地表径流中K、Na流失量分析及其影响因素研究

Analysis on K and Na Losses in Surface Runoff and Study on Its Effective Factors

采用人工模拟降雨装置对密云县农田褐土进行的K、Na流失量试验研究表明 :在相同雨强、坡度条件下 ,K、Na流失量为秸秆覆盖 <草皮覆被 <裸地 ;相同地表状况与坡度条件下K、Na流失量与雨强呈正相关 ;同雨强下泥沙携带的与秸秆覆盖地表下径流水中的K、Na流失量随坡度的增加而增大 ,坡度对裸地和草皮覆被地表径流水携带的K、Na流失量峰值有影响。采用覆盖保护措施对抑制坡地K。

The tests and study on the amount of K and Na losses conducted in drab soil farmlands in Miyun County by utilizing artificial simulated precipitation facilities show that under the same conditions of rainfall intensity and slope, the amount of K and Na losses is stalks cover < turf cover < exposed land; under the same conditions of land surface and slope, the amount of K and Na losses and rainfall intensity are in positive correlation and; under the same conditions of rainfall intensity,the amount of K and Na losses carried out by sediment and that of in surface runoff covered by stalks are increasing as the increase of slopes. Slope affects the peak value of K and Na losses carried by surface runoff under the conditions of exposed land and land with turf cover. Adopting protective measures of cover can effectively control K and Na losses of slope lands.