3[1]C.T.Pettigrew,B.J.Hann,L.G.Goldsborough.Feces as a source of nutrients to a prairie wetland[J].Hydrobiologia,1997,362(1-3):55-66.
4[2]J.M.Powell,F.N.Ikpe,Z.C.Somda.Crop yield and the fate of nitrogen and phosphorus following application of plant material and feces to soil[J].Nutrient Cycling in Agroecosystems.1999,54(3):215-226.
5[3]Ryusuke Hatano,Takuro Shinano,et al.Nitrogen budgets and environmental capacity in farm systems in a large-scale karst region,southern China[J].Nutrient Cycling in Agroecosystems,2002,63 (2-3):139-149l.
6[4]Jongbloed,A.W.,N.P.Lenis,Z.Mroz.Impact of nutrition on reduction of environmental pollution by pigs:an overview of recent research.The Veterinary Quarterly,1997,19:130-134.
7[16]Frank J.Dietzl,Nico J.P.Hoogervorst.Towards a sustainable and efficient use of manure in agriculture:The Dutch case[J].Environmental and Resource Economics (Historical Archive),1991,1(3):313-332.
8[17]Terence J.Centner.Developing institutions to encourage the use of animal wastes as production inputs[J].Agriculture and Human Values,2004,21,(4):367-375.
