The impact of different land use and management on community composition,species diversity and productivity in a typical temperate grassland

This article discusses the community differences including community composition,species diversity and productivity between six land use and manage patterns(fenced Stipa grandis lawn,fenced Leymus chinensis lawn,public grazing lawn,private grazing lawn,fired and fenced S.grandis lawn and artificial forage) in a typical tempered grassland in Xinlin Gol.The comparison was aimed to find out and to understand the influences and their mechanism that grassland use methods would bring to the community.Results were obtained by community investigation,and measurement of aboveground biomass and belowground biomass using harvest method and soil auger method in each plots.The above and below ground biomass decreased in grazed communities,and significantly increased in long-term fenced communities(P0.05);but being fenced or not didn't remarkably affect the community composition or species diversity.With the weakening of the grassland usage,the productivity and proportion of C3 plants gradually increased(P0.05),the productivity of C4 plants remained steady and its proportion decreased.The past fire raised the species diversity and productivity and proportion of the C4 plant in the community in the grassland communities(P0.05),significantly reduced the below ground biomass(P0.05),and increased,but had rarely effect on the above ground biomass.The forage reclamation of grassland severely changed the community composition,significantly reduced the below ground biomass,but largely raised the above ground biomass,consequently resulting in higher the above/below ground biomass ratio compared to any surrounding natural grassland communities.