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通过实验室风洞研究确定土壤流失、风速与植物茎秆数量、高度及直径的关系.用木钉模拟直立的植被.木钉突出土表,置于风洞中测试用的移动木槽中.试验用木钉直径为3mm或7mm,高为50、150或250mm,数量为每平方米20到400根不等.比较有“植被”的土壤流失与裸地的土壤流失.调节临界状态(Ut)下的自然流速(Uh)及采用木钉密度(N)、直径(D)和高度(H),其方程SL=-3.396+298(Uh+Ut)/√(NDH)就能解释变异为82%的土壤流失(SL).结果指出,即使是稀疏的直立植被也能显著减少土壤流失.
The relationship between soil loss, wind speed, number of stalks, height and diameter of the plant was determined by laboratory wind tunnel research.The wood was used to simulate the erect vegetation.The wooden nails protruded from the soil table and placed in the moving wooden groove for testing in the wind tunnel. The diameter of the test nails is 3mm or 7mm, the height is 50,150 or 250mm, and the number is 20 to 400 per square meter. Compare the soil loss with “vegetation” and soil loss in bare land. Regulate the critical state (Ut ) And the equation of SL = -3.396 + 298 (Uh + Ut) / √ (NDH) can be explained by the natural flow rate (Uh) and the wood density (N), diameter (D) and height (H) 82% soil loss (SL) The results indicate that even sparse upright vegetation can significantly reduce soil erosion.