Methane Metabolism in a Temperate Swamp
Methane Metabolism in a Temperate Swamp
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温带沼泽中的甲烷代谢
DOI：
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发表时间：
1994
影响因子：
4.4
通讯作者：
R. Knowles
中科院分区：
文献类型：
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作者：
J. A. Amaral;R. Knowles
在温带沼泽中对原位 CH4 浓度和控制其净产量的潜在因素进行了比较。在相距 1.5 至 2 m 的两个相邻地点对地下水位和 pH 值、溶解的 CH4、CO2、O2、SO42-、NO3-、甲酸盐、乙酸盐、丙酸盐和丁酸盐的深度剖面进行季节性测量。溶解的 CH4 与 O2 呈负相关，并且通常与甲烷生成的潜在抑制剂 NO3- 和 SO42- 呈负相关。在低地下水位（1992年8月），CH4最大值（2至4μM）出现在30厘米以下，而在高地下水位（1992年10月）或洪水条件下（1993年5月），CH4最大值（4至55μM）出现在顶部10至20厘米。较高的 CH4 浓度可能是由腐烂的落叶中的新鲜有机物质输入支持的，正如秋季和春季其中一个地点的高乙酸盐和丙酸盐浓度（25 至 100 μM）所表明的那样。对潜在 CH4 产量（和消耗量）的测量表明，最高速率通常发生在土壤表层 10 厘米处。土壤浆液培养证实了有机质对 CH4 生产的重要性，但也表明非产甲烷微生物对底物的竞争可能会大大减弱其影响。
Comparisons between in situ CH4 concentration and potential factors controlling its net production were made in a temperate swamp. Seasonal measurements of water table level and depth profiles of pH, dissolved CH4, CO2, O2, SO42-, NO3-, formate, acetate, propionate, and butyrate were made at two adjacent sites 1.5 to 2 m apart. Dissolved CH4 was inversely correlated to O2 and, in general, to NO3- and SO42-, potential inhibitors of methanogenesis. At low water table levels (August 1992), maximal CH4 (2 to 4 μM) occurred below 30 cm, whereas at high water table levels (October 1992) or under flooded conditions (May 1993), CH4 maxima (4 to 55 μM) occurred in the top 10 to 20 cm. Higher CH4 concentrations were likely supported by inputs of fresh organic matter from decaying leaf litter, as suggested by high acetate and propionate concentrations (25 to 100 μM) in one of the sites in fall and spring. Measurements of potential CH4 production (and consumption) showed that the highest rates generally occurred in the top 10 cm of soil. Soil slurry incubations confirmed the importance of organic matter to CH4 production but also showed that competition for substrates by nonmethanogenic microorganisms could greatly attenuate its effect.