河北平原农田用水现状及灌溉方式和保证率对农田用水的影响

针对目前河北南部平原地区农田用水现状,在ArcGIS的支持下,采用定量化的分析方法,通过建立线性代数模型,对河北南部平原各个县近年来的农田用水情况进行估算和时空分析;然后结合河北平原各个县的农田用水实际,讨论灌溉方式和灌溉保证率对农田用水的影响,并在目前作物布局不变的基础上,对不同县的农田节水量进行估算和分析。结果表明农田用水有增加的趋势,灌溉保证率对农田用水影响较大;建议对农田用水变化大、节水潜力大的地区先建立节水示范基地,然后逐步推广到其它地区。

Effects of Current farmland water uses as well as irrigation modes and irrigation guaranty rates on the farmland water uses in the Hebei plain in terms of ArcGIS

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.