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| Oxygen and Organic Carbon Releases from Roots of Eichhornia Crassipes and Their Influence on Transformation of Nitrogen in Water |
| Received:March 31, 2014 |
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| KeyWord:Eichhornia crassipes;eutrophication;radial oxygen losses(ROL);organic carbon;nitrogen transformation |
| Author Name | Affiliation | E-mail | | MA Tao | College of Resource and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China
Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | YI Neng | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | ZHANG Zhen-hua | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | WANG Yan | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | GAO Yan | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | jaas.gaoyan@hotmail.com | | YAN Shao-hua | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | shyan@jaas.ac.cn |
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| Abstract: |
| In a simulation experiment, releases of oxygen and organic carbon from roots of E. crassipes were studied at different seedling stages. The concentrations of dissolved oxygen(DO), total organic carbon(TOC), NH4+ and NO3- in eutrophic water were monitored. The plants exhibited high capability to release oxygen and organic carbon. The rate of oxygen release from roots was as high as 56.19、93.15 and 106.32 μmol O2·h-1 and that of organic carbon release as high as 0.25、0.60 and 0.92 mg C·L-1·h-1 at seedling age 1, 2 and 3, respectively, both increasing significantly with age of E. crassipes seedling. However, this order was reversed when the rates were based on the fresh weight of the roots. The removal rates of dissolved inorganic nitrogen from eutrophic water increased with E. crassipes seedling stages. Nitrogen removal from water by E. crassipes was mainly due to nitrogen uptake and assimilation by the plant, and enhanced nitrification and nitrification-denitrification from increased oxygen and organic carbon in water. Hence, E. crassipes made great contribution to efficient and fast removal of the loaded nitrogen in eutrophic waters. |
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