摘要
在自然降雨条件下 ,研究了有、无植被覆盖径流小区红壤坡面周年内产流、产沙及养分流失特征。结果表明 :径流小区产流、产沙量的高峰期与降雨量的高峰期相一致。降雨侵蚀力与降雨量季节分布的不均匀性是由于不同时期的降雨特征和降雨侵蚀力构成因素决定。坡面流失泥沙悬移质养分浓度均高于推移质中的养分浓度。顺坡种植油菜-花生处理 ,坡面流失泥沙钾、磷养分浓度高于休闲裸坡处理。红壤坡面养分以泥沙结合态流失为主 ,但磷、钾以水溶态流失也是一个重要的养分流失途径。流失泥沙悬移质和推移质都有明显的养分富集现象 ,坡面有、无植被覆盖会使流失泥沙养分富集率发生变化。
The properties of runoff and sediment yield and nutrient loss in the runoff plot slope land were studied under rainfal. The result showed, that the fastigium of runoff yield and sediment yield were in accordance with the rainfall fastigium. The rainfall erosion distribution and rainfall seasonal distribution were uneven. The reason was that rainfall and the rainfall erosivity factor in different period were different. The nutrient concentration of bed load of soil ioss was over the sediment load in the slope land. Nutrient concentration of soil loss under covered with vegetation over the fallow. Nutrient concentration are mainly loss by the sediment forms, soluble phosphorus and potassium in runoff are also the important approach of nutrient loss. The nutrient of bed load and sediment load of soil loss both have enrichment tendency, the enrichment ratio of nutrient was changed in two kinds of land use patterns.
出处
《宁夏农学院学报》
2003年第2期3-7,共5页
Journal of Ningxia Agricultural College
基金
国家自然科学基金重点资助项目 (30 0 30 0 30 )。
关键词
红壤
产流产沙
养分流失
降雨侵蚀力
富集率
red soil runoff yield and sediment yield nutrient loss rainfall erosvity enrichment ratio
