Shestakovo site of Western Siberia (Russia): Pedogenic features, humic substances and paleoenvironment reconstructions for last 20–25 ka

Dergacheva, M. I.; Fedeneva, I.N.; Bazhina, Natalia; Nekrasova, Olga; Zenin, V. N.

doi:10.1016/j.quaint.2015.10.087

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…This methodology derives from a humus substance's ability to reflect its environment in its composition and properties, preserving this information for a long geological time [42][43][44]. In addition to information taken from soil samples isolated from humic acid characteristics (Table 1), our results indicate that both recent and ancient soils had been formed in similar temperature conditions with different humidity levels.…”

Section: Methodsmentioning

confidence: 83%

Lanthanides and Actinides in Humic Acids of Soils and Paleosols of Forest-Steppe Conditions in the Southern Urals

et al. 2018

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This article analyzes the lanthanum, cerium, samarium, europium, terbium, ytterbium, lutetium, uranium, and thorium content in humic acids within soil and paleosol surface horizons from the southern steppe in the Southern Urals. Research demonstrates similar accumulation levels of these elements in paleosols isolated from both the active medium between 3.6 and 3.3 thousand years ago and in recent background soils. Despite the lack of significant differences, research has shown a growing content among the rarest metals in the series "the buried paleosols-man-modified paleosols of settlement-recent background soils". Research has detected the lowest content of La, Ce, Sm, Eu, Yb, Lu, and Th in preparations of humic acids of recent background soils. This reveals a close content to most elements in humic acids of paleosols buried under barrows and ancient settlement paleosols. Additionally, it indicates the virtual absence of anthropogenic impact on binding lanthanides and actinides by humic acids in ancient times. The contribution of humic acids into the common pool for each element was evaluated using a special approach. Research showed that there was less than half the share of elements associated by humic acids of paleosols than in the recent background chernozems in the total pool of lanthanides and actinides. This article considers the prospects of using humic acids of recent and ancient soils in identifying behavioral patterns of metal complexes through time.

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Section: Methodsmentioning

confidence: 83%

Lanthanides and Actinides in Humic Acids of Soils and Paleosols of Forest-Steppe Conditions in the Southern Urals

et al. 2018

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“…Изучено влияние кислотности среды на характер хроматограмм препаратов ФК, выделенных из основных типов почв Республики Коми. Показано, что в области высоких значений рН элюента (9)(10)(11)(12)(13) отсутствие фракционирования связано с ассоциацией ФК, изменением их конформации и эффектом "сверх-эксклюзии". Элюирование дистиллированной водой (рН=6,5) позволяет проводить разделение ФК на две фракции с молекулярными массами ≥ 5 kDa и 1-2 kDa.…”

Section: методы количественный анализ ммр препаратов гк и фк выполнен с помощью жидкостной эксклюзионной хроматографии (гель-хроматографиunclassified

“…№ 4. e160. doi: 10.31251/pos.v4i4.160 ВВЕДЕНИЕ Одним из важнейших компонентов почв, влияющих на биологические, физические, физикохимические свойства и, в целом, на плодородие почв, является органическое вещество, глубокое и всестороннее изучение которого представляет собой важную задачу в теоретическом и практическом почвоведении (Орлов, 1996;Dergacheva et al, 2016). Гуминовые кислоты (ГК) и фульвокислоты (ФК) представляют собой полидисперсные смеси сложных по структуре высокомолекулярных веществ, поэтому их фракционирование является одной из главных проблем химии гумуса (Perminova et al, 2005;Безносиков, Лодыгин, 2010).…”

Section: ключевые слова: гуминовые кислоты; фульвокислоты; полидисперстность; эксклюзионная хроматография; подзолистые болотно-подзолистыunclassified

