The Ecological Water Requirement of Vegetation in Shihezi Based on Remote Sensing
The vegetation ecological water demand has become one of hot issues in optimal allocation of water resources and ecological environment construction.Shihezi reclamation area has been selected as the study area in this paper.Based on the CBERS Satellite Datum in 2008 and the land-use map in 2003,the vegetation types were classified by using remote sensing image processing technique.The area change of every type was analyzed by using transfer matrix.Then the amount of vegetation ecological water demand can be gotten by quota.Through analysis of the spatial changes of vegetation ecological water demand,the result shows that the water requirement in cultivated land is the biggest,that in grassland takes the second place,and that in forest is the least.Moreover,the nearer to the core of oasis,the more the vegetation ecological water demand.This indicates that the water demand in cultivated land occupies the largest part.So conversion of cropland to forest,replacing cropland with pasture and using water saving irrigation are very important to alleviating the supply and demand contradiction of water in Shihezi reclamation area.