Biogeochemical Processes of Methane Cycle in the Soils, Bogs, and Lakes of Western Siberia
Biogeochemical Processes of Methane Cycle in the Soils, Bogs, and Lakes of Western Siberia
复制标题
西西伯利亚土壤、沼泽和湖泊中甲烷循环的生物地球化学过程
DOI：
10.1023/a:1010477413264
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发表时间：
2001
期刊：
影响因子：
1.5
通讯作者：
S. V. Barysheva
中科院分区：
文献类型：
--
作者：
V. F. Gal’chenko;L. Dulov;B. Cramer;N. I. Konova;S. V. Barysheva
研究了西伯利亚西部塔尔科-销售气田附近冻土和针叶林土壤上层以及隆起沼泽和湖底沉积物中甲烷生成和氧化的地球化学过程。无论是在干燥和积水的土壤中，总甲烷浓度（在土壤颗粒和气相）是一个数量级高于单独在土壤气相（22和1.1 nl/cm 3，分别）。沼泽和湖底沉积物中甲烷浓度高达11 μl/cm 3。乙酸盐是新形成的甲烷的主要前体。乙酸型产甲烷速率可达55 ng C/（cm ~ 3·d），而自养型产甲烷速率要低一个数量级。在沼泽和湖泊沉积物中观察到最活跃的甲烷产生和氧化，其中CO2的δ 13 C值与细菌甲烷氧化的强度呈负相关。沼泽和湖底沉积物中甲烷的δ 13 C值为-78 ‰ ~-47‰，二氧化碳的δ 13 C值为-18 ‰ ~-1‰。在这些生态系统中，甲烷排放量从3到206毫克CH 4/（m2天）。相反，干旱和积水的冻土带和针叶林土壤采取了大气中的甲烷在0.3至5.3毫克CH 4/（米2天）的速度。土壤中甲烷的消耗具有生物学性质。放射性同位素方法和室内实验证实了这一点，其中观察到甲烷碳的加权（δ 13 C值从-51 ‰变化到-41‰）。
The biogeochemical processes of methane production and oxidation were studied in the upper horizons of tundra and taiga soils and raised bogs and lake bottom sediments near the Tarko-Sale gas field in western Siberia. Both in dry and water-logged soils, the total methane concentration (in soil particles and gaseous phase) was an order of magnitude higher than in the soil gaseous phase alone (22 and 1.1 nl/cm3, respectively). In bogs and lake bottom sediments methane concentration was as high as 11 μl/cm3. Acetate was the major precursor of the newly formed methane. The rate of aceticlastic methanogenesis reached 55 ng C/(cm3day), whereas that of autotrophic methanogenesis was an order of magnitude lower. The most active methane production and oxidation were observed in bogs and lake sediments, where the δ13C values of CO2were inversely related to the intensity of bacterial methane oxidation. Methane diffusing from bogs and lake bottom sediments showed δ13C values ranging from –78 to –47‰, whereas the δ13C value of carbon dioxide ranged from –18 to –1‰. In these ecosystems, methane emission comprised from 3 to 206 mg CH4/(m2day). Conversely, the dry and water-logged soils of the tundra and taiga took up atmospheric methane at a rate varying from 0.3 to 5.3 mg CH4/(m2day). Methane consumption in soils was of biological nature. This was confirmed by the radioisotopic method and chamber experiments, in which weighting of methane carbon was observed (the δ13C value changed from –51 to –41‰).