Study on the Changes of Grassland Vegetation Coverage in Yihewusu Gacha under Districting Rotational Grazing Way

摘要

In the recently 20 years,grassland vegetation coverage change rapidly in Inner Mongolian Plateau,it both related to global climate change,and also closely related to is social and economic system in Inner Mongolia in the last 30 years.In this paper,Based on the relation between human and land theory as the guide,by using GIS and field survey method,with the Yihewusu Gacha of Abag Banner for research area,to take the four seasons pasture of districting rotational grazing as a unit,analyzes the changes of grassland vegetation coverage in the GaCha nearly 20 years.Results shows that [1]grassland degradation(grassland vegetation coverage decreased);[2]the change of grassland vegetation coverage of districting at a quarter of rotational grazing is different,Vegetation coverage of summer pasture is highest,while the vegetation coverage of winter pasture is lowest.The analysis results showed that at present,"districting at a quarter of rotational grazing" one of more economical and effective method of protection natural grassland and restoration degraded grassland.