浅埋区地下水--土壤水资源动态过程及其调控

分析了冬小麦生长期地下水-地下水资源量动态过程和地下水、土壤水分变化特征.结果表明,在地下水浅埋区地下水对土壤水的补给为农田蒸散的重要的水分来源,现行的灌溉制度不考虑这一作用,过多的灌溉量不仅会消弱地下术对土壤水的补给,而且多余的土壤水分还会下渗补给地下水,造成水资源的无效损失和动力能源的损耗.为了提高作物水分利用效率,提出了相应的地下水-土壤水资源调控措施.

Variation and Management of Groundwater and Soil Moisture in Agricultural Area with shallow water table

Yucheng county is located in an alluvial plain of the Yellow River, where a shallow groundwater table is prevailing in agricultural area, and water exchanges between groundwater and soil moisture occur frequently and intensively. Effective use of groundwater and soil water is a key countermea-sure for sustainable development of water-saving agriculture and water resources utilization in Yucheng. This paper analyzed the changing characteristics of groundwater and soil moisture resources during the 1998-1999 growing season of winter wheat, from October of 1998 to June of 1999. The results showed that a significant proportion of crop evapotranspiration was met with groundwater.However, the water table contribution was not offen considered in the present irrigation scheduling system, which leads to heavy deep seepage. Several countermeasures for improving crop water use efficiency were put forward in the paper.