Study On The Erosion Law Of Red Soil During Simulated Rainfall

Soil erosion and river jam, flooding, nutrient losses, soil degradationcaused by erosion have greatly endangered the sustainable growth ofagriculture.It is urgent to study and find an effective way to control soilerosion through scientific research. By working under the condition ofartificial precipitation and employing the indoor analytical method, westudied erosion process in different slopes (5°,10°,15°,20°) and underdifferent coverage rates. In the mean time, we also made a comparativestudy of the erosion regularity among red soil, loessal soil. The mainresults are as follows:1.Coverage rate is an important factor that causes soil loss. The runoffdecreases as the coverage rate increases, and the more the coverage rateincreases the more we will have the effect in question. When the coveragerate increases from 0 to 50%, the range of the soil loss in slopes of 15°or 20°was bigger than 5°or 10°. While the coverage rate increases to100%, the reducing sand domino effect is not as obvious as when theslope is 5°or 10°. It means that we still can achieve the purpose ofreducing water and sediment as we adopt coveting.on upside half of theslope.2.The erosion process is affected by the raindrop kinetic energy deeply.The relationship between runoff yield and sediment yeild are powerfunction with 100% coveting. But the fit curve is not evident under thecondition of covering 0 and 50%.3.The amount of soil erosion and the coverage rate submitted to indexrelation.It shows that the amount of erosion will decrease massively asthe coverage rate increases.4.The soil texture was the key factor influencing the amount of soilerosion. The erosion of red soil was much less than that of loessal soil.After diminishing raindrop kinetic energy by coveting treatment,the sediment yield decreases, and the reducing range in red soil was bigger than that in loessal soil. It was probably because that the red soilthat contained some thick sands Had not be sieved.5.The red soil is obviously different from the loessal soil in theprocesses of producing runoff and sand. The runoff of loessal soilgradually becomes a steady flow after quite some time, while the curve ofproducing runoff on the part of red soil always fluctuates, which isprobably a result of the changing of the soil surface structure in theprocess of erosion.By using gauze to substitute vegetation, this research manages tosimulate how the surface vegetation influences the process of soilerosion,and offers important theoretical evidence for simulating theerosion process.However, using gauze to substitute vegetation causescertain gap between the experimental result and that of the real situation.Accordingly, it is necessary to make further research and adjustment inthe future.