Effect Of Different Grazing Intensity On The Spring And Autumn Meadow Steppe Of The Stipa Capillata+herbage

Grazing, simple and economic, is one of the primary modes in the utilization of grassland. Any one of the grazing of grassland must regulate the appropriate grazing intensity in order to keep production capability, stabilize and develop ecological system of grassland. In the research, the meadow steppe of stipa capillata+herbage community is selected, in order to discuss the effect on spring and autumn pasture under different grazing intensity,which has scientific,external and exact base on instituting and propelling the reasonable utilizable system for spring and autumn pasture in Zhaosu Horse Farm, Xinjiang.The research results are as followed:(1)With the change of grazing time, the biomass of the gramineous was increasing, so the biomass of the plant community was increased too.When the gramineous wasn't grown at all at fall, the biomass of the plant community was decreasing. The growth of plant community not only was relates to biological characteristic itself, but to rainfall.(2)With the increasing in grazing intensity, the coverage of plant community was decreasing. The coverage of eximious forage (gramineous+cyperaceous+leguminous) was highest under the middle grazing. The dominant varieties of the extreme grazing is Phlomis pratensis, the dominant varieties of the high grazing, middle grazing, light grazing and no grazing is Stipa capillata. The effect of the grazing intensity on biomass of plant community was significant (p<0.05).(3)The percentage of gramineous grasses was the largest on the light grazing, the leguminous was the largest on the middle grazing, the herbage and cyperaceous were largest. The change of the regrowth speed and regrowth biomass is the same in gramineous, cyperaceous and herbage. The regrowth speed of the leguminous was largest under middle grazing.(4)With the increase of grazing frequency, the plant coverage of Stipa capillata community was decreasing in spring, and it didn't change at all in autumn. With the different frequency, the regrowth biomass of plant community, eximious forage and herbage was the highest under extreme grazing in spring. The coverage, height and biomass of the eximious forage were reducing in autumn.(5)Following the change of grazing time, the regrowth speed and regrowth rate of the Stipa capillata is the highest under the middle grazing. In autumn the effect of the grazing intensity was no significant on its regrowth speed, regrowth biomass and regrowth rate (p>0.05).(6)The soil water content in spring is more than in autumn, the water content in soil reduce with extension of the grazing time.