论文总字数：20779字
目 录
摘要 3
ABSTRACT 4
1.引言 5
1.1研究背景 5
1.2湿地CH4的产生、氧化和运输 5
1.3影响CH4排放的因素 6
1.4 研究意义 6
2.材料和方法 7
2.1试验设计 7
2.2温室气体CH4的采集与测定 7
2.3辅助指标测定 7
2.4统计分析 8
3.结果 8
3.1混养鱼塘和蟹塘CH4排放量 8
3.2 CH4对环境因子的响应 12
3.3混养鱼塘和蟹塘单位收入的净温室效应 16
4.讨论 16
4.1混养鱼塘和蟹塘CH4的排放规律 16
4.2不同水产养殖系统之间CH4排放的研究对比 16
4.3环境因子对CH4排放的影响 17
4.4水生植物对CH4排放的影响 18
5.结论 18
参考文献 19
致谢 22
图 表 目 录
图1 大气平均气温和降雨量 9
图2 混养鱼塘和蟹塘CH4排放通量的季节变化 10
图3 混养鱼塘和蟹塘CH4累积排放通量 11
图4 混养鱼塘和蟹塘CH4通量与水体溶解氧（DO）之间的关系 13
图5 混养鱼塘和蟹塘CH4通量与沉积物温度（T）之间的关系 14
图6 混养鱼塘和蟹塘CH4通量与沉积物有机碳（DOC）之间的关系 15
图7 混养鱼塘和蟹塘单位收入净温室效应 16
表1 不同类型水产养殖系统CH4排放速率比较 17
两种典型水产养殖系统中CH4排放规律研究
冯蓉
, China
ABSTRACT: Aquaculture ponds are important contributors to greenhouse gas flux methane (CH4) ,Taihu lake region is one of the area with extensive aquaculture in China, while few direct flux measurements are available. This study investigated the magnitude of CH4 flux and the influencing factors from mixed fish and crab aquaculture ponds during March, 2016 and March, 2017 in the Taihu Lake. CH4 flux was primarily pronounced during the waterlogging stages. The variations in CH4 flux was significant related to sediment temperature (T), sediment dissolved organic carbon (DOC), and water dissolved oxygen concentration (DO). The annual CH4 emission was 64.4 kg·C·hm-2 and 51.6 kg·C·hm-2 and 3.32 kg·N·hm-2 from the mixed fish aquaculture pond and the crab aquaculture pond, respectively. Significant differences in CH4 flux between the mixed fish and crab aquaculture ponds were observed during the year (Plt;0.05). The CH4 fluxes from the crab aquaculture pond were significantly affected by the aquatic vegetation. Compared to the treatment without aquatic, the annual CH4 emission increased by 14.0% for the treatment with aquatic. Relative to the mixed fish aquaculture pond, the net economic benefit scaled global warming potential (NEB-scaled GWP-CH4) significantly increased 80% from the crab aquaculture pond. Our results suggest that mixed fish and crab aquaculture ponds are important contributors to regional CH4 emission into the atmosphere. Furthermore, we also suggest that the aquaculture pond type should be considered when evaluating regional GHG budgets.
Key words: Methane; Mixed fish aquaculture pond; Crab aquaculture pond; NEB-scaled GWP-CH4
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