Seasonal organic matter dynamics in a temperate shelf sea
Seasonal organic matter dynamics in a temperate shelf sea
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DOI：
10.1016/j.pocean.2018.02.021
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发表时间：
2019-10-01
影响因子：
4.1
通讯作者：
Mahaffey, Claire
中科院分区：
文献类型：
--
作者：
Davis, Clare B.;Blackbird, Sabena;Mahaffey, Claire
有机质在陆架海生产中起着重要的作用，对全球碳和营养盐循环的贡献也很大。我们调查了溶解和颗粒OM（DOM和POM，分别）在凯尔特海的季节性周期的动态。OC含量在春季开花期最高，秋季最低。相对于POM池和Redfield比率（106 C：16 N：P），DOM始终富含C。C、N、P与有机质组成对不同季节和微生物群落营养状况的响应存在明显的脱钩性。C：P化学计量比比C：N化学计量比变化更大，C：N化学计量比接近恒定。向下的有机碳通量占主导地位的POM在水华事件和DOM在分层的夏季。在分配方面，92-96%的有机碳在整个采样过程中都在DOM池中，这表明它具有较高的C：N（12.4-17），这表明它是冬季混合过程中潜在的现成C输出的有效工具。
Organic matter (OM) plays an important role in productive shelf seas and their contribution to global carbon (C) and nutrient cycles. We investigated dissolved and particulate OM (DOM and POM, respectively) dynamics over a seasonal cycle in the Celtic Sea. The quantity of OC was largest during the spring bloom and lowest in autumn. DOM was always C rich relative to the POM pool and the Redfield ratio (106C:16N:P). There was clear decoupling between C, N and P and the response of OM composition to different seasons and nutrient statuses of the microbial community. The C:P stoichiometry was much more variable than the C:N stoichiometry, which was near constant. Downward OC fluxes were dominated by POM during bloom events and DOM during the stratified summer. In terms of partitioning, 92-96% of OC was in the DOM pool throughout sampling, which given its high C:N (12.4-17) suggests it was an efficient vehicle for potential off-shelf export of C during winter mixing.