Effect Of Rest-grazing On Community Characteristics And Soil Character In Deyeuxia Angustifolia Meadow

Deyeuxia angustifolia of Sanjiang Plain is important wetland resources in China,which isimportant grazing pasture land,has a important role for both of water conservation and thedevelopment of animal husbandry. Nevertheless, in recent years, human use of unreasonablegrazing pastures occur severely degraded.The concentrated expression of that is decline in grassproduction, reduction in forage quality and species diversity and other serious consequences.How torealize resources sustainable in Deyeuxia angustifolia meadow and highest economic benefits hasbecome the most concern problem. In this study, experimental animals is beef cattle, set differentgrazing intensity to explore the grassland communities and soil physical and chemicalcharacteristics of the dynamic changes in the seasonal rest-grazing process, used to evaluate theimpact of different grazing systems on grassland health status. Provide a theoretical basis for therational use of resources of the Sanjiang Plain grassland plants, maintenance the balance of grass,soil and livestock, and promote the sustainable development of animal husbandry.Through seasonal rest-grazing plant community characteristics survey and soil physical andchemical properties analysis of experimental results are as follows:1. After the end of the2012grazing activitiesspecies number of every season’s rest-grazing area are higher than that in prohibit-grazingarea, lower than that in the corresponding grazing control areas.The species number of springrest-grazing sustained increase, meanwhile,that of autumn rest-grazing remain unchanged. Eachsasonal rest-razing will reduce the proportion of perennial grasses functional groups of the share.2. Major construction species Deyeuxia angustifolia population density is the highest in thespring rest-grazing areas under moderate grazing intensity, and coverage is the largest under heavygrazing intensity of spring rest-grazing. Each season rest-grazing relative to grazing to control theheight of the plant populations will increase. Rest-grazing will reduce the important value ofDeyeuxia angustifolia,causing the plant community area to homogenization.3. Rest-grazing can significantly improve the uniformity of the plant community, reduce therichness. The highest diversity in the spring rest-grazing areas for moderate grazing intensity.Simpson index is highest in the summer rest-grazing under heavy grazing intensity.4. Community’s aboveground biomass is the highest reaches2948.1kg/hm2in the spring rest-grazing to heavy grazing,and the lowest in the summer rest-grazing under heavy grazing.5. Rest-grazing no significant impact of20cm below the soil,has impact to the water content,porosity regularity of surface soil. Soil bulk density, organic matter content, nitrogen content are thethe highest in spring rest-grazing under heavy grazing intensity.