| Evaluation of water quality hazard of drainage reuse in Yinbei irrigation district, Ningxia |
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| DOI：10.7606/j.issn.1000-7601.2010.03.08 |
| Key Words: drainage reuse saline-alkaline integrated pollution index mineralization drainage diversion ratio |
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| Abstract: |
| This paper analyzed the water quality of drainage water and saline-alkaline hazard of drainage reuse based
on water quality data of three drainage ditches since 2000 in Yinbei irrigation diatrict, Ningxia. The results showed that every index of drainage water during the irrigation was better than that during the non-irrigation, the integrated pollution indexes were all less than 1.0. The integrated pollution indexes, which were calculated based on irrigation period, had a decreasing trend year by year. The drainage water in the ditches belongs to weak alkaline water with low mineralization during the irrigation, and the annual and inter-annual variations of pH were basically steady. The drainage reuse might bring the potential saline-alkaline hazard for soil. In the regions where there are good drainage and ventilated soil, the saline- alkaline hazard was smaller. |
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