SORPTIVE PRESERVATION OF LABILE ORGANIC-MATTER IN MARINE-SEDIMENTS
SORPTIVE PRESERVATION OF LABILE ORGANIC-MATTER IN MARINE-SEDIMENTS
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DOI：
10.1038/370549a0
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发表时间：
1994-08-18
期刊：
影响因子：
64.8
通讯作者：
HEDGES, JI
中科院分区：
文献类型：
--
作者：
KEIL, RG;MONTLUCON, DB;HEDGES, JI
保存在海洋沉积物中的有机物质提供了海洋生物过程的分子记录(1)，约占所有碳埋藏的20%(2)，并在平衡向大气的长期氧气流动方面发挥着关键作用(3)。直到最近，人们才意识到，保存在大多数海洋沉积物中的90%以上的有机物与矿物表面密切相关。然而，对矿物表面的吸附在控制海洋沉积记录中有机质的稳定性或数量方面可能产生的影响知之甚少。保存下来的有机物质可以是本质稳定的，也可以通过与矿物基质的相互作用而稳定。我们在这里表明，有机物在海洋沉积物中矿物表面的吸附稳定了组成分子，使再矿化速度减慢了高达五个数量级。因此，吸附保护可以解释海洋沉积物中氨基酸和单糖等内在不稳定分子的神秘保存(5，6)，并将海洋沉积物中有机碳的保存与矿物表面的沉积联系起来。
ORGANIC matter preserved in marine sediments provides a molecular record of marine biological processes(1), accounts for approximately 20% of all carbon burial(2) and plays a key role in balancing the long-term flux of oxygen to the atmosphere(3). Only recently has it been appreciated that more than 90% of the organic matter preserved in most marine sediments is intimately associated with mineral surfaces(4). Little is known, however, of the effect that sorption to mineral surfaces might have in controlling either the lability or-quantity of-organic matter in the marine sedimentary record. The preserved organic material could be either intrinsically stable, or stabilized through interactions with mineral matrices. We show here that sorption of organic matter to mineral surfaces in marine sediments stabilizes the component molecules, slowing remineralization rates by up to five orders of magnitude. Sorptive protection can therefore account for the enigmatic preservation of intrinsically labile molecules such as amino acids and simple sugars in marine deposits(5,6) and links the preservation of organic carbon in marine sediments to the deposition of mineral surfaces.