黄丘一区坡面水土流失规律研究

<正> 为了探索黄丘—区坡面水土流失规律,寻求水土流失与其影响因素之间的关系,为合理利用水沙资源、水土保持规划与措施设计提供科学依据,我们进行了该项试验研究。 一、径流场布设概况 1954～1958年,我们在绥德辛店沟布设径流小区,由9个逐步发展到66个;1958～1961年,径流小区缩减为8个;1962～1964年,在韭园沟内王茂庄大咀峁布设自然地貌全坡长径

Study on Law of Soil Loss from Slope Surface in the First Subregion of Gullied Hi- lly Loess Region

Followed an introduction of the layout of the runoff plots ,this paper emphatically analyses the effect of rainfall,gradient and length of slope, and vegetation cover on soil loss from slope surface in the first subregion of gullied hilly loess region.The study indicates that the annual average erosive rainfall in the area is 129 mm with an annual variation of 5 % -70% .The maximum rainfall in an interval of 15 minutes has close relations with the amount of soil loss.The correlation between the slope gradient and annual mean amount of eroded soil is obvious and the maximum value occurs at about 28 degrees.The form of erosion varies with the gradient.The length of slope without obvious erosion is generally less than 10 m.Surface erosion mainly occurs on the slope 20-60 metres in length.Annual runoff and erosion modulus have negative linear relations with vegetation cover .Based on the experimental data, the author proposes an equation to predict the soil erosion from slope surface of the studied subregion.