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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >China's progress towards sustainable land degradation control: Insights from the northwest arid regions
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China's progress towards sustainable land degradation control: Insights from the northwest arid regions

机译：中国对可持续土地退化控制的进展：西北干旱地区的见解

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摘要

Soil erosion is a widespread environmental problem, which threatens the environmental sustainability. The northwest arid region (NAR) in China is known as one of the most severe soil loss in the world that suffering from wind erosion. Based on the Revised Wind Erosion Equation (RWEQ), the spatio-temporal change of wind erosion was identified, and the underlying drivers and influencing factors of soil erosion process were investigated. In addition, the implications of constraint effects in soil erosion control were discussed. The results showed that the wind erosion from 1990 to 2013 was substantially lessened, and the government-aided desertification prevention and control programs, as well as increasing precipitation and decreasing wind speed might have contributed to these trends. The constraint line analyses indicated that the vegetation cover had nonlinear and threshold effects on soil erosion through constraining the water condition (precipitation). Specifically, when the precipitation is below the threshold (approximately 50-100 mm yr(-1) in the NAR), the precipitation (water condition) is not sufficient to maintain a good vegetation cover (about 20-40%), therefore the vegetation cannot efficiently prevent wind erosion. However, once the precipitation exceeds this threshold, the vegetation's sand retention function will enhance and thereby reducing soil loss substantially. Vegetation cover has a lower and an upper threshold for controlling wind erosion. A plant cover lower than 10% does little to reduce wind velocity at the soil surface. The effect of vegetation on reducing wind erosion basically reaches the maximum when plant cover is 40% or above. The constraint effects of precipitation on vegetation cover in the arid region should be considered to improve the efficiency of afforestation and reforestation efforts aiming at mitigating and preventing soil loss.
机译：土壤侵蚀是一种广泛的环境问题，威胁着环境可持续性。中国西北干旱地区（NAR）被称为世界上最严重的土壤损失之一，遭受风蚀。基于修订的风蚀方程（RWEQ），确定了风蚀的时空变化，研究了土壤侵蚀过程的潜在驱动因素和影响因素。此外，还讨论了约束效应对土壤侵蚀控制的影响。结果表明，1990年至2013年的风侵蚀大幅减少，政府援助荒漠化防治方案以及增加降水和风速减少可能导致这些趋势。约束线分析表明，植被覆盖物通过约束水条件（沉淀）对土壤侵蚀的非线性和阈值效应。具体地，当沉淀低于阈值时（NAR中约50-100mm YR（-1）），沉淀（水状况）不足以保持良好的植被覆盖（约20-40％），因此植被无法有效地防止风侵蚀。然而，一旦降水超过该阈值，植被的砂保留功能将增强，从而降低土壤损失基本上。植被覆盖具有控制风蚀的较低和较高阈值。低于10％的植物盖几乎没有降低土壤表面的风速。植被在减少风蚀的影响基本上达到植物覆盖率为40％或更高的最大值。应考虑降水对干旱地区植被覆盖的约束影响，以提高旨在缓解和预防土壤损失的造林和重新造林努力的效率。

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