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首页> 外文期刊>Estuarine Coastal and Shelf Science >Sources and preservation of organic matter in Plum Island salt marsh sediments (MA, USA): long-chain n-alkanes and stable carbon isotope compositions
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Sources and preservation of organic matter in Plum Island salt marsh sediments (MA, USA): long-chain n-alkanes and stable carbon isotope compositions

机译：梅子岛盐沼沉积物中的有机物来源和保存（美国马萨诸塞州）：长链正构烷烃和稳定的碳同位素组成

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摘要

Elemental (TOC, TN, C/N) and stable carbon isotopic (δ~(13)C) compositions and n-alkane (nC_(16-38)) concentiations were measured for Spartina alterniflora, a C_4 marsh grass, Typha latifolia, a C_3 marsh grass, and three sediment cores collected from middle and upper estuarine sites from the Plum Island salt marshes. Our results indicated that the organic matter preserved in the sediments was highly affected by the marsh plants that dominated the sampling sites. δ~(13)C values of organic matter preserved in the upper fresh water site sediment were more negative (-23.0 +- 0.3) as affected by the C_3 plants than the values of organic matter preserved in the sediments of middle (-18.9 +- 0.8) and mud flat sites (-19.4 +- 0.1) as influenced mainly by the C_4 marsh plants. The distribution of n-alkanes measured in all sediments showed similar patterns as those determined in the marsh grasses S. alterniflora and T. latifolia, and nC_(21) to nC_(33) long-chain n-alkanes were the major compounds determined in all sediment samples. The strong odd-to-even carbon numbered n-alkane predominance was found in all three sediments and nC_(29) was the most abundant homologue in all samples measured. Both δ~(13)C compositions of organic matter and n-alkane distributions in these sediments indicate that the marsh plants could contribute significant amount of organic matter preserved in Plum Island salt marsh sediments. This suggests that salt marshes play an important role in the cycling of nutrients and organic carbon in the estuary and adjacent coastal waters.
机译：测量了互花米草，C_4沼泽草，香蒲的元素（TOC，TN，C / N）和稳定的碳同位素（δ〜（13）C）组成和正构烷烃（nC_（16-38））的浓度，一个C_3的沼泽草，并从梅子岛盐沼的中上河口站点收集了三个沉积物核心。我们的结果表明，沉积物中保存的有机物受到采样点主导的沼泽植物的高度影响。受C_3植物影响，上部淡水位点沉积物中有机物的δ〜（13）C值比中部沉积物中有机物的值（-18.9 +）更负（-23.0 +-0.3） -0.8）和泥滩（-19.4 +-0.1），主要受C_4沼泽植物的影响。在所有沉积物中测得的正构烷烃分布与沼泽草互花米草和桔梗草中测定的模式相似，其中nC_（21）至nC_（33）长链正构烷烃是主要化合物。所有沉积物样品。在所有三个沉积物中均发现了强的奇数至偶数碳编号正构烷烃优势，nC_（29）是所有测量样品中最丰富的同源物。这些沉积物中有机物的δ〜（13）C组成和正构烷烃的分布均表明，沼泽植物可能对梅岛盐沼沉积物中的有机物贡献很大。这表明盐沼在河口及邻近沿海水域的养分和有机碳循环中起着重要作用。

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