Sphagnum δ13C values as indicators of palaeohydrological changes in a peat bog
Sphagnum δ13C values as indicators of palaeohydrological changes in a peat bog
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DOI：
10.1177/0959683609350389
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发表时间：
2010-03-01
期刊：
影响因子：
2.4
通讯作者：
Helie, Jean-Francois
中科院分区：
文献类型：
--
作者：
Loisel, Julie;Garneau, Michelle;Helie, Jean-Francois
研究了加拿大北部晚全新世泥炭沼泽的泥炭地层，评价了Sphagnum δ C-13值作为地表水分代用指标的潜力。同位素测量结果与由变形虫推断的地下水位重建、植物大化石组合和由比色腐殖化推断的过去分解水平进行了比较。AMS放射性碳测年与Pb-210测年相结合，确定泥炭年代。尽管泥炭地碳分异过程的机制尚不清楚，但我们证明Sphagnum δ C-13值具有古水文重建的潜力，因为同位素值所呈现的变化通常可以与其他代用记录相关联，特别是在干旱时期。
Late-Holocene peat stratigraphy of a Canadian boreal peat bog was examined to evaluate the potential of Sphagnum delta C-13 values as surface moisture proxy indicators. Isotopic measurements were compared to testate amoebae-inferred water-table depth reconstructions, plant macrofossil assemblages and past decomposition levels inferred by colorimetric humification. AMS radiocarbon dates were coupled with Pb-210 dates to establish peat chronology. Although the mechanisms underlying carbon fractionation processes in peatlands are not well understood, we demonstrate that Sphagnum delta C-13 values have potential for palaeohydrological reconstructions, since variations presented by the isotopic values can generally be correlated with the other proxy records, especially during drier episodes.