OXIDATION OF METHANE IN THE OXIC SURFACE-LAYER OF A DEEP LAKE SEDIMENT (LAKE CONSTANCE)
OXIDATION OF METHANE IN THE OXIC SURFACE-LAYER OF A DEEP LAKE SEDIMENT (LAKE CONSTANCE)
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DOI：
10.1111/j.1574-6968.1990.tb03935.x
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发表时间：
1990-02-01
影响因子：
4.2
通讯作者：
CONRAD, R
中科院分区：
文献类型：
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作者：
FRENZEL, P;THEBRATH, B;CONRAD, R
氧和甲烷代谢进行了测量，使用完整的沉积物芯取自博登湖的深水（147米深）。垂直O2分布测定与O2微电极。氧气渗透到沉积物中的深度约为1.5 - 2.5毫米。潜在的O2消耗率没有显着不同的采样日期和采样地点之间的深湖底。溶解的CH4在2和10 cm深度之间线性增加，导致约369 μ mol CH4 m-2 d-1的扩散通量进入到氧化沉积物表层，如根据Fick定律计算的。在泥浆沉积物亚柱样中测定了甲烷生成活性。在2 - 10 cm深度上整合这些活动表明总产量为1400 μ mol CH4 m-2d-1。用含O2的低温水覆盖的完整沉积物芯的温育导致约35 μ mol CH 4 m-2d-1的通量从沉积物进入水中。然而，一旦溶解的O2降低到小于约18 μ M O2，CH4通量就突然增加到约480 μ mol CH4 m-2d-1。这厌氧CH4通量是类似的CH4生产估计从垂直分布的溶解CH4，但远高于在有氧条件下测量的CH4通量。因此，约93%的甲烷产生必须已被氧化的好氧沉积物表层内的好氧甲烷氧化细菌消耗约> 9%的O2通量进入沉积物。
Oxygen and methane metabolism were measured using intact sediment cores taken from the profundal (147 m depth) of Lake Constance. Vertical O2 profiles were determined with O2 microelectrodes. Oxygen penetrated into the sediment to a depth of about 1.5-2.5 mm. The potential O2 consumption rates did not differ significantly between various sampling dates and sampling sites on the deep lake floor. Dissolved CH4 increased linearly between 2 and 10 cm depth resulting in a diffusive flux of about 369 .mu.mol CH4 m-2 d-1 into the oxic sediment surface layer as calculated from Fick''s law. Activities of methanogenesis were measured in slurried sediment subcores. Integration of these activities over 2-10 cm depth indicated a total production of 1400 .mu.mol CH4 m-2 d-1. Incubation of intact sediment cores overlaid with O2-containing hypolimnetic water resulted in a flux of about 35 .mu.mol CH4 m-2 d-1 out of the sediment into the water. However, as soon as dissolved O2 had decreased to less than about 18 .mu.M O2, the CH4 flux abruptly increased to about 480 .mu.mol CH4 m-2 d-1. This anaerobic CH4 flux was similar to the CH4 production estimated from the vertical distribution of dissolved CH4, but was much higher than the CH4 flux measured under aerobic conditions. Therefore, about 93% of the produced CH4 must have been oxidized within the oxic sediment surface layer by aerobic methanotrophic bacteria which consumed about > 9% of the O2 flux into the sediment.