The Geochemistry of Amazonian Peats
The Geochemistry of Amazonian Peats
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DOI：
10.1007/s13157-014-0552-z
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发表时间：
2014-10-01
期刊：
影响因子：
2
通讯作者：
Roucoux, Katherine H.
中科院分区：
文献类型：
--
作者：
Lawson, Ian T.;Jones, Timothy D.;Roucoux, Katherine H.
泥炭的化学、物理和古植物组成可以用来推断泥炭地的历史和目前在其中运作的过程。在这里，我们提出了新的数据，从秘鲁亚马逊河流域的一个低地棕榈沼泽，Quistococha，泥炭序列的地球化学。我们表明，通过与亚化石花粉数据从同一序列的比较，在沉积环境的变化导致泥炭性能，包括木质素含量，C/N比，和丰富的几种金属阳离子的变化，但这些属性被改变后沉积过程在很大程度上。N，K，Ca，Mg和Na的浓度在序列的顶部1.5米的上升趋势可能反映了养分吸收和循环的常设生物量。锰和铁浓度的上升趋势表明，有限的氧化泥炭可能会发生类似的深度。与其他已发表记录的比较表明，这种深层生物变化可能是热带森林泥炭的特征。
The chemical, physical and palaeobotanical composition of peat can be used to infer the history of a peatland and the processes presently operating within it. Here we present new data on the geochemistry of a peat sequence from a lowland palm swamp, Quistococha, in Peruvian Amazonia. We show, through comparison with subfossil pollen data from the same sequence, that changes in the depositional environment cause changes in peat properties including lignin content, C/N ratios, and the abundance of several metal cations, but that these properties are altered by post-depositional processes to a large extent. An upward trend in the top 1.5 m of the sequence in the concentrations of N, K, Ca, Mg and Na probably reflects nutrient uptake and cycling by the standing biomass. Upward trends in Mn and Fe concentrations suggest that limited oxygenation of the peat may occur to a similar depth. Comparison with other published records suggests that such deep biological alteration may be characteristic of tropical forested peats.