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Effect of Eichhornia crassipes on production of N-2 by denitrification in eutrophic water

文献类型： 外文期刊

作者： Gao, Yan 1 ; Yi, Neng 1 ; Wang, Yan 1 ; Ma, Tao 1 ; Zhou, Qing 1 ; Zhang, Zhenhua 1 ; Yan, Shaohua 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China

2.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China

关键词： Eutrophication;Macrophyte;Nitrification;Denitrification;N2O and N-2 emission

期刊名称：ECOLOGICAL ENGINEERING （ 影响因子：4.035； 五年影响因子：4.611 ）

ISSN： 0925-8574

年卷期： 2014 年 68 卷

页码：

收录情况： SCI

摘要： The floating aquatic macrophyte may stimulate the gaseous nitrogen production via denitrificaiton in eutrophic water. In order to justify this hypothesis, an improved floating-chamber method was deployed to directly measure the productions of N-2 and N2O from the eutrophic water with or without growth of Eichhornia crassipes. The abundance of denitrifiers attached to E. crassipes root surface and in the water was measured. The interactions between E. crassipes and sediment on mediating N-2 production in eutrophic water were also analyzed. Within the experimental duration of 12 days, the values of N-15 at.% excess of N-2-N were significantly (p<0.05) higher with the growth of E. crassipes than that without. Regardless of added sediment or not, the total removal amounts of N-2 and N2O from the water were significantly (p < 0.05) higher in the planted treatments (4.9-6.7 gN m(-3) without added sediment; 9.8-12.4g N m(-3) with added sediment) than non-planted treatments (2.9-3.4g N m(-3) without added sediment; 3.6-6.0 gN m(-3) with added sediment). The total removal rates of N-2 and N2O from the water were significantly (p < 0.05) higher in the planted treatments (63-71% without added sediment; 161-179% with added sediment) than non-planted treatments (41-44% without added sediment; 79-81% with added sediment). Regardless of plant presence or absence, the total removal amounts and rates of N-2 and N2O from the water were significantly (p < 0.05) higher in the treatments with added sediment than without. The positive interactions (p < 0.01) between E. crassipes and sediment on promoting N-2 production from the water were observed. The presence of E. crassipes significantly promoted the abundances of nosZ (p < 0.05), nirK (p < 0.01) and nirS gene (p < 0.01) in the water. The results indicated that cultivation of E. crassipes could have a stimulating effect on the gaseous production of N-2 by denitrification in the eutrophic water. (C) 2014 Elsevier B.V. All rights reserved.

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