北京地区等高草篱防治坡耕地水土及氮磷流失效果研究.PDFVIP

24 6 Vo l. 24 No . 6 20 10 12 J our nal of Soil and W ater Conserv ation Dec. , 20 10 1 1 2 2 喻定芳 , 戴全厚 , 王庆海 , 肖 波 1. , 550025 ; 2 . , 100097) : , 5% , 10 % , 15% , 20% ) , , , , , 73% 86% , 76% 88% ; , 54 % 64 % , 55% 63% , : ; ; ; ; : S 157. 1, S157 . 4 3 : A : 2010) 0600 1105 Effects of Contour Grass Hedges on Soil, Water and N, P Nutrients Loss on Sloping Croplands in Beijing 1 1 2 2 Y U Dingf ang , DA I Quanhou , WA N G Qinghai , X IA O Bo ( 1. Colleg eof Forest, Guiz hou Univ ersity , Guiyang 550025; 2. Research Dev elop ment Centerf or Grasses and nvironment, Beij ing A cademy of A griculture and Forestry Sciences, Beij ing 100097) Abstract: T he decreasing eff ect s o f P enniset um Pennisetum alop ecuroides L inn . ) Spreng . ) and A rundinel l a A rundinella hirta T hunb . ) C. T anaka) g rass hedges on t he lo ss of so il, w ater and N , P nut rient s w er e st udied under nat ural rainf all on fallow lands w it h dif ferent slope g radient s 5% , 10 % , 15% , 20% ) . T he result s show ed t hat t he loss of runof f and sedim ent s and N , P nut rient s w ere signif icant ly r educed by A rundinella and P enniset um hedges. T hese reducing eff ect s of t w o g rass hedge g radually decreased w it h t he increase of slo pe g radient . In addit ion, t he Penniset um hedg es w as muc