The importance of benthic macrofauna in decomposition of microalgae in a coastal marine sediment
The importance of benthic macrofauna in decomposition of microalgae in a coastal marine sediment
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大型底栖动物在沿海海洋沉积物中微藻分解中的重要性
DOI：
10.4319/lo.1992.37.7.1392
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发表时间：
1992
影响因子：
4.5
通讯作者：
E. Kristensen
中科院分区：
文献类型：
--
作者：
F. Andersen;E. Kristensen
通过在有动物和无动物的原状沉积物岩心中加入14 C标记的微藻，在微观世界中研究了大型动物在分解有机物方面的有效性。底栖大型动物的存在仅在初始阶段（4天）短暂地刺激14 C 02的释放; 21天后，释放的14 C 0总量与有或无动物几乎相等。以~（14）C_0产生速率为基础的一级衰减速率常数，有动物的为0.019 d ~（-1），无动物的为0.020。沉积物释放的[14 C]DOC占14 C释放总量的4-5%。在实验过程中的任何时间，只有一小部分作为藻类添加的14 C在孔隙水中被发现为14 C 0（最大，1.2%）或[14 C]DOC（最大，0.7%）。相比之下，在动物存在下，沉积物TCO（总无机C）产生（700 h）和O吸收（17%）率均显著增加。标记与未标记的化合物通量的大型底栖动物的效果之间的差异表明，表面存款馈线主要影响老和相对难降解的沉积物有机物的分解。河口和沿海地区产生的大部分有机物通过沉积物中的好氧和厌氧微生物过程分解（Smith 1974）。分解的速度通常是
The effectiveness of macrofauna in decomposing organic matter was studied in microcosms by adding 14C-labeled microalgae to undisturbed sediment cores with and without fauna. The presence of benthic macrofauna stimulated release of 14C02 only briefly during the initial phase (4 d); after 21 d the total amount of 14C0, released was nearly equivalent with or without fauna. The firstorder decay rate constant of the added organic matter based on the rate of 14C0, production was 0.019 d-’ with fauna and 0.020 without. The release of [14C]DOC from the sediment accounted for 4-5% of the total 14C release. Only a small fraction of the 14C added as algae was found as 14C0, (max, 1.2%) or [14C]DOC (max, 0.7%) in the pore water at any time during the experiment. In contrast, there was a significant increase of both sediment TCO, (total inorganic C) production (7OOh) and 0, uptake (17%) rates in the presence of animals. The discrepancy between the effect of macrofauna on fluxes of labeled vs. unlabeled compounds indicates that the surface deposit feeders primarily affected decomposition of old and relatively refractory sediment organic matter. Much of the organic matter produced in estuarine and coastal marine areas is decomposed by aerobic and anaerobic microbial processes in the sediment (Smith 1974). The rate of decomposition is generally re