再生水灌溉果岭草坪对淋溶水盐分及营养元素的影响

Influence on leaching water salinity and nutritive elements for irrigating green turfgrass with recycled water

使用自来水、二级再生水、三级再生水3种水质灌溉果岭草坪,每月表施草炭与石膏混合物、湿润剂、沙子3种基质,结果表明:淋溶水的pH未呈显著性变化(P>0.05);金属离子(Cu2+、Fe2+、Zn2+)含量只发生小幅变化,差异不显著(P>0.05);表施草炭与石膏混合物下二级再生水浇灌后,淋溶水电导率(EC)为5.83 mS/cm,比自来水、三级再生水浇灌下淋溶水EC分别显著高4.07、3.32 mS/cm,且表施湿润剂和沙子下二级再生水浇灌后淋溶水EC也显著高于自来水、三级再生水浇灌的EC(P<0.05);二级再生水灌溉处理下淋溶水中的Na+、总氮、总磷含量同样有显著性变化(P<0.05)。结果还表明:三级再生水可以长时间灌溉果岭草坪,不会对地表水造成污染;而二级再生水灌溉可能会对地表水产生某些影响,仍需要加强对水质的处理,以减免危害的发生。

The mixture of gypsum and peat, wetting agent and sand were applied every month in green turfgrass, which was irrigated with tap water, secondary recycled water and tertiary recycled at the same time. The results showed that the pH and metalion （Cu2＋、Fe2＋、Zn2＋） content of leachate were not changed significantly （P 〉 0.05）. After applying the mixture of gypsum and peat and irrigating with secondary recycled water, the EC of leachate was 5.83 mS/cm, which was significantly 4.07, 3.32 mS/ cm higher than irrigating with tap water and tertiary recycled water （P 〈 0.05） respectively. The similar result was showed when wetting agent and sand were used as matrix. The concentration of Na＋, total nitrogen and total phosphorus was also changed significantly while irrigating with secondary recycled water （P 〈 0.05）. It also showed that the surface water would not be polluted by irrigating with tertiary recycled water in green turfgrass for long time, however, a potential influence could happen to surface water using secondary recycled water. So the secondary recycled water should be treated further to reduce the hazards.