3种湿地植物构建的浮床系统修复富营养化水体的效果研究

Studies on Mediation of Eutrophic Water Using Artificial Floating-Beds System Established with Three Wetland Plants

采用人工浮床法研究了3种湿地植物野生稻Oryza rufipogon、香根草Vetiverial zizanioids和风车草Cyperus alternifolius构建的浮床系统对富营养化水体的净化效果.结果表明:3种植物在试验水体中均能较好地生长,并能有效降低水体总悬浮物和叶绿素a含量,其中,香根草和风车草的效果较好.水体溶解氧则先降低后迅速回升,并显著高于对照,其中以风车草的增氧效果最好.3种植物对水体中总氮和总磷均有良好的去除效果,野生稻、香根草和风车草对富营养化水体的最大N去除率分别为71.3%、82.3%和83.7%,最大P去除率分别为74.9%、89.3%和85.6%.综合来看,3种湿地植物中风车草修复能力最强,香根草次之,野生稻最弱.

Using artificial floating-beds system,three wetland plant species（Oryza rufipogon,Vetiverial zizanioids and Cyperus alternifolius） were chosen to study their effects in the mediation of eutrophic water.The results showed that all the plants grew well in eutrophic water.After treated with three plant species,total suspended solids（TSS） and Chl a concentration of eutrophic water reduced significantly.V.zizanioids and C.alternifolius had better effects than O.rufipogon.Dissolved oxygen（DO） concentration decreased at the beginning and then increased rapidly during the experiment.The oxygen enhancement ability of C.alternifolius was the best among three plant species.In addition,three plant species could significantly reduce the content of total N（TN） and total P（TP） of eutrophicated water.Maximal TN removing efficiency of O.rufipogon,V.zizanioids and C.alternifolius were 71.3%,82.3% and 83.7% respectively,maximal TP removing efficiency were 74.9%,89.3% and 85.6%.In summary,the purification ability of C.alternifolius was the best,V.zizanioids was the second.