Radiocarbon evidence for the importance of surface vegetation on fermentation and methanogenesis in contrasting types of boreal peatlands
Radiocarbon evidence for the importance of surface vegetation on fermentation and methanogenesis in contrasting types of boreal peatlands
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DOI：
10.1029/2008gb003274
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发表时间：
2008-12-27
影响因子：
5.2
通讯作者：
Cooper, W. T.
中科院分区：
文献类型：
--
作者：
Chanton, J. P.;Glaser, P. H.;Cooper, W. T.
我们发现了一个一致的分布模式的放射性碳溶解有机碳（DOC），溶解无机碳（DIC），甲烷复制在空间和时间尺度上的北方泥炭地从明尼苏达州到阿拉斯加。DOC的C-14含量是相对现代的整个泥炭柱，深度为3米。在莎草占主导地位的泥炭地，C-14的呼吸产物，CH 4和DIC的含量基本相同，并类似于DOC。然而，在泥炭藓和木本植物为主的泥炭地，很少莎草，呼吸产物是类似的，但中间的C-14含量的固相泥炭和DOC。初步数据表明，在孔隙水DOC的质的差异，这取决于莎草覆盖的程度，与假设相一致，即DOC在莎草为主的泥炭地比DOC泥炭地泥炭藓或其他维管植物占主导地位。这些数据支持DOC的分子水平分析的超高分辨率质谱法，这表明更显着的变化与深度的组成DOC在莎草为主的泥炭地孔隙沃茨相对于观察到的变化DOC泥炭藓占主导地位。较高的反应性DOC从莎草占主导地位的泥炭地可能是一个功能，无论是不同的源材料或环境因素，与丰富的莎草在泥炭地。
We found a consistent distribution pattern for radiocarbon in dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), and methane replicated across spatial and temporal scales in northern peatlands from Minnesota to Alaska. The C-14 content of DOC is relatively modern throughout the peat column, to depths of 3 m. In sedge-dominated peatlands, the C-14 contents of the products of respiration, CH4 and DIC, are essentially the same and are similar to that of DOC. In Sphagnum- and woody plant-dominated peatlands with few sedges, however, the respiration products are similar but intermediate between the C-14 contents of the solid phase peat and the DOC. Preliminary data indicates qualitative differences in the pore water DOC, depending on the extent of sedge cover, consistent with the hypothesis that the DOC in sedge-dominated peatlands is more reactive than DOC in peatlands where Sphagnum or other vascular plants dominate. These data are supported by molecular level analysis of DOC by ultrahigh-resolution mass spectrometry that suggests more dramatic changes with depth in the composition of DOC in the sedge-dominated peatland pore waters relative to changes observed in DOC where Sphagnum dominates. The higher reactivity of DOC from sedge-dominated peatlands may be a function of either different source materials or environmental factors that are related to the abundance of sedges in peatlands.