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Importance of Cryoturbation in Redistributing Organic Carbon in Permafrost-Affected Soils

机译:低温扰动在多年冻土影响下的土壤中重新分配有机碳的重要性

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摘要

This study examined the amount of soil organic carbon (SOC) incorporated by cryoturbation into the active layer and near-surface permafrost of Turbels from northern Alaska. An analysis of 21 pedons revealed that an average of 55% of the SOC density of the active layer and near-surface permafrost could be attributed to redistribution from cryoturbation. Cryoturbation occurs most strongly under conditions of poor drainage, where the parent materials are enriched in silt, and where frost boils are present. Based on published radiocarbon dates of buried SOC, cryoturbation was particularly important during periods of the mid-Holocene when the arctic underwent warming. These results suggest that continued warming of the arctic could accelerate cryoturbation and enable the soil to store more SOC than at present, thereby mitigating some of the loss of CO2 to the atmosphere from increased soil respiration.
机译:这项研究调查了低温扰动并入阿拉斯加北部Turbels的活动层和近地表永久冻土中的土壤有机碳(SOC)的量。对21个 岩钉的分析表明,平均 活性层和近地表永久冻土的SOC密度的55%可以归因于 从低温扰动中重新分配。在排水不畅,母体 材料富含淤泥且存在霜沸腾的条件下,低温 最容易发生。 在北极经历变暖的全新世中期期间,地下SOC的放射性碳日期,低温扰动尤其重要。这些结果表明, 持续的北极变暖可能会加速低温扰动 并使土壤中的SOC超过目前的水平,从而使 得以缓解 土壤呼吸增加而使CO 2 损失到大气中。

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  • 来源
    《Soil Science Society of America Journal》 |2007年第4期|1335-1342|共8页
  • 作者

    J. G. Bockheim;

  • 作者单位

    Dep. of Soil Science, Univ. of Wisconsin, 1525 Observatory Dr., Madison, WI 53706-1299;

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  • 正文语种 eng
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