Growth Response of Kobresia humilis to Grazing Disturbance on Alpine Meadow

The paper studied the change of tillers,ramet,stalk and area of Kobresia humilis genet in different size and different grazing intensity.The results showed that moderately grazing was benefit to increasing of ramets.Overgrazing and lightly grazing can not stimulate shaping of ramets.Lightly grazing for a long time was benefit to Kobresia humilis to tiller.Mean stalks of different size genets did not indicate significant difference after 5 years grazing.Tillers of big genet decreased significantly if overgrazing for a long time.Stalk number had less effect from grazing intensity.The number of ramets and area of big genet were much than of other treatment significantly in the 6th year of moderately grazing.The number of ramets of moderate genet increased significantly in the 3rd year of overgrazing.Its reproduction growth showed a not sensitive response to grazing intensity.Its area increased significantly when longer lightly grazing.The number of ramets of small genet increase significantly under the condition of grazing.The ability of tiller of small genet had a less effect on grazing intensity.Stalk and area of small genet were both increased significantly in the 6th year and had not significantly difference between among grazing treatment.