Molecular-mass distribution of humus acids of taiga soils

Лодыгин

Василевич

2021

Počvy okruž. sreda

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Purpose of the study: to reveal the influence of hydromorphism and agricultural use on the molecular-mass distribution (MMD) of humic (HAs) and fulvic acids (FAs) isolated from the soils of the European northeast of Russia. To assess the influence of the acidity of the medium on the MWD of FAs. Place and time of the event. The studies were carried out on the territory of the middle taiga (Maksimovsky station of the Institute of Biology of the Federal Research Center of the KSC UB RAS, located 8 km west of the city of Syktyvkar and the field of the Syktyvkar state farm, 5 km south-west of Syktyvkar, on the watershed of the Sysola and Vazhel-yu rivers) and northern taiga (3 km west of the Troitsko-Pechorsk station). The objects of the study were humic substances isolated from typical podzolic (Eutric Albic Retisol (Loamic)), gleypodzolic (Eutric Albic Stagnic Retisol (Loamic)), peaty-podzolic surface-gleyed (Eutric Albic Stagnic Histic) Retisol (Loamic Eutric Albic Retisol (Loamic)) soils. The soil sampling period is from 1 to 30 August 2014. Methodology. Quantitative analysis of the MMD of HA and FA preparations was performed using liquid size exclusion chromatography (gel chromatography) on Sephadex G-25 and G-100 gels with continuous automatic registration of the optical density of the eluate (λ = 280 nm) in a quartz flow cell, K 9 × 60 cm column (Pharmacia, Sweden). Distilled water, 0.05 M NaOH solution, and Tris-HCl buffer with pH = 8.2 were used as the eluent. Main results. Studies of the MMD of humic substances have been carried out. It was found that HAs contain three fractions with different molecular weights: ≥ 150 kDa, 73–80 kDa, and 13–23 kDa; FAs – two fractions: ≥ 5 kDa, 1–2 kDa. The low molecular weight of FAs, together with a large amount of oxygen-containing functional groups, contributes to their better solubility and migration ability in soils. The HAs of automorphic soils are characterized by a high content of low molecular weight fractions, and the proportion of the high molecular weight fraction in the HAs of the litter is 1.5–2.0 times higher than in the HAs of the podzolic horizon, which may be due to the migration of the low molecular weight fraction down the profile. The high proportion of the acidic low molecular weight fraction in the podzolic horizon promotes the decomposition of soil minerals and their leaching into the illuvial horizon. The influence of agricultural use of soils on the fractional composition of humic compounds is estimated. A sharp increase in the share of the high molecular weight fraction in the preparations of HAs of arable podzolic soil by 2–4 times compared with the HAs of virgin podzolic soils was noted, which is due to the cultivation of the arable horizon, the nature of the incoming plant residues and the increased microbiological activity of the developed soils. The effect of acidity of the medium on the character of chromatograms of FA preparations isolated from the main types of soils of the Komi Republic was studied. It has been shown that in the region of high pH values of the eluent 9–13, the absence of fractionation is associated with the association of FAs, a change in their conformation, and the effect of “over-exclusion”. Elution with distilled water (pH = 6.5) allows the separation of FAs into two fractions with molecular weights ≥ 5 kDa and 1–2 kDa.

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“…Как уже неоднократно обсуждалось, такими значимыми и достоверными признаками палеопедогенеза, содержащими информацию об условиях природной среды прошлого, сохраняющимися в течение геологического времени и позволяющими проводить палеореконструкции, независимо от сохранности других параметров палеопочв, являются характеристики системы почвенных гумусовых веществ, используемые при диагностике типа древнего почвообразования и лежащие в основе педогумусового метода реконструкции условий природной среды прошлого [6], [14]- [16] и др.…”

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Humus of Postlithogenous and Synlithogenous Paleosols and Its Use at Paleoecological Reconstructions

Fedeneva¹,

Dergacheva²

2017

VOGU

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Shestakovo site of Western Siberia (Russia): Pedogenic features, humic substances and paleoenvironment reconstructions for last 20–25 ka

Cited by 7 publications

References 8 publications

Lanthanides and Actinides in Humic Acids of Soils and Paleosols of Forest-Steppe Conditions in the Southern Urals

Lanthanides and Actinides in Humic Acids of Soils and Paleosols of Forest-Steppe Conditions in the Southern Urals

Molecular-mass distribution of humus acids of taiga soils

Humus of Postlithogenous and Synlithogenous Paleosols and Its Use at Paleoecological Reconstructions

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