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有机碳在海洋环境中的长期保存机制一直是海洋碳循环研究的重点,也是研究气候变化与全球碳循环之间作用和反馈的关键。据估算,表层海洋沉积物中约20%的有机碳是通过与氧化铁的结合而保存下来的,因此与氧化铁结合是有机碳长期保存的关键因素之一。研究表明,有机碳—氧化铁复合物的形成主要通过吸附和共沉淀这2种机制,共沉淀反应是有机碳与氧化铁在海洋环境中结合的主导机制。不同来源的有机物在发生与铁氧化物的共沉淀或吸附作用时是有选择性的,在大部分海洋环境中铁氧化物优先与海洋有机碳结合,但在河口三角洲区域,铁氧化物优先与陆源有机碳结合。大量的陆源输入,较高的初级生产和频繁的再悬浮活动使河口边缘海特别适于开展有机碳—氧化铁结合的相关研究,这也是今后研究的重点方向。
The long-term conservation mechanism of organic carbon in the marine environment has been the focus of the study on marine carbon cycle and the key to studying the role and feedback between climate change and the global carbon cycle. It is estimated that about 20% of the organic carbon in surface marine sediments is preserved through the combination with iron oxide. Therefore, the combination with iron oxide is one of the key factors for the long-term conservation of organic carbon. The results show that the formation of organic carbon-iron oxide complex mainly through the two mechanisms of adsorption and coprecipitation, co-precipitation reaction is the dominant mechanism of organic carbon and iron oxide in the marine environment. Organisms from different sources are selective in the coprecipitation or adsorption with iron oxides. In most marine environments, iron oxides are preferentially combined with marine organic carbon, but in the estuarine delta region, iron oxides are preferred to terrestrial sources Organic carbon bonding. The large amount of terrestrial input, higher primary production and frequent resuspension activities make the estuary edge sea particularly suitable for organic carbon-iron oxide binding research, which is also the focus of future research.