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《Geochimica》 2007-01
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Fluxes of CH_4,CO_2 and N_2O from Yangtze estuary intertidal flat in summer season

WANG Dong-qi1,2, CHEN Zhen-lou1*, WANG Jun1, XU Shi-yuan1, YANG Hong-xia1, CHEN Hua1 and YANG Long-yuan3 1. School of Resources and Environmental Science, East China Normal University, Shanghai 200062, China; 2. School of Life Science, East China Normal University, Shanghai 200062, China; 3. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China  
Carbon dioxide (CO_2), methane (CH_4) and nitrous oxide (N_2O) are three primary greenhouse gases in the atmosphere; they occupy 70%, 23%and 7%in the greenhouse forcing, respectively. Many recent studies indicate that wetlands are major sources of greenhouse gas emissions. In July and August 2004, static, closed chamber technique was used to investigate the emission and consumption of CH_4, CO_2 and N_2O in situ at Chongming east tidal flat (CM), which is the biggest and well developed typical estuarine intertidal flat wetland of Yangtze estuary. Triple black (opaque) and white (transparent) air chamber collectors were employed to collect air exchange samples at the tidal flat-atmosphere interface during ebb tide. The results indicate that CM low tidal flat was the source of atmosphere CH_4 in summer, with a emission flux of 40.2 μg/(m~2·h). At the same time, low tidal flat was the sink of atmosphere CO_2 and N_2O, the adsorption flux was -86.3 mg/(m~2·h) and -86.3 μg/(m~2·h), respectively. In July and August, middle tidal flat was the source of atmosphere CO_2, CH_4 and N_2O. The day average emission flux of CO_2, CH_4 and N_2O was 6.56 mg/(m~2·h), 301 mg/(m~2·h) and 69.9 μg/(m~2·h). Temperature (including air temperature and different depth ground temperature), the sediment organic matter content and the photosynthesis and respiration of the tidal flat plant (Scirpus mariqueter and benthonic alga) were the main effect factors on the production emission and adsorption of CO_2, CH_4 and N_2O. Correlation analysis shows that middle tidal flat-atmosphere interface CO_2, CH_4 and N_2O fluxes had a significant positive correlation to environment temperature (including air temperature and different depth ground temperature), but at low tidal flat, the correlation was not significant.
【Fund】: 上海市基础研究重点项目(05JC14059);; 国家自然科学基金(40173030 40131020 40571006);; 上海市“十五”重大科技攻关项目(05DZ12007);; 上海市环保局招标项目;; 上海市科委重大项目(05DZ12005);; 中国博士后科学基金资助项目
【CateGory Index】: X831
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