Growth and decay patterns of riparian Canna glauca and Vetiveria zizanioides
河岸美人蕉和香根草的生长繁育及其腐烂规律

The study on the growth and decay of Canna glauca and Vetiveria zizanioides in a pilot scale trial of riparian ecosystem restoration showed that both C.glauca and V.zizanioides didn't have strong endurance in deep water.C.glauca did not adapt to the water body in a depth more than 20 cm,but V.zizanioides could grow in deeper water depth.The aboveground biomass of C.glauca and V.zizanioides was 27.5% and 79% more than their underground biomass,and the harvest of their aboveground biomass could remove 59% and 57%of total N and 55% and 57% of total P,respectively.After dunked in water for 130 days,the aboveground part of C.glauca lost 31.89% of its dry mass,49.43% of total N,and 77.30% of total P,while that of V.zizanioides lost 19.8% of its dry mass,47.54% of total N,and 86.06% of total P.The dunking of the plants induced the release of organic materials,N and P,but the concentrations of COD,NH 4-N and TP in water didn't have a persistent increase.