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首页> 外文期刊>Land Degradation and Development >Evaluation of land-use change effects on runoff and soil erosion of a hilly basin the Yanhe River in the Chinese Loess Plateau
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Evaluation of land-use change effects on runoff and soil erosion of a hilly basin the Yanhe River in the Chinese Loess Plateau

机译：中国黄土高原延河河云河径流与土壤侵蚀土地利用变化影响的评价

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摘要

Starting in 1999, the Grain-for-Green Programme has been implemented in the Loess Plateau to alleviate the severe soil erosion by converting steeply sloping croplands to forestlands or grasslands. To quantify the effects of these conservation efforts, this study identified the land-use changes between 2000 and 2015 and quantified their impacts on runoff and erosion using the Soil and Water Assessment Tools (SWAT) and a typical hilly basin, the Yanhe River basin as a case-study. To heighten the applicability of SWAT to the region, major model parameters were localized and calibrated for the period of 1975-1980 and were then validated for 1981-1987. The R-2 and NS validation indices were 0.70 and 0.65 for the monthly runoff and 0.67 and 0.61 for the sediment load, indicating that the model performance was acceptable. Between 2000 and 2015, the slope croplands were reduced by 39.9%, the forestlands increased by 90.2%, and the grasslands increased by 12.9%. These land-use changes were simulated using SWAT to reduce the basin runoff by 13.8% and the sediment load by 50.7%. Spatial analyses using ArcGIS indicated that the simulated reduction in water yield due to cropland conversion to forestland was more obvious than that due to the conversion to grassland, but the reductions in the sediment yields were similar. The results suggest that the Grain-for-Green practice during this period was effective for preventing soil and water losses.
机译：从1999年开始，在黄土高原中实施了绿色粮食计划，以减轻严重的土壤侵蚀来通过转变为林地或草原。为了量化这些保护努力的影响，本研究确定了2000年至2015年间的土地利用变化，并通过土壤和水评估工具（SWAT）和典型的丘陵盆地，延伸河流域（SWAT）和典型的丘陵盆地量化其对径流和侵蚀的影响。案例研究。为了提高SWAT对该地区的适用性，主要的模型参数是本地化和校准的1975年至1980年，然后验证为1981-1987。每月径流的R-2和NS验证指数为0.70和0.65，沉积物负荷为0.67和0.61，表明模型性能是可接受的。在2000年至2015年期间，坡地农作物减少了39.9％，林地增加了90.2％，草地增加了12.9％。使用SWAT模拟这些土地使用变化将盆地径流减少13.8％，沉积物负荷减50.7％。使用ArcGIS的空间分析表明，由于农田转换为林地的水产量的模拟降低比对草地的转化，但沉积物收益率的减少相似。结果表明，在此期间的谷物对绿色实践对于预防土壤和水损失是有效的。

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