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首页> 外文期刊>Journal of Science and Technology of Agriculture and Natural Resources >The Effects of Land Use Change on the Rainfall Erosion Processes in a Marl Soil under Simulated Rainfalls in the West of Zanjan
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The Effects of Land Use Change on the Rainfall Erosion Processes in a Marl Soil under Simulated Rainfalls in the West of Zanjan

机译：Zanjan西部模拟降雨条件下土地利用变化对灰泥土壤降雨侵蚀过程的影响

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Rainfall erosion is the first type of water erosion on the land which is affected by various factors such as land use change and previous rainfall. This study was carried out to investigate the influence of previous rainfalls on the process of rainfall erosion in two marl soils (pasture and that changed to agriculture) under the simulated rainfall. Toward this goal, aggregate samples with the diameters of 6 to 8 mm were randomly collected from the marl areas in the west of Zanjan. Soil aggregates were packed into 48 boxes with the dimension of 30 40 cm to examine the effects of eight rainfall durations with three replications. Eight simulated rainfalls with the duration of 0, 7, 14, 21, 28, 35, 42 and 49 min and a constant intensity of 40 mm h~(-1) were used in the experiment. The soils were exposed to another simulated rainfall with 40 mm h~(-1) in terms of intensity for 15 min to study the rainfall erosion processes. The results showed that the aggregate breakdown was significantly affected by the previous rainfalls in the pasture soil (P<0.01), while there was no significant difference among the previous rainfalls in the case of agriculture soil. Soil compaction and particles splash were significantly affected by previous rainfalls (P<0.05). Aggregate breakdown and particles splash were 1.41 and 1.31 times bigger than their values in the pasture soil. This study, therefore, revealed that the land use change in the mal areas increases the soil vulnerability to rainfall erosion processes. The rate of rainfall erosion processes in each rainfall event depends on the amount of previous rainfall. Increasing aggregate break down and soil water content by the previous rainfall could significantly influence the splash erosion rate in a marl soil.
机译：降雨侵蚀是土地上的第一类水蚀，受土地利用变化和先前降雨等各种因素影响。本研究旨在研究模拟降雨条件下，前两次降雨对两种泥灰土（草场和转为农业）的降雨侵蚀过程的影响。为了实现这一目标，从Zanjan西部的泥灰地区随机收集了直径为6至8 mm的骨料样品。将土壤聚集体装入48个尺寸为30 40 cm的盒子中，以检查八次降雨持续时间，三次重复的影响。实验中使用了8个模拟降雨，持续时间分别为0、7、14、21、28、35、42和49分钟，恒定强度为40 mm h〜（-1）。将土壤暴露于强度为40 mm h〜（-1）的另一模拟降雨中15分钟，以研究降雨侵蚀过程。结果表明，草地土壤的总分解受到前次降雨的显着影响（P <0.01），而对于农业土壤而言，前次降雨之间没有显着差异。土壤密实度和颗粒物飞溅受到先前降雨的显着影响（P <0.05）。牧草土壤中的骨料分解和颗粒飞溅分别是其值的1.41和1.31倍。因此，这项研究表明，麦地区的土地利用变化增加了土壤对降雨侵蚀过程的脆弱性。每个降雨事件中降雨侵蚀过程的速率取决于先前的降雨量。之前降雨增加的骨料分解和土壤含水量会大大影响泥灰土的飞溅侵蚀率。

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