黄土高原人工锄耕地坡面填洼量特征

Characteristic of Slope Depression Detention of Artificial Hoed Farmland in Loess Plateau

土壤侵蚀与径流有直接关系，而径流直接受填洼量的影响，因此坡面填洼量特征对研究土壤侵蚀机理有重要的现实意义。通过模拟自然地表坑洼填洼量，以人工锄耕为例，探讨了填洼量特征。结果表明：填洼量主要分布在O～40mL范围，随坡度增加填洼量及总填洼量均随之减小；填洼量与坑洼深度和坑洼面积密切相关，其变化规律可用二次抛物线描述；填洼量直接影响坡面径流，填洼量增加，径流强度显著减小。

Soil erosion has direct relationship with runoff, which is directly affected by depression detention. So the characteristic of slope depression detention is important for the study on soil erosion mechanism. Taking artificial hoed farmland as example, the characteristic of depression detention is discussed by simulating that of natural surface depression. The results show that depression detention mainly distributes among 0-40 mL and decreases with the increases of the slope. The depression detention has close relation with depth and area of depression. Its change rule can be described by the second parabola. The slope runoff is directly influenced by depression detention, and the runoff intensity markedly decreases with the increase of depression detention.