草业学报2017，Vol.26Issue(4)：53-62,10.DOI:10.11686/cyxb2016350
三种牧草对三峡库区旱坡地氮磷养分流失的影响
Effects forages on nitrogen and phosphorus loss from sloping land draining into the Three Gorges Reservoir
摘要
Abstract
The research was conducted in a small catchment,Wangjiagou,draining into the Three Gorges Reservoir.We combined field experiments and laboratory analysis;corn was used as the control (T1),which was compared to Lolium perenne (T2),Purusfrumentum (T3) and Sorghum bicolor (T4).Samples of the surface runoff after rainfall from May to August in 2015 were collected and analysed for nitrogen (N) and phosphorus (P) allowing losses to be calculated.The results showed that all three forages significantly reduced N and P losses both in the runoff and the sediment.The most effective species was P.frumentum;N and P losses caused by natural rainfall occurred mainly in sediment which accounted for 76.34％-79.97％ and 81.69％-83.90 ％ of total N and total P losses,respectively.The fresh and dry biomass yields of L.perenne and P.frumentum were higher than corn,the mean advantage being 4.45 and 1.52 times,and 4.89 and 1.53 times that of corn,respectively.The nutrient sequestration effect of the four crop types were ranked T2,T3＞T4＞T1.The nutrient sequestration and feed economic benefits of P.frumentum indicate that it has the greatest potential as a substitute for corn in Three Gorges Reservoir catchments,followed by L.perenne.关键词
三峡库区/旱坡地/牧草/养分流失/小流域Key words
Three Gorges Reservoir/dry sloping land/forages/N and P losses/small catchment引用本文复制引用
苟桃吉,高明,王子芳,刘彬彬,黄容..三种牧草对三峡库区旱坡地氮磷养分流失的影响[J].草业学报,2017,26(4):53-62,10.基金项目
十二五国家科技支撑计划课题(2012BAD14B18)资助. （2012BAD14B18）
