Storage, landscape distribution, and burial history of soil organic matter in contrasting areas of continuous permafrost
Storage, landscape distribution, and burial history of soil organic matter in contrasting areas of continuous permafrost
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DOI：
10.1657/aaar0014-027
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发表时间：
2015-02-01
影响因子：
2
通讯作者：
Kuhry, P.
中科院分区：
文献类型：
--
作者：
Palmtag, J.;Hugelius, G.;Kuhry, P.
本研究描述和比较了两个地区的连续多年冻土，在东北格陵兰（Zackenberg研究基地）和西伯利亚东北部（Cherskiy和Shalaurovo研究基地）的低地地区的山区土壤有机质（SOM）的数量和特性。我们的评估是基于分层随机土壤剖面的库存到1米深，物理化学，元素和放射性碳测年分析。在东北格陵兰研究中心，上层土壤中估计的平均土壤有机碳（SOC）储量为8.3 +/- 1.8 kg C m（-2），而在东北西伯利亚研究中心为20.3 +/- 2.2 kg C m（-2）和30.0 +/- 2.0 kg C m（-2）（95%置信区间）。在格陵兰东北部的高北极地区的SOC存储量较低，这在很大程度上可以解释的事实，即59%的研究区域位于海拔较高，大多是贫瘠的土地，因此非常低的SOC含量。此外，有机碳丰富的沼泽和沼泽地在格陵兰东北部的景观中所占的比例（类似于3%）比西伯利亚东北部（类似于20%）要小得多。深埋在矿质土壤层中的富碳物质对总SOC储存的贡献在东北格陵兰站点（类似于13%）低于东北西伯利亚站点（类似于24%-30%）。埋藏SOM似乎一般分解在东北格陵兰岛比东北西伯利亚，我们涉及到不同的埋葬机制，在这些地区盛行。
This study describes and compares soil organic matter (SOM) quantity and characteristics in two areas of continuous permafrost, a mountainous region in NE Greenland (Zackenberg study site) and a lowland region in NE Siberia (Cherskiy and Shalaurovo study sites). Our assessments are based on stratified-random landscape-level inventories of soil profiles down to 1 m depth, with physico-chemical, elemental, and radiocarbon-dating analyses. The estimated mean soil organic carbon (SOC) storage in the upper meter of soils in the NE Greenland site is 8.3 +/- 1.8 kg C m(-2) compared to 20.3 +/- 2.2 kg C m(-2) and 30.0 +/- 2.0 kg C m(-2) in the NE Siberian sites (95% confidence intervals). The lower SOC storage in the High Arctic site in NE Greenland can be largely explained by the fact that 59% of the study area is located at higher elevation with mostly barren ground and thus very low SOC contents. In addition, SOC-rich fens and bogs occupy a much smaller proportion of the landscape in NE Greenland (similar to 3%) than in NE Siberia (similar to 20%). The contribution of deeper buried C-enriched material in the mineral soil horizons to the total SOC storage is lower in the NE Greenland site (similar to 13%) compared to the NE Siberian sites (similar to 24%-30%). Buried SOM seems generally more decomposed in NE Greenland than in NE Siberia, which we relate to different burial mechanisms prevailing in these regions.