| In terms of the reality of farmland water uses in the southern part of the Hebei plain and with the help of AreGis, the paper quantitatively establishes the model of linear algebra to estimate and analyze the farmland water uses of different counties in the Hebei plain in temporal and spatial manners, and then discusses the effects of the irrigation modes and the irrigation guaranty rates on the farmland water uses in combination with the actual water uses of these counties; meantime, it estimates and analyze the amounts of the saved water in these counties provided that the current crop patterns remain unchanged. The results shows that the farm water uses tend to increase, the irrigation guaranty rate exerts relatively strong influence on farmland water use, and thus proposes that the water-saving demonstration bases be set up in the regions with highly fluctuated farmland water uses and high water-saving potential and then be extended to other regions. |