论文部分内容阅读
山东桓台县是个老井灌区,目前全县平均机井密度70亩/眼。过去对浅层地下水进行过量开采,造成地下水位急剧下降,出现吊泵现象。自1970年兴建沟渠河网回灌工程,对地下水进行人工回灌后,地下水位逐步回升,基本上保证了农田供水的需要,粮食产量逐年增加,从1965年亩产234斤,1970年增至503斤,1975年后超过800斤,跨过了“长江”。
Huantai County, Shandong Province is an old well irrigation area, the county average machine density of 70 acres / eye. Over-exploitation of shallow groundwater in the past resulted in a drastic drop in groundwater table and the phenomenon of hanging pump. Since 1970, construction of ditch canal network irrigation project, artificial recharge of groundwater, the groundwater level gradually picked up, basically ensuring the needs of farmland water supply, grain output increased year by year, from 234 pounds per mu in 1965, 1970 increased to 503 pounds, more than 800 pounds after 1975, crossed the “Yangtze River.”