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首页> 外文期刊>Soil Horizons >Cryoturbation in the Central Brooks Range, Alaska.
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Cryoturbation in the Central Brooks Range, Alaska.

机译：在阿拉斯加中央布鲁克斯山脉的低温扰动。

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Cryoturbation in permafrost-affected soils is important to many Arctic biogeochemical processes and critical to the appropriate classification of Gelisols. Standardized methodologies for describing the soils formed from these processes and knowledge regarding the time scales at which they operate continue to evolve. Twenty-six profiles were described across a transect in the Midas Lake region of the Central Brooks Range of Alaska using a modified version of the standard USDA and Turbel description protocol that is appropriate for work in wilderness areas. Profile descriptions and associated field data were aggregated and generalized to reveal major trends and relationships in horizonation between cryoturbated and noncryoturbated soils on the transect. A conceptual model for the geomorphic relationships of cryoturbated and noncryoturbated soils on this landscape was developed. In addition to a landscape-scale perspective, individual profiles were described on patterned ground features at a location where cryoturbated horizons were strongly expressed. Samples from these profiles were analyzed for cesium-137 (137Cs) activity, and it was found that the surficial activity of this fallout radioisotope varied strongly by material type and position on the patterned ground microtopography. These differences suggest that the use of fallout isotopes, such as 137Cs, when combined with quantitative profile descriptions and a standardized description protocol, may significantly improve our understanding of the spatial distribution and mechanisms of cryoturbation.
机译：受多年冻土影响的土壤中的低温扰动对于许多北极的生物地球化学过程很重要，并且对胶质溶胶的适当分类也至关重要。用于描述由这些过程形成的土壤的标准化方法以及有关其运行时程的知识不断发展。使用适用于野外工作的标准USDA和Turbel描述协议的修改版本，在阿拉斯加中央布鲁克斯山脉的Midas湖地区的一个横断面上描述了26个剖面。概要描述和相关的现场数据经过汇总和归纳，揭示了该样带上冻干和非冻干土壤之间的主要趋势和层位关系。建立了该景观上冻土和非冻土的地貌关系的概念模型。除了景观尺度的视角外，还对强烈表达低温扰动层位的位置的图案化地面特征进行了描述。分析了这些剖面中的样品的铯137（ 137 Cs）活性，发现该辐射放射性同位素的表面活性随图案类型的地面微形貌上的物质类型和位置而有很大不同。这些差异表明，将 137 Cs等放射性同位素与定量分布描述和标准化描述协议结合使用时，可能会大大改善我们对冷冻扰动的空间分布和机理的理解。

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