目录
摘 要 II
关键词 ： III
ABSTRACT IV
KEY WORDS ： IV
引言 1
1材料与方法 2
1.1研究区域概况 2
1.2试验设计 2
1.3方法 3
1.3.1气体采集与分析 3
1.3.2水样的采集与分析 4
1.3.3漂浮箱法甲烷排放通量的计算 4
2结果与分析 5
2.1养殖中期甲烷排放变化 5
2.2箱法和扩散模型法甲烷排放比较 6
2.3影响甲烷排放的影响因子 7
2.3.1水体pH 7
2.3.2水体电导率 8
2.3.3水体溶解率 8
3结论 10
4讨论 10
4.1试验思考与比较 10
4.2不足与展望 11
致谢 12
蟹塘养殖湿地甲烷排放观测研究
摘 要
大气中温室气体浓度增加所导致的全球变暖是当今全球性的环境问题。甲烷(CH4)是大气中重要长效温室气体，而水产养殖湿地是大气甲烷的重要排放源。中国作为世界水产养殖国家，其对全球变暖的贡献不容忽视。本研究以我国江苏兴化具有代表性蟹塘养殖湿地为研究对象，通过采用漂浮通量箱法和扩散模型法对比同步观测蟹塘湿地养殖关键期CH4排放通量，揭示了蟹塘养殖关键期CH4排放特征以及影响因子。研究结果表明：(1)蟹塘养殖湿地在养殖关键期CH4排放通量较高，夏季达到3.07 mg(m2h)1；(2) 漂浮箱法观测出的CH4 排放通量显著高于扩散模型法估算数据，通过漂浮箱法得到CH4 排放通量的变化值为 0.16~3.07 mg(m2h)1 ，通过模型法估算CH4排放通量变化值为 0.07~1.46 mg(m2h)1，但漂浮箱法准确性更高，更适用于养殖湿地的观测研究；(3)养殖湿地CH4排放主要受水温和溶解氧(DO)影响，与水温呈正相关，溶解氧呈负相关，而与水体pH和电导率没明显的相关性。研究证明，通过对养殖湿地的水温与溶解氧的调控，可以有效降低蟹塘养殖湿地养殖期CH4排放强度。
关键词  *51今日免费论文网|www.51jrft.com +Q: ￥351916072$ 
：甲烷；漂浮箱法；扩散模型法；蟹塘养殖湿地
METHANE EMISSIONS FROM CRAB AQUACULTURE WETLANDS
ABSTRACT
Global warming caused by an increase in the concentration of greenhouse gases in the atmosphere is a global environmental problem today. Methane (CH4) is an important longterm greenhouse gas in the atmosphere, and aquaculture wetlands are an important source of atmospheric methane emissions. As a world aquaculture country, Chinas contribution to global warming cannot be ignored. This study took the representative crab pond culture wetland in Xinghua, Jiangsu, China as the research object. By comparing the simultaneous observation of CH4 emission fluxes in the critical period of crab pond wetland culture using floating flux box method and diffusion model method, the critical period of crab pond culture CH4 emission characteristics and impact factors. The research results show that: (1) The CH4 emission flux of crab pond culture wetland is high in the critical period of culture, reaching 3.07 mg (m2 h) 1 in summer; (2) The difference between the floating box method and the diffusion model method is significant. The change value of CH4 emission flux obtained by the floating box method is 0.16 ~ 3.07 mg (m2 h) 1, and the change value of CH4 emission flux estimated by the model method is 0.07 ~ 1.46 mg (m2 h) 1, but The floating box method has higher accuracy and is more suitable for observation and research on farming wetlands; (3) CH4 emissions from farming wetlands are mainly affected by water temperature and DO, which is positively correlated with water temperature and negatively correlated with dissolved oxygen, but with water pH There is no obvious correlation with conductivity. The research proves that by adjusting the water temperature and dissolved oxygen in the cultured wetland, the CH4 emission intensity during the crab pond culture wetland culture period can be effectively reduced.

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