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| Nitrogen Removal Via Denitrification from Eutrophic Water as Influenced by Eichhonia crassipes and Sediment |
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| KeyWord:eutrophic water; water hyacinth; nitrification; denitrification; N2O and N2 emission |
| Author Name | Affiliation | | MA Tao | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjng 210014, China
College of Resources and Environment Sciences, Nanjing Agricultural University, Nanjing 210095, China | | ZHANG Zhen-hua | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjng 210014, China | | YI Neng | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjng 210014, China
College of Resources and Environment Sciences, Nanjing Agricultural University, Nanjing 210095, China | | LIU Xin-hong | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjng 210014, China | | WANG Yan | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjng 210014, China | | YAN Shao-hua | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjng 210014, China | | GAO Yan | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjng 210014, China |
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| Abstract: |
| Nitrogen gas（N2） is believed to be the main gaseous product of nitrification and/or denitrification occurred in eutrophic water. Total removal of N2 and N2O from eutrophic water with or without cultivation of water hyacinth（Eichhonia crassipes） was investigated using an improved floating-chamber method to directly measure N2 and N2O emission from water. Under the high concentrations of N（NH+4-N：6.0~7.2 mg·L-1; NO-3-N：0.81~5.14 mg·L-1; TN 8.9~12.07 mg·L-1）, growing E. crassipes without sediment removed（1 609.1±303.4）~（2 265.2±262.6）mg N from the water, accounting for （63.2±17.0）% of the total N loss from the water. However, only（23.7±3.1）%~（28.7±4.8）% of the total N loss was from N uptake by E. crassipes. In the treatments without E. crassipes or sediment, N2 emission[（689.0±29.2）~（1 142.9±17.5）mg N2-N] accounted for（40.7±8.6）%~（43.6±0.8）% of total N loss from the water. Applying sediment to the water further increased N2 emission via nitrification and/or denitrification. Interactions between E. crassipes and sediment were significant（P<0.01）. In general, N2 produced in the water was significantly higher（P<0.05） with than without E. crassipes. The findings suggest that cultivation of Eichhonia crassipes had a stimulation effect on denitrification process in eutrophic water. |
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