Differentiation of layered silicates and biogenic silica in meadow podbel soils of the Central Amur Lowland

Чижикова, Н. П.; Kharitonova, G. V.; Matyushkina, L. A.; Konovalova, N. S.; Stenina, A. S.

doi:10.1134/s1064229313080024

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Similar processes have been observed, for example, in highly weathered podbel (whitened) horizons of meadow podbel soils of the middle Amur River Valley . According to a previous study, the weathering of grass phytoliths resulted in the formation of fine spherical particles of opal silica of about 150-300 ηm (Chizhikova, 2013). No evidence of chemical weathering of the two other forms of biogenic silica, i.e.…”

Section: Resultsmentioning

confidence: 89%

Silica Microphorms in Soils Affected by Hydrothermal Activity on the Yellowstone Volcanic Plateau, USA

2018

Biogeosystem Technique

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Many prominent ecological characteristics of Yellowstone derive from its hotspot-induced uplift, including the moderate-to high-elevation terrain, the cool climate and deep snowfall. Heat from the hotspot rises upward and drives Yellowstone's famed geysers, hot springs and mud pots. The major soil-forming factors in the area are volcanic parent rocks -rhyolite and andesite -and lake sediments overlying rhyolite, cold temperatures, and deep snow in winter and low precipitation in summer. The purpose of the work was to study the effect of hydrothermal activitygeysers, hot springs and mud pots on the Yellowstone Plateau post-volcanic soils, developed on rhyolite, lake sediments and andesite. The sampling sites were chosen in areas both affected by hydrothermal activity -by mud pots, active geysers and the field of thermal waters and off the direct hydrothermal effect -Hayden Valley and the Lamar River Valley. Chemical weathering was a major feature of the affected soils. Near active mud pots, at pH 5.1-5.6, active rhyolite weathering resulted in abundant amorphous silica production and sequential thriving of diverse diatom algae. In soils on the lake sediments and close to the geysers, at low pH values (< 4), weathering was moderate and biogenic silica was presented mostly by shells of testate amoebae. The content of diatoms in these soils corresponded with that in the parent lake sediments. Similar conditions were observed for the soils on andesite in the Lamar River Valley. Biogenic silica was also found in the form of phytoliths, well-preserved in the productive grassland of the Hayden Valley, but significantly affected in the soils near active hydrotherms. Hydrothermal activity was a driving force of silicate mineral weathering and resulted in the thriving of diatoms on the plateau.

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Section: Resultsmentioning

confidence: 89%

Silica Microphorms in Soils Affected by Hydrothermal Activity on the Yellowstone Volcanic Plateau, USA

2018

Biogeosystem Technique

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“…The soddy-meadow soils (section 164) were applied at 50 m of the north in the Diadin village of the Sharur plain, Tumasli zone from descending inclined lowland of the Araz coast. [11][12][13][14][15] The soil stratums are the same for the morphogenetic structure and the blackish colors are found at Available Online at www.aextj.com Agricultural Extension Journal 2020; 4(1):26-33 the depth (35-40 cm). Only the upper layers are considered cultural-toamy stratums [ Table 1].…”

Section: Discussion and Analysis Of The Workmentioning

confidence: 99%

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2020

AEXTJ

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The silt fractions have a great impact in soil structural formation. If the soil-forming rocks do not disturb, crush, and weather, the soil-forming processes on them occur weakly, the organic substances cause the formation of the loamy stratums without completely turning. This mostly influences the initial soil-forming layers. The reproduction minerals in these soils cause initial minerals majority by occurring weakly. If these processes occur quickly, then they cause a gradual increase of the reproduction minerals and reduction of the initial minerals. The heights of the zones where the geographical spreading of such stratums is situated depend on levels.

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“…4) show significant differences in the hydrosorption capacity of WDC and AC, both at a low relative pressure of water vapor (p/p 0 ) and at an ultimate uptake (p/p s ). Important factors able to affect the value of the specific surface of the clay fractions are their clay mineral, HS and free iron contents [32][33][34]. /g, respectively, because of the predominance of minerals with rigid structures in its composition.…”

Section: Adsorption Characteristics and Specific Surface Of Wdc And Acmentioning

confidence: 99%

Effect of humic substances and clay minerals on the hydrosorption capacity of clay particles in meadow soils (Middle Priamurje, Far East of Russia)

Матюшкина

Kharitonova

2015

Chem. Biol. Technol. Agric.

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Background:The study of clay fractions is usually focused on water-dispersible clay (WDC), which is a good indicator of many soil processes involving water (water erosion, transfer and removal of nutrients and contaminants). Aggregated clay (AC) that remains after WDC extraction is also important, as it controls the formation of aggregates and their mechanical and water resistance. The aim of this study was a gradual extraction of WDC and AC fractions from periodically overmoistening meadow podbel (mollic planosol) and the study of the content and composition of humic substances and clay minerals in these fractions as well as their effect on the hydrosorption capacity. Results:The complete extraction of clay fractions showed that AC prevails over WDC along the entire profile and most evidently in the Ag horizon. Most of the organic matter is concentrated in AC. X-ray diffractometry and SEM analysis revealed a similar set of minerals in both fractions, but in different proportions. In the Ag and Elcg horizons, WDC is enriched with clastic components (fine-dispersed quartz, feldspars, amphiboles) and clay minerals with rigid structures (illite, kaolinite, chlorite), compared to AC. In the Btg1 horizon smectite prevails in both fractions. The specific surface, which characterizes the hydrosorption capacity of clays, of WDC is 28-95 m 2 /g less than that of AC. Maximal difference in specific surface of clays is found in the horizon Elcg, where AC has the highest content of free iron. Conclusions:The present study allowed defining the heterogeneity of the total clay in the periodically overmoistened meadow soil, which is manifested in differences in composition and properties of WDC and AC fractions. AC largely determines hydrosorption properties of soil due to a high content of organic matter and the predominance of swelling minerals in its composition, compared with WDC. The obtained data highlight the importance of studying clay fractions WDC and AC for the characteristics of differentiation and aggregation of the clay in soils.

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Differentiation of layered silicates and biogenic silica in meadow podbel soils of the Central Amur Lowland

Cited by 4 publications

References 3 publications

Silica Microphorms in Soils Affected by Hydrothermal Activity on the Yellowstone Volcanic Plateau, USA

Silica Microphorms in Soils Affected by Hydrothermal Activity on the Yellowstone Volcanic Plateau, USA

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Effect of humic substances and clay minerals on the hydrosorption capacity of clay particles in meadow soils (Middle Priamurje, Far East of Russia)

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