雨强对黄土区土壤钾素径流流失的影响

Effects of rain intensity on the loss of soil potassium in loess area

通过不同雨强人工模拟冲刷试验,初步分析了雨强对黄土区土壤钾素径流的影响。结果表明,雨强(冲刷强度)增大,溶解态钾质量浓度,溶解态钾、缓效钾和速效钾流失量明显增加;在不同雨强的条件下,缓效钾、速效钾的流失量与坡度呈显著的指数函数关系;雨强对速效钾、缓效钾的富集率影响不大;雨强比坡度对缓效钾和速效钾的流失影响更大。

With the simulative washing test on different rain intensity, the effects of rain intensity on the loss of soil potassium in loess area were preliminarily studied. Results showed that the concentration of dissolved K and amount of dissolved K, rapidly available K, and slowly available K lost in the runoff increase obviously with the increase in rain intensity. With different rain inten-sities, the relationships between slope and amount of the loss of slowly available K and rapidly available K can be expressed obvi-ously by the exponential functions. Rain intensity has little effect on ER of rapidly available K and slowly available K. But rain in-tensity has more effect on the loss of slowly available K and rapidly available K than slope gradient.