According to the change trend of rainfall in Weihe River Basin in Shaanxi, the paper established the scenario analysis method to predict the changes of runoff using distributed hydrological model.

结合渭河流域陕西片的降雨变化趋势，建立了运用分布式水文模型预测流域径流变化规律的情景分析方法。

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The impacts of climate change, groundwater overdraft, surface runoff and food production changes on water resources are analyzed.

分析了气候变化、地下水超采、地表径流及粮食产量变化等方面对水资源的影响。

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Compared with traditional uncovered farmland, a greenhouse region changes the runoff, erosion, and affects generation of nonpoint source pollutants.

相对于传统的露天种植，塑料大棚改变了降雨径流和土壤侵蚀过程，进而影响面源污染物的产生。

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Those very herbicide-resistant plants, now grown on more than 220 million acres annually worldwide, have spurred the adoption of more environment-friendly herbicides and agricultural practices--changes that have markedly reduced soil erosion, the runoff of agricultural chemicals and carbon dioxide emissions, and increased yields.

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