Tilman D,Wedin D,Knops J.Productivity and sustainability influenced by biodiversity in grassland ecosystems[J].Nature,1996,379:718-720.
[2]
Loreau M,Hector A.Partitioning selection and complementarity in biodiversity experiments[J].Nature,2001,412:72-76.
[3]
Tilman D,Reich P B,Knops J M,et al.Diversity and productivity in a long-term grassland experiment[J].Science,2001,294:843-846.
[4]
Tracy B F,Sanderson M A.Productivity and stability relationships in mowed pasture communities of varying species composition[J].Crop Sci,2004,44:2180-2186.
[5]
Sanderson M A,Soder K J,Muller L D,et al.Forage mixture productivity and botanical composition in pastures grazed by dairy cattle[J].Agron J,2005:1465-1471.
[6]
Provenza F D.Acquired aversions as the basis for varied diets of ruminants foraging on rangelands[J].J Anim Sci,1996,74:2010-2020.
[7]
Tracy B F,Faulkner D B.Pasture and cattle responses in rotationally stocked grazing systems sown with differing levels of species richness[J].Crop Sci,2006,46:2062-2068.
[8]
Soder K J,Sanderson M A,Stack J L,et al.Effects of forage diversity on intake and productivity of grazing lactating dairy cows over two grazing seasons[J].J Dairy Sci,2004,87(Suppl.1):30.
[9]
Soder K J,Sanderson M A,Stack J L,et al.Intake and performance of lactating cows grazing diverse forage mixtures[J].Dairy Sci,2006,89:2158-2167.
[10]
Jones D L,Shannon D,Murphy D V,et al.Role of dissolved organic nitrogen (DON) in soil N cycling in grassland soils[J].Soil Biol Biochem,2004,36:749-756.
[11]
Hooper D U.The role of complementarity and competition in ecosystem responses to variation in plant diversity[J].Ecology,1998,79:704-719.
[12]
Craine J M,Tilman D,Wedin D,et al.Functional traits,productivity and effects on nitrogen cycling of 33 grassland species[J].Funct Ecol,2002,16:563-574.
[13]
Scherer-Lorenzen M,Palmborg C,Prinz A,et al.The role of plant diversity and composition for nitrate leaching in grasslands[J].Ecology,2003,84:1539-1552.
[14]
Oelmann Y,Kreutziger Y,Temperton V M,et al.Nitrogen and phosphorus budgets in experimental grasslands of variable diversity[J].J Environ Qual,2007a,25:396-407.
[15]
Symstad A J,Tilman D,Willson J,et al.Species loss and ecosystem functioning:Effects of species identity and community composition[J].Oikos,1998,81:389-397.
[16]
Liu Z,Groves C,Yuan D,et al.South china Karst aquifer storm-scale hydrochemistry[J].Ground Water,2004,42:491-499.
[17]
Wang K L.Environmental migration and sustainable development-A Case Study of Southwest China[J].Chinese Geographical Science,1998,8:271-280.
[18]
Schmid B,Hector A,Huston MA,et al.The design and analysis of biodiversity experiments[M]// Loreau M,Naeem S,Inchausti P.Biodiversity and Ecosystem Functioning:Systhesis and Perspectives.Oxford:Oxford Univ.Press,2004:61-75.
[19]
Van Soest P J,Robertson J B,Lewis B A.Symposium:carbohydrate methodology,metabolism and nutritional implications in dairy cattle.Methods for dietary fiber,neutral detergent fiber,and nonstarch polysaccharides in relation to animal nutrition[J].J Dairy Sci,1991,74:3583-3597.
[20]
Lambers J H R,Harpole W S,Tilman D,et al.Mechanisms responsible for the positive diversity-productivity relationship in Minnesota grasslands[J].Ecol Lett,2004,7:661-668.
Van Ruijven J,Berendse F.Positive effects of plant species diversity on productivity in the absence of legumes[J].Ecol Lett,2003,6:170-175.
[23]
LeGrand H E.Hydrological and ecological problems of Karst regions[J].Science,1973,179:859-864.
[24]
Caldeira M C,Ryel R J,Lawton J H,et al.Mechanisms of positive biodiversity-production relationships:insights provided by d13C analysis in experimental Mediterranean grassland plots[J].Ecol Lett,2001,4:439 443.
[25]
Fulkerson W J,Neal J S,Clark C F,et al.Nutritive value of forage species grown in the warm temperate climate of Australia for dairy cows:Grasses and legumes[J].Livestock Sci,2007,107:253-264.
[26]
Fulkerson W J,Neal J S,Clark C F,et al.Nutritive value of forage species grown in the warm temperate climate of Australia for dairy cows:Grasses and legumes[J].Livestock Sci,2007,107:253-264.
[27]
Fulkerson W J,Slack K,Hennessy D W,et al.Nutrients in ryegrass (Lolium spp),white clover (Trifolium repens) and kikuyu (Pennisetum clandestinum) pastures in relation to season and stage of re-growth in subtropical environment[J].Aust J Exp Agric,1998,38:227-240.
[28]
White T A,Barker D J,Moorea K J.Vegetation diversity,growth,quality and decomposition in managed grasslands[J].Agric Ecosyst Environ,2004,101:73-84.
[29]
Hobbie S E.Effects of plant species on nutrient cycling[J].Trends Ecol Evol,2004,7:336-339.
[30]
Oelmann Y,Wilcke W,Temperton V M,et al.Soil and plant nitrogen pools as related to plant diversity in an experimental grassland[J].Soil Biol Biochem,2007b,71:720-729.
[31]
Grahama P H,Vance C P.Nitrogen fixation in perspective:an overview of research and extension needs[J].Field Crop Res,2000,65:93-106.
[32]
Spehn E M,Scherer-Lorenzen M,Schmid B,et al.The role of legumes as a component of biodiversity in a cross-European study of grassland biomass nitrogen[J].Oikos,2002,98:205-218.
