RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (Z1): 50-58.doi: 10.11870/cjlyzyyhj2016Z1008

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COMPARISON OF ROOT SYSTEM GROWTH AND BIOMASS ALLOCATION BETWEEN WATER TANK AND RIVER EXPERIMENT FOR WATERCRESS (OENANTHE JAVANICA (BLUME) DC) FLOATING BED

XIN Zai-jun1,2, LI Xiu-zhen1, JIA Yue1, GUO Wen-yong1, SUN Yong-guang1   

  1. 1. Stake Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;
    2. Poyang Lake Research Center, Jiangxi Academy of Sciences, Nanchang 330096, China
  • Received:2015-12-02 Revised:2016-04-28 Online:2016-11-26
  • Supported by:
    Scientific Research Foundation for Doctors,Jiangxi Academy of Sciences(2013-YYB-6);Project of State Key Laboratoty of Estuarine and Coastal Research,East China Normal University(2010RCDW08)

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Abstract: We conducted comparative experiment for watercress floating bed between water tank and river to investigate the difference in root growth and biomass distribution. The water in tank was pumped from the river. We aimed to explore the difference in plant growth between controlled experiment and practical application of watercress floating bed. The results showed that:Most root parameters of watercress showed an exponential increase trend in river and water tank while average root diameter showed decreases trend with time. Total root length, total root surface area, number of root branch, and number of root overlaps were all significantly higher in tanks than in river (p<0.05). The root mass of watercress in tanks showed a faster growth speed than the above water biomass which is contrary to the growth speed between above and under water biomass in river. The crown-root ratio showed a downward and then upward trend with time. But the rate of change in tanks is smaller than that in river. The above founding indicates that watercress in the tanks may be faced with nutrient limitations, which can result in overestimation of nutrient removal of watercress floating bed root system in river.

Key words: watercress floating bed, biomass allocation, root

CLC Number: 

  • X522
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