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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Fragmentation of soil aggregates induced by secondary raindrop splash erosion
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Fragmentation of soil aggregates induced by secondary raindrop splash erosion

机译：二次雨水飞溅侵蚀诱导的土壤骨料的碎片

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摘要

The particles of soil splashed by raindrops are dispersed and broken again or more, which can be called secondary raindrop splash erosion. To determine the effect of secondary raindrop splash erosion on the fragment size distribution and fragmentation of soil aggregate, Lou soil, a typical cropland soil of the Loess Plateau, was selected to compare the characteristics of the fragment size distribution of soil aggregate between the secondary raindrop splash test (SR) and the without secondary raindrop splash test (WSR) under five different raindrop diameters (2.67-4.05 mm) and at five splash distances (0-50 cm). The results showed that on the whole, the mass percentages of the fragment size > 0.053 mm of the WSR test were 1.13-1.39 times that of the SR test, but the mass percentage of the fragment size < 0.053 mm was 0.83 times that of the SR test, which indicated that the secondary raindrop splash erosion can break the aggregate into finer particles. Under the condition of the five raindrop diameters or the five splash distances, when the fragment size was > 0.053 mm, the mass percentages of splashed aggregates showed a fluctuating variable trend with decreasing fragment size, and the mass percentages of fragment size < 0.053 mm were 4.08%-43.20% or 11.79%-17.18% significantly lower in the WSR test than in the SR test, respectively (P < 0.05). These results indicated that alcohol can protect fragment size > 0.053 mm at each raindrop diameter or splash distance. The fractal dimension (D) of the aggregates in the WSR and SR tests showed a downward opening parabolic relationship with raindrop diameters, and the values of the fractal dimension (D) of the SR test were higher than those of the WSR test for the same raindrop diameter. When the raindrop diameters were 3.64 and 3.74 mm, the values of D in WSR and SR tests were at their maximum, which meant the lowest protective effect of alcohol on the aggregates and the largest degree of fragmentation, respectively. The above research shows that the secondary raindrop splash erosion will cause the soil aggregates to break again, which will lead to the decline of soil fertility and reduce the productivity of the soil.
机译：通过雨滴溅的土壤颗粒分散并再次破裂，可以称为次级雨水飞溅侵蚀。为了确定二次雨滴飞溅侵蚀对土壤尺寸分布和土壤骨料碎片的影响，选择了黄土高原的典型农田土壤，比较了二次雨滴之间土壤骨料分布的特点在五种不同的雨滴直径（2.67-4.05mm）和5个溅射距离（0-50厘米），飞溅测试（SR）和没有次级雨滴飞溅试验（WSR）。结果表明，整体上，片段大小的质量百分比> 0.053mm的WSR试验的SR试验的次数为1.13-1.39倍，但片段尺寸<0.053mm的质量百分比为0.83倍SR试验，表明二次雨水溅射腐蚀可以将骨料分成更精细的颗粒。在五个雨滴直径的条件下或五个飞溅距离的情况下，当片段尺寸> 0.053mm时，溅聚集体的质量百分比显示出碎片尺寸减小的波动可变趋势，片段大小的质量百分比<0.053mm在WSR试验中分别比SR试验中4.08％-43.20％或11.79％-17.18％显着降低（P <0.05）。这些结果表明，酒精可以在每个雨滴直径或飞溅距离处保护片段尺寸> 0.053mm。 WSR和SR测试中的聚集体的分形尺寸（D）显示与雨滴直径的向下开口抛物线关系，SR测试的分形尺寸（D）的值高于相同的WSR测试的值雨滴直径。当雨滴直径为3.64和3.74 mm时，WSR和SR测试中的D值分别为其最大值，这意味着醇对聚集体和最大程度的破碎程度的最低保护作用。上述研究表明，二次雨滴飞溅侵蚀将导致土壤聚集体再次破裂，这将导致土壤肥力的下降，降低土壤的生产力。

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