The phosphate state of long-term seasonally frozen ordinary chernozem of Western Siberia and frozen ordinary chernozem of Central Yakutia was studied using a complex of soil methods, such as comparative geographical, comparative analytical and profile genetic in combination with standard analytical techniques. It was shown that, despite the similarity of the morphological structure and properties of these soils, their phosphate state differed significantly. Thus, with a generally similar content of total phosphorus, amounting to 67.5-110.1 in the chernozem of Western Siberia, and 98.0–167.3 mg P₂O₅/100 g of soil in the chernozem of Yakutia, the proportion of organophosphates in the first soil was lower than in the second. Thus, in the chernozem of Western Siberia, phosphates of organic compounds amounted to 44.6-91.4 mg P₂O₅/100 g of soil, or relatively 66.1- 83,0 % of the total amount of phosphates, while in the chernozem of Central Yakutia, respectively – 68.4-123.7 or 65.8-73.9 %. The studied chernozems of Western Siberia and Central Yakutia also differed significantly in both the total amount and the relative content of individual fractions of mineral phosphates. The latter was especially evident for the iron phosphates and occluded aluminumiron phosphates fractions, the average contents of which in these soils differed by 21 and 5 times, respectively. During mathematical processing of the obtained data using the nonparametric Wilcoxon test, it was found that the content of all studied forms and fractions of phosphates in the studied chernozems differed statistically significantly with a confidence level of p=0,95 and p=0,99. It is assumed that the higher content of iron phosphates and occluded aluminum-iron phosphates fractions in the frozen chernozem of Central Yakutia compared to those noted in the frozen chernozem of Western Siberia is associated with the influence of the cryogenic ferruginization process.

Zakharova Olga Gavril'evna, Candidate of Sciences (Biology), Research Scientist, Institute for Biological Problems of Cryolithozone SB RAS, 41, Lenin st., Yakutsk, 677980, Russian Federation, e-mail: olya.choma@mail.ru

Chevychelov Aleksandr Pavlovich, Doctor of Sciences (Biology), Chief Research Scientist, Institute for Biological Problems of Cryolithozone SB RAS, 41, Lenin st., Yakutsk, 677980, Russian Federation, e-mail: chev.soil@list.ru

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