Slope gradient has many impacts on soil erosion by water and mineral nitrogen loss in an erosion process.The results from artificial rainfall experiments are as follows.Only in a certain range of slope gradient,the amounts of soil erosion and mineral nitrogen loss aggrandized with the increase in slope gradient.Exceeding the range,however,the amounts of the losses decreased.With the same slope length,the critical slope gradients for soil erosion and mineral nitrogen loss were validated between 15° and 20°.S...
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