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选渭北旱原东部合阳县甘井镇为试验地,以研究天然降雨和坡度对黄土高原土壤侵蚀以及土壤养分流失的影响。研究区的径流小区被设置为5°、10°、15°3个坡度的坡面,采用径流场观测法,对一定降雨条件下的产流产沙量以及土壤养分流失量进行测定研究。实验结果表明:在相同坡度的径流小区中,产流量、产沙量以及土壤养分的流失量均随着降雨量的增加而增加;相同降雨条件下不同坡度的径流小区,产流产沙量随着坡度的增大而持续增加,并且5°～10°的变化程度大于10°～15°的变化程度,土壤养分流失也随着坡度的增加而增加。
The experiment was conducted in Ganjing Town of Heyang County in the eastern part of Weibei Upland to study the effects of natural rainfall and slope on soil erosion and soil nutrient loss in the Loess Plateau. The runoff plots in the study area were set to slope of 5 °, 10 ° and 15 °. The runoff and field measurements were used to study the runoff and sediment yield and soil nutrient loss under certain rainfall conditions. The experimental results show that the runoff yield, sediment yield and soil nutrient loss both increase with the increase of rainfall in runoff plots with the same gradient. The runoff yield of runoff plots with different slopes under the same rainfall conditions The slope of 5 ° ~ 10 ° changes more than 10 ° ~ 15 °, soil nutrient loss also increases with the increase of slope.