Preliminary Studies on Gross Nitrification, Denitrification and Respiratory Rates in Sediments from a Typical Coastal Wetland, Chongming East Intertidal, Using a Method of BaPS
Drying and re-flooding in coastal wetlands physically response to the periodic semi-lunar and diurnal tides, together with the rising and leaching of salts. This substantially complicates nitrogen transformation in sediments. Sediment and water samples are taken from Chongming east intertidal flat,...
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Published in | 2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering pp. 1 - 3 |
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Main Authors | , , |
Format | Conference Proceeding |
Language | English |
Published |
IEEE
01.06.2012
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Subjects | |
Online Access | Get full text |
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Summary: | Drying and re-flooding in coastal wetlands physically response to the periodic semi-lunar and diurnal tides, together with the rising and leaching of salts. This substantially complicates nitrogen transformation in sediments. Sediment and water samples are taken from Chongming east intertidal flat, a typical coastal wetland in China, to investigate gross nitrification, denitrification and respiratory rates under three simulated processes of drying and rewetting, using a method of barometric process separation (BaPS). When moisture of sediment decreases to 30% during drying period, nitrification, denitrification and respiratory rates reach the maximum of 2249, 4149 μg N·kg -1 SDW·h -1 and 3948 μg C·kg -1 SDW·h -1 , respectively. After then, the rates decrease linearly with the decreasing moisture. During the cycles of semi-lunar tide, the highest nitrification and denitrification rates occur at moisture of 30-35% with a mean of 2809±925 and 4280±115 μg N·kg -1 SDW·h -1 , respectively. In contrast, the respiratory rates reach the highest at 20-40%, varying between 3165-6677 μg C·kg -1 SDW·h -1 . In addition, it is found that BaPS system does not smoothly work when moisture of sediment is above 40%. |
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ISBN: | 1467308722 9781467308724 |
DOI: | 10.1109/RSETE.2012.6260663 |