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夏季长江口潮间带CH4、CO2和N2O通量特征

ISSN号：0379-1726
期刊名称：《地球化学》
时间：0
分类：P595[天文地球—地球化学;天文地球—地质学]
作者机构：[1]华东师范大学资源与环境科学学院,上海200062, [2]华东师范大学生命科学学院,上海200062, [3]中国科学院南京地理与湖泊研究所,江苏南京210008
相关基金：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

作者：王东启[1,2], 陈振楼[1], 王军[1], 许世远[1], 杨红霞[1], 陈华[1], 杨龙元[3]

关键词：潮间带, 温室气体, 通量, 长江口, intertidal flat, ouse gas, flux, Yangtze Estuary

中文摘要：

使用原位静态箱现场采样，对夏季（7月和8月）长江口崇明东滩湿地3种主要温室气体CO2、CH4和N2O的界面通量进行了同步观测。结果表明，夏季低潮滩是大气CH4,的排放源（40．2μg／（m^2·h）），CO2和N2O的吸收汇（通量值分别为-86．3mg／（m^2·h），-27．6μg（m^2·h））。7月和8月中潮滩是3种温室气体的排放源，CH4日平均排放速率达到6．56mg／（m^2·h），C02为301mg／（m^2·h），N20为69．9μg／（m^2·h）。温度（气温和不同深度地温）、沉积物有机碳含量以及潮滩植被海三棱藤草和沉积物表层藻类的光合和呼吸是决定CH4、CO2、N2O产生、排放和吸收的主要因素。相关分析表明中潮滩气体排放通量与温度（气温和不同深度地温）呈显著正相关关系，但在低潮滩气体通量与温度的相关关系不明显。

英文摘要：

Carbon dioxide （CO2）, methane （CH4） and nitrous oxide （N2O） 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 CH4, CO2 and N2O in situ at Chongming east tidal fiat （CM）, which is the biggest and well developed typical estuarine intertidal fiat wetland of Yangtze estuary. Triple black （opaque） and white （transparent） air chamber collectors were employed to collect air exchange samples at the tidal fiat-atmosphere interface during ebb tide. The results indicate that CM low tidal fiat was the source of atmosphere CH4 in summer, with a emission flux of 40.2 μg/（m^2· h）. At the same time, low tidal fiat was the sink of atmosphere CO2 and N2O, the adsorption flux was -86. 3 mg/（m^2· h） and -86. 3 μg/（m^2 · h）, respectively. In July and August, middle tidal fiat was the source of atmosphere CO2, CH4 and N2O. The day average emission flux of CO2, CH4 and N2O 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 fiat plant （ Scirpus mariqueter and benthonic alga） were the main effect factors on the production emission and adsorption of CO2, CH4 and N2O.Correlation analysis shows that middle tidal flat-atmosphere interface CO2, CHa and N2O 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.

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