摘要
采用室内模拟降雨装置,研究了三峡库区紫色土在不同雨强和坡度条件下的养分流失规律。结果表明,紫色土坡面流失养分主要由径流和泥沙携带,其中径流养分含量与雨强和坡度无关,但与产流过程一致。泥沙中养分含量与雨强无关,但随坡度增加而降低;泥沙养分含量与产沙量过程无关,但其流失量与产沙量过程一致。泥沙中各养分含量略大于降雨前表土养分含量,远大于径流养分含量,但由于径流中以速效养分为主,故径流携带的养分流失量不容忽视。
With simulated rainfall equipment, the pattern of soil nutrients from purple soil under different rainfall intensities and slopes was studied Results showed that the majority of soil nutrients was removed with runoff and sediment The content of nutrients in the runoff was not interrelated with rainfall intensity and slope, but with the amount of runoff The content of nutrients in the sediment was not interrelated with the rainfall intensities There was negative correlation between the slope and the content of nutrients in the sediment The nutrient loss was in direct proportion to the amount of sediment and runoff The content of nutrients in the sediment was slightly higher than that in the surface soil before rainfall, but exceedingly higher than that in the runoff Because the nutrients in the runoff mainly consisted of available ones, the nutrient loss via runoff could not be neglected
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2003年第1期71-74,101,共5页
Journal of Plant Nutrition and Fertilizers
基金
重庆市科委应用基础项目(410586)
