乡土植物对洱海水体的净化效果研究

以灯心草、菖蒲、金针菜、香茶菜4种乡土植物为试材,制成植物浮床,研究4种植物对洱海水体中氮、磷的净化效果。结果表明：4种植物在洱海水体中能保持较强的生命力,试验结束时,其生物量均有显著增加,增长量表现为香茶菜〉金针菜〉菖蒲〉灯心草。4种植物对水样总氮（TN）、总磷（TP）、均有明显的去除效果,4种植物对洱海水体TN的去除率均在65%以上,灯心草、菖蒲、金针菜、香茶菜对水体中TN的去除率分别为69.8%、80.03%、72.60%和85.08%,远高于对照组的去除率（37.10%）,4种植物对水体中TP的去除率分别为74.39%,80.04%,72.88%和78.01%,去除率同样显著高于对照组。试验表明,4种植物对洱海水体均有很好的净化效果,可在今后净化洱海水体水质中推广应用。

Study on the Purification Effect of Indigenous Plants on Erhai Water

In order to screen suitable plants that have the strong purification in Erhai Lake out,four kinds of indigenous plants,Juncus effusus,Acorus calamus,Hemerocallis fulva and Isodon inflexus had been made into the plant floating bed to study their purified effect on nitrogen and phosphorus.It turned out that all four plants could keep their strong life force in the Erhai Lake and their biomass increased obviously.The most increased was Isodon inflexus Hemerocallis;fulva follows and the next was Acorus calamus;Juncus effusus was the least increased plants.All the four plants could remove the TN and TP obviously.The removal rates of TN were over 65%.The removal rates of TN achieved by Juncus effusus,Acorus calamus,Hemerocallis fulva Linn and Isodon inflexus were 69.8%,80.03%,72.60%,85.08%,and all of them were obviously higher than the control(37.10%).And the removal rates of TP was also obviously higher than contrast,which were 74.39%,80.04%,72.88%,78.01% respectively.The examination proved that all of four plants had a good purified effect in the Erhai Lake,so they could be widely used in purifying the water of Erhai Lake in Dali in the future.