Changes in aboveground biomass of grasssland transect in Inner Mongolia Autonomous Region,China

The plant coenology survey has done in northeast-southwest grassland transect in Inner Mongolia by using method of transect-sample area-quadrat.Then based on the results of both indoor and outdoor investments and measures,the gradient changes of aboveground biomass were analyzed.The main conclusions are as follows:(1) the background biomass along the northeast-southwest transects in Inner Mongolia ranges from 50-80 g·m-2;the value of grassland's aboveground biomass reduced with the change of vegetation type.It shifts from meadow steppe to typical steppe and desert steppe.(2) the total aboveground biomass of grassland has no strict corresponding relation with the land use intensity because of the impacts of human activities such as farming,field's abandoned and returning reclaimed land and forests and so on.But the biomass value of essbar perennation plant is declining with the intensity of land use.(3) using aboveground biomass to evaluate the quality and health of the ecosystem was partly limited.The percentage of biomass value in different land use intensity quadrat and background quadrat could hit the aim of rejecting the impacts of natural geographical area,regional climate background,and could analysis the influence of economic performance and economic structure development on the grassland ecosystem.