Simpson's evenness index, and the aggregation index. From the regression equation and the corresponding landscape indices, it was found that watershed erosion can be reduced by decreasing the physical connectivity between patches, improving the evenness of the landscape patch types, enriching landscape types, and enhancing the degree of aggregation between the landscape patches. These findings will be useful for water and soil conservation and for optimizing the management of watershed landscapes.
机译：充分了解土壤侵蚀与景观格局之间的关系非常重要，这样才能优化流域的水土保持。在本研究中，以中国的Iiusha河流域为例，探讨了这种关系。开发了基于土壤和水评估工具（SWAT）的分布式水和泥沙模型，以模拟Iiusha流域每个子流域不同土地利用类型的土壤侵蚀。利用1985年至2005年观测到的径流和泥沙数据以及1986年，1995年和2000年的土地利用图来校准和验证该模型。使用不同的土地利用图，通过SWAT模型结果计算每个子流域的侵蚀模数，并选择12种景观指数，并计算它们以描述每个子流域不同年份的土地利用。来自多个线性回归的回归方程分别使用了每个子流域的侵蚀模数和景观指数的绝对值的变化作为因变量和自变量，而不是绝对值的变化。结果表明，侵蚀量的变化模量与大补丁指数，补丁内聚指数，改良的辛普森均匀度指数和聚集指数的变化密切相关。根据回归方程和相应的景观指数，发现可以通过减少斑块之间的物理连通性，提高景观斑块类型的均匀性，丰富景观类型以及增强景观斑块之间的聚集程度来减少流域侵蚀。 。这些发现对于水土保持和优化流域景观管理将是有用的。

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