长江入海口沉积物甲烷厌氧氧化作用研究

论文总字数：19135字

目 录

引言 4

1 材料与方法 4

1.1　实验区概况 4

1.2　样品的采集 4

1.3　样品的分析测试 5

1.4间隙水溶解性CH₄浓度和δ¹³C的测定 5

1.5 数据处理与统计分析 5

2 结果与分析 5

2.1 沉积物的理化特征 5

2.2水溶性CH₄浓度空间变化 8

2.3同水平下水溶性CH₄浓度变化 8

2.4沉积物甲烷碳同位素变化 9

2.5沉积物水溶性CH₄浓度与环境因子的相关关系 10

3 讨论 11

3.1 土壤水溶性CH₄浓度空间分布特征 11

3.2 环境因子对土壤水溶性CH₄浓度的影响 12

3.3 土壤水溶性CH₄碳同位素变化 12

结论 13

参考文献: 13

致谢 15

长江入海口沉积物甲烷厌氧氧化作用研究

艾尔卡尼·艾力

，China

Abstract : The input of organic matter in the upper reaches of the Yangtze River is increasingly influenced by the input to the sea, and the CH₄ concentration may change drastically. Taking the coastal wetlands of the Yangtze River estuary as the research object, samples were taken at intervals of 0-30 cm and every 5 cm to determine the water-soluble CH₄ concentration and the main physicochemical characteristics of the soil. The results show that: The average concentrations of water-soluble CH₄ in Yanshan Port, Luchao Port, Changxing Island and Nanhui wetland are 5.58, 14.72, 28.40 and 63.72 μmol•L^-1, respectively; The salt concentration gradients along the ocean to land, The concentration of water-soluble CH₄ increased gradually. The concentration of water-soluble CH₄ in Nanhui wetland was 91.2%, 76.9%, and 55.4% higher than the water-soluble CH₄ concentration in Yangshan Port, Luchao Port, and Changxing Island, respectively; Water-soluble CH₄ Concentration and Environment There was a significant positive correlation between DOC, SOC, NH₄ -N, and NO₃^--N levels in the factors, and there was a significant negative correlation between SO₄^2-content and electrical conductivity. The correlation coefficients were 0.82, 0.83, 0.86, 0.85, -0.83,and-0.85, in addition, the input of organics from the upper reaches also affected the spatial variation of water-soluble CH₄ concentration; Soil SOC, SO₄^2-, and NH₄ -N contributed more to the water-soluble CH₄ concentration in the seashore coastal wetland, and the three could explain the concentration change 85.6%; It is closer to the anaerobic methane layer, the heavier the carbon isotope of methane, the methane carbon isotope can be measured. It can be speculated that the anaerobic oxide layer of methane in Yangshan Port, Luchao Port, and Changxing Island may exist 30cm deep under the soil. And with Next, the anaerobic oxide layer of methane in Nanhui wetland may not be affected by human activities.

Keywords: anaerobic oxidation of methane; water-soluble CH₄ concentration; estuary of Yangtze River; carbon isotope of methane.

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