δ13C signature of organic carbon in estuarine bottom sediment as an indicator of carbon export from adjacent marshes
δ13C signature of organic carbon in estuarine bottom sediment as an indicator of carbon export from adjacent marshes
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河口底部沉积物中有机碳的 δ13C 特征作为邻近沼泽碳输出的指标
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
C. Lindau
中科院分区：
文献类型：
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作者：
R. Delaune;C. Lindau
利用路易斯安那州巴拉塔里亚盆地河口底部沉积物有机碳的δ 13 C特征估算了邻近沼泽的碳通量。测定了该盆地植物、土壤和沉积物的稳定碳同位素组成。沼泽植被的δ 13 C含量变化范围为-26.3 ~-27.8%（上游C3淡水植被）和-13.0 ~-13.3%（下游C4植被）。高有机沼泽土的δ 13 C含量与植被的δ 13 C含量相近。开放水体底质有机碳的δ 13 C含量变化范围为27.3（淡水）~ 16.4（盐沼池塘底质）。咸化区沉积物中有机碳的13 C特征与水体的大小相对应。较小的盐沼池塘含有δ 13 C值接近C4植物互花米草的沉积物。结果表明，浮游植物，而不是互花米草是可能的有机物来源的底部沉积物的较大的海湾附近的海岸（如卡米纳达湾）。
The δ13C signature of organic carbon in estuarine bottom sediment in Louisiana Barataria Basin was used for estimating carbon flux from adjacent marsh. The stable carbon isotope composition of plants, soils and sediments from the basin were determined. The δ13C content of marsh vegetation ranged from -26.3 to -27.8% for C3 freshwater vegetation in the upper basin to -13.0 to -13.3% for C4 vegetation in the lower basin. The δ13C content of the highly organic marsh soils were similar to δ13C content of vegetation present. The δ13C content of organic carbon from bottom sediment of open water bodies ranged from 27.3 in the upper basin (freshwater) to 16.4 in bottom sediment of salt marsh ponds. The13C signature of organic carbon in bottom sediment from saline regions corresponded to the size of the body of water. The smaller salt marsh ponds contain sediment with δ13C values close to that of the C4 plantSpartina alterniflora. Results suggest that phytoplankton rather thanSpartina alterniffora is the likely organic source in bottom sediment of the larger bay near the coast (e.g. Caminada Bay).