ANAEROBIC METHANE OXIDATION RATES AT THE SULFATE METHANE TRANSITION IN MARINE-SEDIMENTS FROM KATTEGAT AND SKAGERRAK (DENMARK)
ANAEROBIC METHANE OXIDATION RATES AT THE SULFATE METHANE TRANSITION IN MARINE-SEDIMENTS FROM KATTEGAT AND SKAGERRAK (DENMARK)
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DOI：
10.4319/lo.1985.30.5.0944
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发表时间：
1985-01-01
影响因子：
4.5
通讯作者：
JORGENSEN, BB
中科院分区：
文献类型：
--
作者：
IVERSEN, N;JORGENSEN, BB
同时进行了2~3m长沉积物岩心中硫酸盐还原速率和甲烷厌氧氧化速率的放射性示踪测量。甲烷仅在硫酸盐带以下、沉积物中1米或更深处积聚到高浓度(>；1 mm CH4)。硫酸盐还原在沉积物表层以下有一个较宽的最大值，而在硫酸盐-甲烷转变处有一个较小的、较窄的最大值。整个硫酸盐带甲烷氧化量很低(0.002-0.1nmolCH4 cm-3d-1)，在硫酸盐-甲烷过渡阶段出现一个尖锐的峰值，与硫酸盐还原峰值一致。两站甲烷厌氧氧化总量分别为0.83和1.16 mmolCH4m-2d-1，其中96%为硫酸盐甲烷转化。所有被计算为向上扩散进入硫酸盐-甲烷转变的甲烷在这个区域都被氧化了。甲烷氧化相当于测得的硫酸盐还原总量所需电子给体的10%。第三站各深度硫酸盐浓度较高，膜氧化总量仅为0.013 mmolm-2d-1。通过直接测量速率、浓度梯度和扩散系数，可以简单地计算硫酸盐和甲烷通量以及甲烷产生率。
Concomitant radiotracer measurements were made of in situ rates of sulfate reduction and anaerobic methane oxidation in 2-3-m-long sediment cores. Methane accumulated to high concentrations (> 1 mM CH4) only below the sulfate zone, at 1 m or deeper in the sediment. Sulfate reduction showed a broad maximum below the sediment surface and a smaller, narrow maximum at the sulfate-methane transition. Methane oxidation was low (0.002-0.1 nmol CH4 cm-3 d-1) throughout the sulfate zone and showed a sharp maximum at the sulfate-methane transition, coinciding with the sulfate reduction maximum. Total anaerobic methane oxidation at 2 stations was 0.83 and 1.16 mmol CH4 m-2 d-1, of which 96% was confined to sulfate-methane transition. All the methane that was calculated to diffuse up into the sulfate-methane transition was oxidized in this zone. The methane oxidation was equivalent to 10% of the electron donor requirement for the total measured sulfate reduction. A third station showed high sulfate concentrations at all depths sampled and the total membrane oxidation was only 0.013 mmol m-2 d-1. From direct measurements of rates, concentration gradients, and diffusion coefficients, simple calculations were made of sulfate and methane fluxes and of methane production rates.