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Growth and decay patterns of riparian Canna glauca and Vetiveria zizanioides

LI Rui-hua1,2; GUAN Yun-tao1,3,4; HE Miao1; HU Hong-ying1; JIANG Zhan-peng1   

  1. 1Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China;
    2School of Environment, Nanjing University, Nanjing 210093, China;
    3Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, China;
    4Cooperative Research and Education Center for Environmental Technology, Kyoto University & Tsinghua University, Shenzhen 518055, Guangdong, China
  • Received:2006-06-06 Revised:1900-01-01 Online:2007-03-15 Published:2007-03-15

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Abstract: 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.

Key words: Genetically Engineered Microorganism, Ecology, Environment