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Effect of shrub-grass vegetation coverage and slope gradient on runoff and sediment yield under simulated rainfall
International Journal of Sediment Research ( IF 3.6 ) Pub Date : 2020-06-03 , DOI: 10.1016/j.ijsrc.2020.05.004
Dandan Han , Jingcheng Deng , Chaojun Gu , Xingmin Mu , Peng Gao , Jianjian Gao

Evaluating the benefits of sediment and runoff reduction in different vegetation types is essential for studying the mechanisms of soil and water conservation on the Loess Plateau. The experiment was conducted in shrub-grass plots with nine levels of mixed vegetation coverage from 0% to 70%, three slopes (10°,15°, and 20°) and two rainfall intensities (1.0 and 2.5 mm/min). The results showed that the vegetation coverage and slope gradient significantly affect runoff and sediment yield. Shrub-grass vegetation coverage had a significant effect on the runoff start-time, runoff flow velocity, runoff rate, and soil erosion rate on hillslopes. Mixed vegetation coverage could effectively delay the runoff start- time and decrease the runoff flow velocity. However, the effects of the slope gradient on runoff and sediment yield are opposite to those of vegetation coverage. Shrub-grass vegetation coverage could effectively increase runoff and sediment yield reduction benefits, while their benefits were affected by the rainfall intensity. At the 1.0 mm/min rainfall intensity, the reduction in the sediment production rate was greater than that under the 2.5 mm/min intensity. However, when the shrub-grass vegetation coverage exceeded 42%, the runoff reduction benefit was more obvious at higher rainfall intensities. The cumulative sediment yield increased with increasing cumulative runoff, and the rate of increase in the cumulative runoff was greater than that of the cumulative sediment yield with increasing of shrub-grass vegetation coverage. Moreover, there was a power function relationship between cumulative sediment yield and cumulative runoff yield (P < 0.05). Our paper is expected to provide a good reference on the ecological environment and vegetation construction on the Loess Plateau.



中文翻译:

模拟降雨条件下灌草植被覆盖度和坡度对径流和产沙量的影响

评估不同植被类型的沉积物和减少径流的效益对于研究黄土高原水土保持机制至关重要。该实验是在灌木草地中进行的,该草地有9种水平的混合植被,覆盖率从0%到70%,三种坡度(10°,15°和20°),两种降雨强度(1.0和2.5 mm / min)。结果表明,植被覆盖度和坡度对径流和产沙量有显着影响。灌木草植被覆盖率对山坡径流开始时间,径流流速,径流速率和土壤侵蚀速率有显着影响。混合植被覆盖可以有效地延迟径流开始时间并降低径流流速。然而,坡度对径流和产沙量的影响与植被覆盖相反。灌木草的植被覆盖可以有效地增加径流量和减少泥沙的收益,而其收益却受降雨强度的影响。在降雨强度为1.0 mm / min的情况下,沉积物生产率的下降幅度大于在降雨强度为2.5 mm / min的情况下。但是,当灌木草植被覆盖率超过42%时,降雨强度越高,径流减少的好处就越明显。随着灌木丛草植被覆盖度的增加,累积泥沙产量随累积径流量的增加而增加,累积径流量的增加率大于累积泥沙产量的增加率。此外,P  <0.05)。我们的论文有望为黄土高原的生态环境和植被建设提供参考。

更新日期:2020-06-03
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