中国水土保持科学2017，Vol.15Issue(4)：68-77,10.DOI:10.16843/j.sswc.2017.04.009
不同覆盖红壤坡地磷素随径流分层输出的特征
Characteristics of phosphorus output through runoff from different soil layers by different land cover treatments in red soil slopes
摘要
Abstract
[Background] Phosphorus from the runoff migration is one of the sources of non-point source pollution because of slope agriculture development,which is also a potential threat to the groundwater environment.The most important reason of water eutrophication is the input of external phosphorus.The migration and output process of phosphorus from the soil of slopes to water is not only the focus of soil science research,but also one of the resource and environmental problems that needs to be solved urgently.[Methods] In Jiangxi Provincial Eco-Science Park of Soil and Water Conservation,Drainage Lysimeter was used to study the characteristics of phosphorus output through runoff from different layers under natural rainfall conditions in red soil slopes.Three 5 × 15 m plots with slope of 14° were established by three land cover treatments which were Paspalum notatum Flugge coverage,P.notatum Flugge litter mulching and bare land.There were four discharge outlets used to collect surface runoff,30 cm interflow,60 cm interflow and 105 cm underground runoff in each plot.Runoff samples were collected and analyzed for the content of phosphorus during the three natural rainfall events process in 2013 and 2014.[Results] 1) The total phosphorus (TP) concentration migrating through runoff decreased sharply with the increase of soil depth.The proportion of dissolved phosphorus (DP) to TP was high and stable,which was the main form of phosphorus output through runoff.2) Output amounts of TP through runoff in three treatments decreased gradually from bare land,litter mulching to grass coverage.Under the three storm conditions,the total reduction rate of TP and DP was 35％-92％ and 44％-96％ respectively by grass coverage treatment,and 9％-86％ and 0-89％ respectively by litter mulching treatment.3) The proportion of TP through the surface runoff reached more than 90％.The proportion of TP through interflow was relatively small of the three treatments.The proportion of TP through underground runoff which reached more than 60％ was the main mode under the treatments of hay mulching and grass planting.[Conculsions] In the development of agriculture and forestry in the red soil slope,the vegetation cover and mulching measures may reduce the phosphorus pollutant into the water body.These findings hold important implications for soil and water loss and non-point source pollution control.关键词
红壤坡地/磷素输出/不同覆盖/分层/自然降雨Key words
red soil slopes/phosphorus output/different land cover treatments/different soil layers/natural rainfall分类
资源环境引用本文复制引用
张杰,谢颂华,莫明浩,涂安国..不同覆盖红壤坡地磷素随径流分层输出的特征[J].中国水土保持科学,2017,15(4):68-77,10.基金项目
水利部鄱阳湖水资源水生态环境研究中心开放基金项目“鄱阳湖流域坡耕地径流泥沙分配及污染物迁移特征”(ZXKT201501),“外源性有机碳对红砂岩侵蚀劣地土壤改良研究”(ZXKT201502) （ZXKT201501）
国家自然科学基金“红壤坡地水沙分配及其与氮磷的伴生迁移特征”(41461060) （41461060）
江西省青年科学基金“鄱阳湖区坡耕地侵蚀泥沙中氮磷的赋存形态及解吸特征”(20161BAB216148) （20161BAB216148）
