土著湿生植物对富营养化水体的净化效果研究

Study on effect of purification from indigenous wetland plants for eutrophic water

研究了虎耳草、石蒜和小婆婆纳3种杭州土著湿生植物在富营养化水体中的生长及对水体的净化效果。结果表明:试验植物完全可以水中悬浮生长且生长好。生物量测定发现,植株越大其生物量增加越大,植株越小其净增加生物量越大;经定植植物处理的景观湖水水质明显比对照组的水质要好,透明度提高幅度大,Chl-a浓度急剧下降,CODCr明显降低,TN和TP的去除效果明显,DO也能维持在合适范围。

The growth in eutrophic water and the purification effects of three indigenous wetland plants （ Saxifraga stolonifera, Lycoris, Veronica serpyllifolia） in Itangzhou are studied herein. The result shows that all the tested plants can suspendedly grow in water with better growth status. The relevant biomass measurement finds out that the bigger the plant is, the more the increment of the biomass are, while the smaller the plant is, the more net increment of the biomass are. Therefore, the quality of the water in landscape lake after the treatment with the permanent planting concerned is surely better than that of its compared one with the largely enhancement of the transparency, great decrease of the concentrations of Chl - a, obvious reduction of CODcr and remarkable effect of removal of TP and TN, and then DO can be also kept on a certain satisfied level.