从水盐平衡的角度分析控制排水在银南灌区实施的可行性

Feasibility study of adopting controlled drainage in Yinnan irrigation district based on salt and water balance

宁夏银南灌区目前普遍存在排水过量问题。为了减少由此带来的由于农业污染物流失造成的环境问题,控制排水措施可以灵活调节现有系统的排水能力。该文根据控制排水的定义、作用及其适用条件,结合银南灌区的地理条件及其1979～1998年19年的水盐引排状况和水稻不同生育期的耐盐特性,从水盐平衡的角度分析,结果表明目前银南灌区处于脱盐状态且土壤盐分尚未达到作物的耐盐临界值,控制排水技术在银南灌区运用是可行的。

Yinnan Irrigation District widely exists excessive drainage, which poses potential environmental risk downstream. Controlled drainage can be used to reduce the drainage rate for the current system. The feasibility of the application of controlled drainage based on the local weather, geography and soil conditions was studied. The monitoring data during the last 19 years show that the district is in a desalinized state, and the soil salt content from controlled experiment is lower than crop tolerance values. Therefore, adopting controlled drainage in Yinnan Irrigation District is a highly viable option in controlling agricultural pollution.