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首页> 外文期刊>Aquatic Sciences >Organic carbon and bacterial heterotrophic activity in the maximum turbidity zone of the Seine estuary (France)
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Organic carbon and bacterial heterotrophic activity in the maximum turbidity zone of the Seine estuary (France)

机译：塞纳河河口（法国）最大浊度区的有机碳和细菌异养活动

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The aim of this study is to understand the sources, biodegradability and fate of organic carbon entering the maximum turbidity zone (MTZ) of the Seine estuary. Dissolved (DOC) and particulate organic matter (POC), and their biodegradable fractions (BDOC and BPOC) were investigated immediately upstream and within the MTZ in various hydrological conditions together with bacterial production of free-living and particle-associated cells. At the entrance of the MTZ, average DOC was 3.6 mg C l~(-1) with a biodegradable fraction of 23 %. The DOC and BDOC/DOC ratio decreased linearly with increasing salinity, indicating a dilution of river freshwater with a higher DOC and higher BDOC/DOC ratio than marine waters. The organic content of suspended matter (SM) at the entrance of the MTZ was high (POC/SM ratios up to 10.6%), especially during phyto-plankton blooms when high BPOC/POC ratios were also found. Within the MTZ, the carbon content of SM was lower and less variable; the biodegradable fraction of POC in the MTZ was lower than upstream, illustrating the progressive bacterial degradation of BPOC within the MTZ. Total bacterial production in the MTZ fluctuated between 0.2 and 5.1 μg C l~(-1) h~(-1); average production of free-living bacteria was 0.77 μg C l~(-1) h~(-1) while that of attached bacteria was 1.47 μg C g SM~(-1) h~(-1) . Growth rates of attached bacteria were, on average, three times higher than those of free-living ones. Bacterial activity can explain the decrease in the POC/SM ratio observed between summer and fall in the MTZ.
机译：这项研究的目的是了解进入塞纳河河口最大浊度区（MTZ）的有机碳的来源，生物降解性和结局。在各种水文条件下，在MTZ的上游和内部立即研究了溶解的（DOC）和颗粒有机物（POC）及其可生物降解级分（BDOC和BPOC）以及细菌产生的自由活动和与粒子相关的细胞。在MTZ的入口处，平均DOC为3.6 mg C l〜（-1），可生物降解分数为23％。 DOC和BDOC / DOC的比值随盐度的增加呈线性下降，表明淡水稀释后的DOC和BDOC / DOC的比值比海水高。在MTZ入口处的悬浮物（SM）的有机含量很高（POC / SM比例高达10.6％），尤其是在浮游植物开花期间，也发现了高BPOC / POC比例。在MTZ中，SM的碳含量较低且变化较小。 MTZ中POC的可生物降解部分低于上游，这说明MTZ中BPOC的逐步细菌降解。 MTZ中的细菌总产量在0.2和5.1μgC l〜（-1）h〜（-1）之间波动；自由生活细菌的平均产量为0.77μgC l〜（-1）h〜（-1），而附着细菌的平均产量为1.47μgC g SM〜（-1）h〜（-1）。附着细菌的平均生长速度是自由细菌的三倍。细菌活性可以解释MTZ夏季和秋季之间观察到的POC / SM比降低。

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