银南灌区控制排水实施效果分析

Implementation effect analysis of controlled drainage in Yinnan Irrigation District

阐述控制排水的定义、作用、适用条件和运行管理要求,以宁夏银南灌区为研究对象,对该灌区水稻田的控制排水试验资料进行分析,试验结果表明:控制排水可以较常规排水抬高地下水位1.8 cm,有效减少50%左右的总排水量和46%左右的地下排水量,在满足水盐平衡的同时,减少了硝氮的排放量,不会对环境造成危害。控制排水在许多国家的应用也取得了很好的效果,所以控制排水技术值得大面积推广。

The definition, effects, applicable conditions and operation management requirements of controlled drainage are described. Using a rice paddy in the Yinnan Irrigation District as the research object, the drainage experiment data axe analyzed. The results show that controlled drainage causes a water table rise of 1.8 cm, the total drainage reduced by 50%, and the groundwater drainage reduced by 46%. This allows a salt-water balance. Also the nitrate nitrogen emission is reduced, preventing harm to the environment. The application of controlled drainage has obvious benefits in many countries, and is worth popularizing on a large scale.