水土保持通报2016，Vol.36Issue(6)：115-120,6.DOI:10.13961/j.cnki.stbctb.2016.06.019
三峡库区不同坡度石灰土坡耕地磷素流失特征
Characteristics of Phosphorus Loss in Sloping Farmland of Limestone Soil Under Different Gradients in Three Gorges Reservoir Area
摘要
Abstract
[Objective] In order to provide basic data for the prevention of agricultural nonpoint source pollution and the protection of water resources in the Three Gorges Reservoir area,the phosphorus loss in regular lime slope farmland under different gradient was researched.[Methods] A sloping farmland in Xiangxi watershed of Three Gorges Reservoir area was selected and an artificial rainfall experiment with rainfall intensity of 1.5 mm/min was conducted.The variations in surface runoff,sediment concentration,total phosphorus(TP) concentration and other forms of inorganic phosphorus were studied.[Results] As the increase of slope,total runoff and sediment increased,whereas,the initial runoff time decreased.However,no significant impact on the sediment concentration was observed.As runoff continued,both TP and particulate phosphorus(PP) decreased and reached a steady concentration under all slope gradients.PP was the primary form of phosphorus loss,accounting for over 80 ％ of that.The inorganic phosphorus suffered the most severe loss for the phosphorus loss of sediment.The inorganic phosphorus grading tests showed that effective phosphorus and slowly available phosphorus accounted for 54.1％ ～57.8％ of the total amount of inorganic phosphorus.[Conclusion] Slope gradient influenced the phosphorus loss through the impacts on surface runoff and sediment loss.The phosphorus of sloping farmland of limestone soil was mainly removed with the sediment.关键词
三峡库区/石灰土/坡度/磷素/无机磷分级Key words
Three Gorges Reservoir/limestone soils/slope/phosphorus/grading of inorganic phosphates分类
农业科技引用本文复制引用
赵绍林,李晔,赵培培,李波..三峡库区不同坡度石灰土坡耕地磷素流失特征[J].水土保持通报,2016,36(6):115-120,6.基金项目
国家水体污染控制与治理科技重大专项“库区小流域磷污染综合治理及水华控制研究与示范”(2012ZX07104-002) （2012ZX07104-002）
