Freezing of Chalk Cryomorphic Soil Complexes of the Orenburg Oblast: Temperature Regime and Cryogenic Processes in Soil Profile

IF 1.4 4区农林科学 Q4 SOIL SCIENCE Eurasian Soil Science Pub Date : 2024-06-03 DOI:10.1134/s1064229324600209

D. G. Polyakov, A. G. Ryabukha, T. A. Arkhangelskaya, I. V. Kovda

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Abstract

The temperature dynamics of conjugated soils of a paleocryogenic soil complex on chalk deposits in the Orenburg oblast is studied. Temperature measurements are combined with the study of cryogenic characteristics. The freezing point of soil moisture has been measured in laboratory. The temperature field within the soil complex is most heterogeneous. In the fall–winter season, the soil of microhighs is colder than the soils of microlows and microslopes; however, the microslope warms up faster than the microelevation and microlow in the spring–summer season. The differences between the temperature of soils in the frozen layer of microhighs and microlows reach –4.5°C at the beginning of freezing (December 15, 2019 at a depth of 15 cm), –4.0°C at the end of winter (February 10–11, 2020 at a depth of 5 cm), and –6.5°C during thawing (March 21–23, 2020 at a depth of 5 cm). The differences in the temperature regime along the microrelief are accompanied by the differences in the moisture distribution along the profile and determine the manifestation of cryogenic processes. The soils of microhighs freeze deeper and lens-type cryostructure forms in the entire frozen layer; this is accompanied by frost heaving, cryogenic sorting of coarse fragments, and formation of a crust on the soil surface ensuring preservation of the microtopography and soil cover pattern of chalk polygons. Cryogenic processes determine the formation of a platy soil structure in microhighs. Freezing in microlows is blocked in the middle part of the profile because of relatively high soil temperatures and low soil freezing points. The cryogenic characteristics and processes described in microhighs are unobservable in microlows.

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奥伦堡州白垩低温土壤复合体的冻结：土壤剖面的温度变化和低温过程

摘要研究了奥伦堡州白垩矿床上古成土复合体共轭土壤的温度动态。温度测量与低温特性研究相结合。在实验室中测量了土壤水分的凝固点。土壤复合体内部的温度场是最不均匀的。在秋冬季节，微丘土壤比微丘和微坡土壤更冷；但在春夏季节，微坡土壤比微丘和微丘土壤升温更快。在冻结初期（2019 年 12 月 15 日，深度为 15 厘米），微高地和微斜坡冻结层土壤的温度差达到-4.5°C，在冬季结束时（2020 年 2 月 10-11 日，深度为 5 厘米）达到-4.0°C，在解冻期（2020 年 3 月 21-23 日，深度为 5 厘米）达到-6.5°C。微地层沿线温度机制的差异伴随着剖面上水分分布的差异，并决定了低温过程的表现形式。微高地的土壤冻结较深，整个冻结层形成透镜状低温结构；伴随着霜冻起伏、粗颗粒低温分选以及土壤表面结壳的形成，确保了微地形和白垩多角形土壤覆盖模式的保存。低温过程决定了微丘中板状土壤结构的形成。由于土壤温度相对较高，土壤凝固点较低，微低处的冻结在剖面中部受阻。在微丘中描述的低温特征和过程在微流中是无法观测到的。

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来源期刊

Eurasian Soil Science 农林科学-土壤科学

CiteScore

2.70

自引率

35.70%

发文量

137

审稿时长

12-24 weeks

期刊介绍： Eurasian Soil Science publishes original research papers on global and regional studies discussing both theoretical and experimental problems of genesis, geography, physics, chemistry, biology, fertility, management, conservation, and remediation of soils. Special sections are devoted to current news in the life of the International and Russian soil science societies and to the history of soil sciences. Since 2000, the journal Agricultural Chemistry, the English version of the journal of the Russian Academy of Sciences Agrokhimiya, has been merged into the journal Eurasian Soil Science and is no longer published as a separate title.