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Study on nitrification and impact factors in Pearl River estuarine wetlands
WANG Yu-ping, WANG Li-li, Li Qu-sheng, YE mei
1. Department of Environment Engineering, Jinan University, Guangzhou 510632, China; 2. Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation, Department of Education of Guangdong Province, Guangzhou 510632, China
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Abstract  

The distributions of ammonia-oxidizing bacteria(AOB),performance of nitrification and its impact factors in mangrove,phragmites and tidal flats areas of Pearl River estuarine wetlands were investigated based on field investigation and laboratory simulation experiments.The results indicated that the numbers of AOB had significant difference at three kinds of ecological environments.The laboratory simulation experiments showed that temperature,pH,salinity and the concentration of ammonia influenced the process of nitrification;especially pH and salinity had significant effect on nitrifying capacity.Higher salinity and lower temperature could inhibit the process of nitrification.Alkaline condition(pH=8.5)was suitable for nitrification in all experiment areas with the nitrifying capacity of about 2.5 times higher than acidic condition(pH=6.5).The optimum temperature for nitrification was about 28℃ and the content of ammonia nitrogen could improve the growth of AOB.The macrophyte was important in nitrogen cycle in the Pearl River estuarine wetlands.

Key wordsestuarine wetlands      nitrification      nitrosomonas      impact factors     
Received: 25 June 2012     
:  P931  
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WANG Yu-ping,WANG Li-li,Li Qu-sheng. Study on nitrification and impact factors in Pearl River estuarine wetlands[J]. , 2012, 31(3): 330-334.
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http://www.ecolsci.com/EN/     OR     http://www.ecolsci.com/EN/Y2012/V31/I3/330
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