The Benefits Analysis Of Grassland Grazing Prohibition In Urumqi City Periphery

Xinjiang is dominated by way of traditional nomadic, overgrazing is the major cause of Xinjiang grassland degradation. Fencing as an important means of ecological restoration has become an important measure to restore and protect Xinjiang grassland. Study on response of vegetation community structure and grassland economic benefits to fencing can provide guidance for understand mechanism of grassland degradation and recovery and making rational use of grassland after enclosure.This study investigated plain desert, mountain desert, plain desert steppe, mountain desert steppe, mountain steppe and lowland meadow rangeland types around Urumqi which has been banned grazing for 3 years, 4 years and 5 years, respectively determined grassland vegetation community structure, height, cover degree and biological volume inside the fence, and calculated their proper carrying capacities and economic benefits after fencing, so as to provide scientific basis for government decision-making. The main results were as follows:1. After 3 years, 4 years, 5 years of fencing, composition of plant community structure of different grassland types did not change significantly. There were differences in the height of the fence plant species that 5 years fencing > 4 years fencing > 3 years fencing. Except lowland meadow, the cover degree of the rest types grassland vegetation were 4 years fencing > 5 years fencing > 3 years fencing.2. Affected by climate variability and location, the biomass of different types grassland on the whole showed that 4 years fencing > 5 years fencing > 3 years fencing. Although grass fence can effectively prohibit livestock ingesting and trampling plants, its impact on vegetation biomass far less than annual climatic fluctuation.3. Proper carrying capacity of mountain desert and mountain desert steppe appeared maximum at 4 years fencing, and minimum of plain desert appeared at 5 years fencing. As fencing time prolong, the proper carrying capacities of mountain steppe and lowland meadow decreased gradually, plain desert steppe had opposite trend that the proper carrying capacities mount to top at 5 years fencing.4. Mountain desert and lowland meadow fencing had the highest economic benefits and reached to maximum at 4 years fencing. Economic benefit of mountain steppe reduced gradually with fencing prolong, however, plain desert steppe showed opposite trend. Plain desert has a minimum economic benefit at 4 years fencing, only 431.75 RMB.5. After comprehensive fencing, different types of grassland had different plant communities and economic benefit, rationally allocated fencing and grazing with utilization(grazing and mowing), then can make pasture prior to continuous grazing in cover degree, height, biomass and other aspects, but the degree of increase was not in direct proportional to fencing time.