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首页> 外文期刊>Agronomy for Sustainable Development >Grass hedges to reduce overland flow and soil erosion
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Grass hedges to reduce overland flow and soil erosion

机译：草篱减少土地流失和水土流失

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Overland flow and the consequent soil erosion are worldwide problems that are particularly acute in the Chinese Loess Plateau. Negative consequences are in situ erosion and land impoverishment, and even more serious damage such as physical and chemical pollution in downstream areas. Land impoverishment is due to the loss of fertile topsoil with its load of organic matter and nutrients. Nonetheless, the overland flowing water could be beneficial by helping to reduce the drought risk, if it could be controlled and encouraged to infiltrate the soil. Grass hedges are a cheap and effective structure for controlling overland flow and for filtering nutrients and pollutants, but research has mainly focused on their use in tropical, subtropical and Mediterranean environments. Here, two grass species were tested for their ability to reduce overland flow and soil erosion. Simulated rainfall was applied during sets of three 1-h runs to evaluate the effects of protective grass hedges. We tested two different grasses, Pennisetum alopecuroide and Arundinella hirta, under three rain intensities of 14, 22 and 36 mm h(-1), and 5-20% slope gradients on overland flow and soil loss. Plots without grass hedges were used as control. Our results show that grass hedges reduced overland flow by 72% for Pennisetum and by 36% for Arundinella on average. Such native, non-invasive, perennial grasses proved to be very promising for use in conservation practices.
机译：泛滥和随之而来的水土流失是全世界的问题，在中国黄土高原尤为严重。负面影响是原地侵蚀和土地贫困，甚至更严重的破坏，例如下游地区的物理和化学污染。土地贫困是由于肥沃的表层土失去了有机质和养分所致。但是，如果可以控制并鼓励陆地渗透水，则陆上流水可以通过帮助减少干旱风险而受益。草篱是一种便宜而有效的结构，可用于控制陆上水流和过滤养分和污染物，但研究主要集中在热带，亚热带和地中海环境中。在这里，对两种草种减少陆上水流和土壤侵蚀的能力进行了测试。在三个1小时的跑步中套用模拟降雨，以评估保护性草篱的效果。我们在三种降雨强度分别为14、22和36 mm h（-1）以及5-20％的坡度对陆坡流量和土壤流失的情况下，测试了两种不同的草，草狼草（Pennisetum alopecuroide）和野草（Arundinella hirta）。没有草篱的地块用作对照。我们的结果表明，草篱减少了狼尾草的陆路流量平均减少了72％，而Arundinella减少了36％。事实证明，这种原生的，非侵入性的多年生禾草在保护实践中非常有前途。

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