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denitrification in tidal flat sediment, Yangtze estuary

Science China Chemistry 2007年第6期50卷 812-820页

作者： WANG DongQi1,2, CHEN ZhenLou1, XU ShiYuan1, DA LiangJun1, BI ChunJuan1 & WANG Jun1 1 School of Resources and Environment Science, East China Normal University, Shanghai 200062, China 2 School of Life Science, East China Normal University, Shanghai 200062, China School of Resources and Environment Science East China Normal University Shanghai China School of Life Science East China Normal University Shanghai China

Sediment denitrification rates at six Yangtze River estuary tidal flat locations(mudflats and salt marshes)were measured from July 2003 to October *** winter and summer,spatial distribution of denitrification rates was not great in the Yangtze estuary,while in spring and autumn,denitrification rates had a great spatial distribution because of the human activity *** temporal change of denitrification rates was *** ranged from 0.2 to 36.4 umolN·m^(-2)·h^(-1),and were higher in the *** annual average of sediment denitrification rate was 18.2±12.3 mu molN · m^(-2)· h^(-1)in the middle tidal flat and 15.1 ±9.45 mu molN·m^(-2)·h^(-1)in the low tidal flat in the Yangtze *** analysis indicated that the temperature was the primary factor controlling the process of denitrification(significant positive correlation,Pdenitrification rates,*** the Yangtze estuary,increasing of water salinity had no significant inhibition of denitrification because of the wide change range of water salinity.

关键词： Yangtze estuary, tidal flat sediment, denitrification, effect factors

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denitrification in Chongming east tidal flat sediment, Yangtze estuary, China

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Science China Earth Sciences 2006年第10期49卷 1090-1097页

作者： WANG Dongqi1,2, CHEN Zhenlou1,3, XU Shiyuan1,2, HU Lingzhen1 & WANG Jun1,2 1. College of Resources & Environment, East China Normal University, Shanghai 200062, China 2. State Key Laboratory of Estuarine and Coastal Sediment Dynamics and Morphodynamics, East China Normal University, Shanghai 200062, China 3. Key Laboratory of Geographical Information Science of Ministry of Education,East China Normal University,Shanghai 200062, China College of Resources & Environment East China Normal University Shanghai China State Key Laboratory of Estuarine and Coastal Sediment Dynamics and Morphodynamics East China Normal University Shanghai China Key Laboratory of Geographical Information Science of Ministry of Education East China Normal University Shanghai China

From July 2003 to July 2004, samples were collected on Chongming Island east tidal flat every two months. The research showed that the nitrous oxide (N2O) production rate was very low in the water, Chongming east tidal flat (CM) sediment was the N2O source of the water. Sediment N2O natural production rate was between -0.08 and 1.74 μmolN·m-2·h-1. N2O natural production rate was higher in the summer. The difference of the N2O natural production rate in the different tidal flats, the correlation between the N2O natural production rate and the denitrification rate, and those with the temperature and DO indicate that middle tidal flat sediment denitrification was the main process of the N2O production, while in the low tidal flat sediment, the production of the N2O came from several processes of the nitrogen cycling. Tidal flat sediment denitrification reaction was stronger in summer and winter but relatively lower in the late autumn and early spring. Seasonal change of the sediment denitrification rate was wide, from 1.12 to 33.34 μmolN·m-2·h-1. Temperature, DO and the coactions of them had the prominent effect on the tidal flat sediment denitrification.

关键词： Yangtze estuary, tidal flat sediment, denitrification, nitrous oxide, effect factor.

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Structural and functional analysis of denitrification genes in Pseudomonas stutzeri A1501

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Science China(Life Sciences) 2005年第6期48卷 585-592页

作者： YAN Yongliang1,2, YANG Jian2, CHEN Lihong2, YANG Fan2, DONG Jie2, XUE Ying2, XU Xingye2, ZHU Yafang2, YAO Zhijian3, LIN Min4, WANG Yiping5 & JIN Qi1,2 1. College of Biological Sciences, China Agricultural University, Beijing 100094, China 2. State Key Laboratory for Moleclular Virology and Genetic Engineering, Beijing 100176, China 3. National Center for Human Genome Research, Beijing 100176, China 4. Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China 5. College of Life Sciences, Peking University, Beijing 100871, China College of Biological Sciences China Agricultural University Beijing 100094 China State Key Laboratory for Moleclular Virology and Genetic Engineering Beijing 100176 China State Key Laboratory for Moleclular Virology and Genetic Engineering Beijing 100176 China National Center for Human Genome Research Beijing 100176 China Biotechnology Research Institute Chinese Academy of Agricultural Sciences Beijing 100081 China College of Life Sciences Peking University Beijing 100871 China

Four gene clusters associated with denitrification were identified in the genome of A1501 strain, nar, nir, nor and nos, including 40 genes totally, which encode proteins for sub-stance transportation, gene regulation and reductases. The three gene clusters, nir, nor and nos are adjacent on chromosome and are far from nar gene cluster. Compared with other denitrifying bacteria, the 40 denitrification genes in A1501 strain compose a complete denitrification catalysis system. In A1501 strain, this system has the following characteristics: (i) only one copy of narK gene is found in nar gene cluster; (ii) a narM gene is present between narK and narG; (iii) two genes, dnarE and orfl are identified at downstream of narX and narL genes, of which dnrE per-haps is a transcriptional factor belonging to FNR family; (iv) there are 16 nir genes in A1501, the most in the known denitrifying bacteria; (v) it is for the first time that norR gene has been found in A1501 and also in Pseudomonas; (vi) nos gene cluster is relatively conservative, with a com-pletely identical composition and arrangement of genome to the reference bacteria strain.

关键词： Pseudomonas stutzeri, denitrification, nitrate reductase, nitrite reductase, nitric oxide reductase, nitrous oxide reductase.

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