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To the assessment of the phosphate status of permafrost soils of Southern Yakutia

A.P. ChevychelovO.G. Zakharova
DOI 10.31242/2618-9712-2020-25-1-5

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Institute for Biological Problems of Cryolithozone, Siberian Branch of the Russian Academy of Sciences, Yakutsk, Russia
[email protected]

Received 20.01.2020
Accepted 02.03.2020

Citation
Chevychelov A.P., Zakharova O.G. To the assessment of the phosphate status of permafrost soils of Southern Yakutia // Arctic and Subarctic Natural Resources. 2020, Vol. 25, N 1. P. 51–59. https://doi.org/ 10.31242/2618-9712-2020-25-1-5

Abstract. The phosphate status of five types of permafrost soils in Southern Yakutia is studied for the first time: the content and intra-profile distribution of total phosphorus, as well as mineral and mobile phosphates determined according to Chang-Jackson and Ginsburg-Artamonova methods, respectively. The study revealed that the weighted mean content of total phosphorus in examined soils was not very high, and varied from 290 to 474 mg/kg. According to the total phosphorus content, these types of soils were arranged into the following descending sequence: pale-brown (474 mg/kg); podzolic alpha-humus (429 mg/kg) ; muck-calcareous (320 mg/kg) ≈ podzolic typical (318 mg/kg) > sod-calcerous (290 mg/kg). At the same time, the intra-profile distribution of total phosphorus in podzolic alpha-humus soils had an eluvial-illuvial pattern, podzolic typical and sod-calcerous soils had an accumulative eluvial distribution pattern, palebrown soils were characterized by an eluvial distribution, and muck-calcerous soils had an accumulative distribution pattern.It was demonstrated that landscape and climatic conditions of southern Yakutia favor the development of primarily acidic permafrost soils unsaturated with exchangeable bases, as well as long-seasonal permafrost soils of eluvia row, which are characterized by low biological activity. These soils are also characterized by the low content of mobile phosphates, with the average value of 2,5-6,7 mg P2O5/100 g of soil and not higher than 1-2 % of its total content.It was also shown that the total content of loosely linked phosphates and calcium phosphates, which are more readily utilized by plants, is generally low in the examined soils and is mainly less than 5 % of their total content. At the same time, aluminum phosphates (Al-P) and iron phosphates (Fe-P) that are hardly available for plants prevail in the mineral phosphatecomposition of the soils of Southern Yakutia, with the dominance of the latter fraction. The content of Al-P and Fe-P in these soils varied significantly, with the maximum variations of 40 and 60 % of their total content, respectively.

Key words: permafrost soils, composition and properties, phosphates, content, distribution.

Acknowledgements. The article is based on the project "Fundamental and applied aspects of studying the diversity of the flora of Northern and Central Yakutia" (0376-2016-0001; reg. number AAAA17-117020110056-0)

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