银北灌区铁三渠区域"土壤水库"初探

为给土壤水库潜力的开发利用提供依据，通过试验研究，对银北灌区铁三渠区域的土壤水动态变化规律和土壤水库进行了初步研究．土壤剖面含水量的变化规律总的来说，自上而下土壤含水量由小到大，逐渐趋于饱和．土壤水库总库容在土壤剖面各层的分配：20cm土层总库容为74．2～92．2mm，随土壤深度的增加而减小；有效水库容为56．8—76．1mm，无效库容为10．3～13．9mm，通透库容为0．1～8．6mm，都随土壤深度呈波动变化．

Research on"soil reservoir"in the Tie San canal area in the irrigation area of north of Yinchuan

This article base on experimental study,preliminary study on dynamic changes of soil water and soil reservoir in the Tie San canal Area.Changes in soil moisture profile of the whole,top-down soil moisture steeled gradually become saturated.The distribution of soil's cross section in soil reservoir is valid reservoir capacity>invalid reservoir capacity>permeate reservoir capacity.The whole reservoir capacity of each layer is from 74.2 mm to 92.2 mm and decease with increase of soil's depth.The valid reservoir capacity of each layer is from 56.8 mm to 76.1 mm,invalid reservoir capacity is from 10.3 mm to 13.9 mm and permeate reservoir capacity is from 0.1 mm to 8.6 mm.All these are change with soil's depth.Moreover,the regulation and transformation of these three-reservoir capacities in"Four Water"conversion are analyzed.