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Carbon storage change and δ13C transitions of peat columns in a partially forestry-drained boreal bog
Plant and Soil ( IF 4.9 ) Pub Date : 2019-12-14 , DOI: 10.1007/s11104-019-04375-5
Hannu Nykänen , Antti J. Rissanen , Jukka Turunen , Teemu Tahvanainen , Heikki Simola

In forestry-drained peatlands, drying leads to changes in C cycling which could affect peat δ13C. Furthermore, the δ13C profile of the entire peat column may reveal effects of earlier climatic periods. We measured peat δ13C and C inventories in adjacent peat profiles, two collected from undrained and two from the drained side of a bog that was partially ditch-drained 37 years earlier. The cores were sliced into 10-cm subsamples for analyses; matching of the profiles based on surface levelling, peat stratigraphic correlation and a horizontal ash layer found in both profiles. Surface subsidence of 30 cm was observed in the dried site and the uppermost 160 cm in the undrained site contained an excess of 5.9 kg m−2 of C compared with the corresponding strata of the ditch-drained site. The δ13C values increased but markedly only in the thin surface layer of the drained site, indicating low δ13C of the missing C (ca. –30‰). In the deeper strata, dating to Mid-Holocene, high dry bulk density, C%, N%, humification index and low C/N ratio were connected to low δ13C of peat. Drainage of 37 years increased δ13C values in the upper peat profile of the drained bog and led to the selective loss of 13C depleted C. Results indicate that C balance studies can be aided by C isotope analyses. Low δ13C values in the peat profile indicate the existence of a wet fen stage during the moist and warm period during Mid-Holocene.

中文翻译:

部分林业排水的北方沼泽中泥炭柱的碳储存变化和δ13C转变

在林业排水的泥炭地中,干燥导致 C 循环的变化,这可能影响泥炭 δ13C。此外,整个泥炭柱的 δ13C 剖面可能揭示早期气候时期的影响。我们测量了相邻泥炭剖面中的泥炭 δ13C 和 C 存量,其中两个是从不排水的,两个是从 37 年前部分排水沟排水的沼泽的排水侧收集的。岩心被切成 10 厘米的子样品用于分析;基于表面平整度、泥炭地层相关性和在两个剖面中发现的水平灰层来匹配剖面。在干燥场地观察到 30 cm 的地表下沉,与沟渠排水场地的相应地层相比,不排水场地最上面的 160 cm 含有超过 5.9 kg m-2 的 C。δ13​​C 值增加但仅在排水场地的薄表层显着增加,表明缺失 C 的 δ13C 较低(约 –30‰)。在更深的地层中,年代为中全新世,高干容重、C%、N%、腐殖化指数和低 C/N 比与低 δ13C 的泥炭有关。37 年的排水增加了排水沼泽上部泥炭剖面中的 δ13C 值,并导致 13C 耗尽的 C 的选择性损失。结果表明 C 平衡研究可以通过 C 同位素分析得到帮助。泥炭剖面中的低 δ13C 值表明在中全新世的潮湿和温暖时期存在湿沼气阶段。37 年的排水增加了排水沼泽上部泥炭剖面中的 δ13C 值,并导致 13C 耗尽的 C 的选择性损失。结果表明 C 平衡研究可以通过 C 同位素分析得到帮助。泥炭剖面中的低 δ13C 值表明在中全新世的潮湿和温暖时期存在湿沼气阶段。37 年的排水增加了排水沼泽上部泥炭剖面中的 δ13C 值,并导致 13C 耗尽的 C 的选择性损失。结果表明 C 平衡研究可以通过 C 同位素分析得到帮助。泥炭剖面中的低 δ13C 值表明在中全新世的潮湿和温暖时期存在湿沼气阶段。
更新日期:2019-12-14
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