摘要
通过对川中丘陵区几次暴雨过程氮、磷流失的观测与分析,研究了不同降雨侵蚀力条件下的紫色土坡耕地的养分流失特征。结果表明在产流初始阶段,氮、磷流失严重,径流中养分输出浓度比较高,总氮最大可达8.0 mg/L左右,总磷在1.9 mg/L左右;坡耕地养分流失与土壤侵蚀的关系密切,氮、磷迁移以泥沙吸附态迁移为主,径流中的颗粒态氮、磷含量随降雨侵蚀力增大而增大,而溶解态氮、磷含量与降雨侵蚀力无明显相关。
The characteristics of nutrient loss from slope cropland of purple soil under different rainfall erosivities were studied from several rain-storm processes in the central Siehuan Basin. The results showed that the main lost nutrient happened at the beginning of the runoff. The highest concentration of total N and total P exported in runoff was as high as 8.0 mg/L and 1.9 mg/L respectively. There was significantly positive correlation between the rainfall erosivity and the amounts of particulate form which was dominative in the lost nutrient of surface runoff; while dissolved nutrient in runoff was not interrelated with the rainfall erosivity.
出处
《水土保持研究》
CSCD
北大核心
2006年第6期139-141,144,共4页
Research of Soil and Water Conservation
基金
中国科学院知识创新工程重要方向性项目(KZCX2-413和KZCX3-SW-330)资助
关键词
紫色土
坡耕地
暴雨
养分流失
降雨侵蚀力
purple soil
slope cropland
rain-storm
nutrient loss
rainfall erosivity
