Sediment oxygen consumption and vertical flux of organic matter in the Seto Inland Sea, Japan
Sediment oxygen consumption and vertical flux of organic matter in the Seto Inland Sea, Japan
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DOI：
10.1016/s0272-7714(02)00158-0
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发表时间：
2003-02-01
影响因子：
2.8
通讯作者：
Nakamura, Y
中科院分区：
文献类型：
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作者：
Nakamura, Y
2000年夏季，在日本濑户内海一个泥质沉积物点（21 m深度）测量了有机质垂直通量和沉积物耗氧量（SOC）。在26天的试验期内（7月15日至8月9日），发生了一次硅藻华，持续约一周。在12.5 m深度测量的有机碳和叶绿素a （F-C和F-chl）垂直通量随着水华的发展呈现出一个急剧的峰值。在此条件下，土壤有机碳变化范围为1.4 ~ 3.0 mmol O-2 m(-2) h(-1)，且受实验室内大型底栖动物生物量的强烈影响。然而，大型底栖动物的耗氧量仅占有机碳的5%。SOC的变化不伴有相应的F-C或F-chl的变化。水温、沉积物叶绿素a水平和细菌丰度等其他因素的影响较小，可能是因为这些参数在研究期间变化不大。大型底栖动物耗氧量校正后的平均SOC值(1.8 mmol O-2 m（-2) h(-1)）和转化为有机物分解速率的平均SOC值与实验期间的平均F-C值(0.7 C m（-2) day(-1)）基本平衡。这表明濑户内海的泥质沉积区在水柱提供的有机物的降解中起着重要作用。(C) 2003 Elsevier Science B.V.版权所有
Vertical flux of organic matter and rates of sediment oxygen consumption (SOC) were measured in summer 2000 at a muddy sediment site (21 m depth) in the Seto Inland Sea, Japan. During the 26-day experimental period (15 July to 9 August), a diatom bloom occurred, lasting for about a week. The vertical flux of organic carbon and chlorophyll a (F-C and F-chl), measured at 12.5 m depth, showed a sharp peak following the development of the bloom. Under these conditions, SOC ranged from 1.4 to 3.0 mmol O-2 m(-2) h(-1), and it was strongly influenced by the biomass of macrozoobenthos present in the experimental chambers used for SOC measurements. However, macrozoobenthic oxygen consumption made up only 5% of SOC. SOC variations were not coupled with corresponding changes in F-C or F-chl. The effects of other factors, such as water temperature, as well as levels of sediment chlorophyll a and bacterial abundance, were minor, presumably because these parameters did not vary strongly during the study period. The average SOC value corrected for macrozoobenthos oxygen consumption (1.8 mmol O-2 m(-2) h(-1)) and converted into the decomposition rate of organic material was nearly balanced with the F-C averaged over the experimental period (0.7 C m(-2) day(-1)). This indicates that this muddy sediment area in the Seto Inland Sea plays an important role in the degradation of organic material supplied from the water column. (C) 2003 Elsevier Science B.V. All rights reserved.