Gu Xiaozhi

Effects of transplanting stress on three types of hydrophyte

Transplantation of hydrophytes is an important conduct during the construction of constructed wetland.Transplanting stress could influence the survival ratio and growth of hydrophyte.The change of transplanting stress with time after lifting on Arundo donax,Phragmites communis and Typha latifolia in Lake Nansi,Shandong Province was studied in this paper.The results were as follows:P.communis had the least decrease in biomass and chlorophyll content among the 3 hydrophytes,while the chlorophyll content of A.donax decreased rapidly after lifting.In terms of the chlorophyll fluorescence,A.donax had the largest latent activity (Fv/Fo) of Photosynthesis SystemⅡ(PSⅡ),latent maximum photosynthesis capacity(Y) and light protective capacity (NPQ).T.latifolia had the highest actual photosynthesis efficiency(Φ_(PSⅡ)) synchronously.Photochemical quenching,light protective capacity and actual photosynthesis efficiency of the 3 hydrophytes all decreased to the lowest in 5 hours after lifting. However,the latent maximum photosynthesis capacity reached the lowest after 22 hours.TheΦ_(PSⅡ),Y,qP,NPQ of P.communis andΦ_(PSⅡ),qP of T.latifolia showed remarkable positive correlation with the change of chlorophyll content(P0.01).The results showed that the transplanting stress had great effects on the 3 hydrophytes,and the degree of influence was following as P. communisT.latifoliaA.donax,indicating the plants should be planted in 4-6h,6-8h and 14-16h after lifting respectively, to sustain high survival ratio and natural growth.