Effect Of Grazing On Vegetation Biomass And Soil Charater In Deyeuxia Angustifolia Meadow Of Sanjiang Plain

This research based on the study of present situation of development use in Sanjiang plain wetland, through different grazing intensity processing, Conduct research on the changes of vegetation cover and phychemical properties of soil, Analysis of the impact of different grazing intensity on the Deyeuxia angustifolia meadow plants and soil properties. Data bases and scientific guidance were provided for the reasonable use of meadow resources in Sanjiang Plain. Results as follows:1. The ground biomass of Deyeuxia angustifolia meadow plant species reached a maximum value in July and minimum in September. As grazing intensity increasing the aboveground biomass reduce. The effect of grazing on different plant populations on biomass accumulation is not consistent.2. The effect on different grazing intensity of plant population growth is different. Deyeuxia angustifolia-, Sonchus brachyotus D C. and Herba cirsii Setosi with grazing intensity increases the growth rate become slowly, moderate grazing can stimulate the growth of Stellaria radians L. Grazing is no much effect on growth of Toraxacum mongolicum Hand.3. Grazing intensity have little effect on total N, total P, total K in0-30cm meadow soil. Grazing intensity have effect on available nutrients in soil0-10cm, but have little influence on10-30cm soil.4. Grazing intensity have influence on soil bulk density in0-5cm. and grazing intensity also affect the other physical properties Within the0-10cm scope of the soil; grazing intensity on physical properties of other soil depth have a weak effect.