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Soils of cryogenic forms of the tundra and forest-tundra zones microrelief in the North-Eastern Yakutia

R.V. Desyatkin1А.Z. Ivanova1,*, М.V. Okoneshnikova1А.R. Desyatkin1,2N.V. Filippov1
DOI 10.31242/2618-9712-2022-27-1-98-108

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1Institute for biological problems of cryolithozone SB RAS, Yakutsk, Russia
2Melnikov permafrost institute SB RAS, Yakutsk, Russia
*[email protected]

Received 20.01.2022
Accepted 18.02.2022

Citation
Desyatkin R.V., Ivanova А.Z., Okineshnikova М.V., Desyatkin А.R., Filippov N.V. Soils of cryogenic forms of the tundra and forest-tundra zones microrelief in the North-Eastern Yakutia // Arctic and Subarctic Natural Resources. 2022, Vol. 27, No. 1. P. 98–108. (In Russ.) https://doi.org/10.31242/2618-9712-2022-27-1-98-108

Abstract. The study investigated soils of the tundra and forest-tundra parts of the Kolyma River basin (68°44’–69°03’N, 160°59’–161°22’E). These soils are developed on the polygonal ridged and hummockand-hollow cryogenic forms of microrelief. The territory of the Kolyma accumulative lowland is composed of the Quaternary deposits of the Middle and Late Pleistocene age. The depth of the seasonally thawed layer depends on landscape conditions and varies from 0.2 to 1.0 m, with average values of 0.3–0.7 m. Soils of the polygonal ridged tundra (near Pokhodsk) are represented on the ridges by acidic permafrost tundra gley peat soils [ОТ–Т–АТg–Вg┴], which occur in a complex with permafrost peat soils of microdepressions (polygons) [ОТ–Т┴]. These are acidic soils with high values of ignition loss in the upper organogenic horizons. In the forest-tundra, on the border with the northern taiga (near Chersky), the soil surface is characterized by a hummock-and-hollow microrelief caused by permafrost cracking. Here, the studied soils are represented by a conjugate combination of permafrost taiga gleyic soils inside of depressions [О–Т– АВf–Вg–ВСg┴] permafrost taiga non-gley soils of hummock [О–Тh–АВ–В(ВС)┴]. The soil described at the top of the hummock practically has no signs of gleying and is poorly differentiated; the soil of the depression is gleyed and is characterized by the presence of signs of organic matter accumulation in the suprapermafrost layer.

Keywords: cryogenic forms, microrelief, soil formation, soil morphology, permafrost, North-Eastern Yakutia.

Acknowledgements. The research was supported by the Russian Fund for Basic Research (grant of the topic 19-29-05151; registration number AAAA-A20-120061190009-9).


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