摘要
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 (FC and Fchl), 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 O2 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 FC or Fchl. 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 O2 m−2 h−1) and converted into the decomposition rate of organic material was nearly balanced with the FC 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.
摘要译文
2000年夏季，在日本濑户内海的一个泥泞的沉积地点（21米深处）测量了有机质的垂直通量和沉积物耗氧率（SOC）。在为期26天的实验期间（7月15日至8月9日），发生了硅藻花，持续约一周。有机碳垂直通量和叶绿素a（FC和Fchl），在12时测得。深度5米，随着开花的发展呈现出尖峰。在这些条件下，土壤有机碳含量范围为1.4〜3.0 mmol O2·m-2·h-1，并且受到用于SOC测量的实验室中存在的大型底栖生物的生物量的强烈影响。但是，大型底栖动物的耗氧量仅占SOC的5％。SOC变化不与FC或Fchl的相应变化相结合。其他因素的影响，如水温，以及沉积物叶绿素a和细菌丰度水平较小，可能是因为这些参数在研究期间没有强烈的变化。对于大型底栖生物的耗氧量，校正SOC的平均值（1。8 mmol O2·m-2·h-1），并转化为有机物质的分解速率与实验期间的平均FC（0.7Cm-2天 - 1 / SUP）。这表明濑户内海泥沙沉积区在水体有机物降解中起着重要作用。
YNakamura;. Sediment oxygen consumption and vertical flux of organic matter in the Seto Inland Sea, Japan[J]. Estuarine, Coastal and Shelf Science, 2003,56(2): 213-220