Parametric estimation of soil physical functions

Шеин, Е. В.; Rusanov, A. M.; Nikolaeva, E. I.; Хайдапова, Д. Д.

doi:10.3103/s0147687407020093

Cited by 11 publications

(14 citation statements)

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“…It could occur as a result of microbial cells inhabiting micro volumes and, therefore, heterophase systems such as soil. They exist in the conditions of high water-soluble compound concentrations [11], where, in its turn, all soluble molecules are concentrated as a result of colloid interactions [100]. Previous studies of pure bacterial cultures isolated from desert soils showed the presence of several halotolerant strains, which were able to grow at extreme values of the environmental salinity [19],[23],[101].…”

Section: Discussionmentioning

confidence: 99%

Soil bacterial communities of Sahara and Gibson deserts: Physiological and taxonomical characteristics

Belov¹,

Cheptsov²,

Vorobyova

2018

AIMS Microbiology

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The purpose of this research was to investigate the structure of soil bacteria communities present in the Gibson (Australia) and the Sahara (Egypt) deserts, as well as to estimate strain survivability under different environmental factors. It should be noticed that the screening of bacterial resistance to wide spectra of principally different stress conditions was performed for the first time. Experiments were conducted with culturable bacterial communities. Strains were identified using 16S rRNA sequencing, and stress-tolerance was estimated by growing strains in various nutrient media. In order to characterize the community the epifluorescent microscopy and multisubstrate testing were also performed. High bacterial abundance in the desert soils was detected, and there was seen a significant proportion of culturable cells. The close numbers of psychotropic and mesophilic bacteria in arid ecosystems were revealed. The representatives of the Actinobacteria phylum were dominant in the microbial communities, and Firmicutes , Proteobacteria , and Bacteroidetes phyla representatives were also identified. Tolerance of the axenic bacterial cultures, isolated from arid desert ecotopes, to temperature, pH, salts (KCl, NaCl, MgSO 4 , NaHCO 3 ), strong oxidizers (Mg(ClO 4 ) 2 ), and antibiotics (ampicillin, cephalexin, chloramphenicol, tetracycline, doxycycline, kanamycin, rifampicin) was studied. The bacterial isolates were characterized by polyextremotolerance and by the ability to maintain metabolic activity in vitro while influenced by a wide range of physicochemical and biotic factors.

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Section: Discussionmentioning

confidence: 99%

Soil bacterial communities of Sahara and Gibson deserts: Physiological and taxonomical characteristics

Belov¹,

Cheptsov²,

Vorobyova

2018

AIMS Microbiology

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“…The higher the dispersity factor, the less stable the soil microstructure. In well-structured soils, the dispersity factor is 3-5, in medium-structured soils it is 6-10, and in weakly structured soils it is 11-15, in structureless soils it can increase to 50 and even 80 [11].…”

Section: Methodsmentioning

confidence: 99%

“…To determine the severity of the primary structure formation of gray forest soils, the results of granulometric and microaggregate analysis made by N.A. Kachinsky were used [11]. The soil sample was prepared for granulometric analysis by vigorously grinding the sample with a rubber-tipped pestle in a porcelain mortar with the addition of sodium pyrophosphate solution, followed by boiling in a flask.…”

Section: Methodsmentioning

confidence: 99%

Microaggregate Composition as a Factor of Variability in the Physical Properties of Gray Forest Soils in Western Siberia

Kayugina

Eremin

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The aim of the study was to study the variability of the microaggregate composition of the soil profile of virgin gray forest soils in the western part of the West Siberian Lowland. 330 soil sections were studied, covering all subtypes of gray forest soils. Empirical data were processed using mathematical methods of variation statistics. The results of the research showed that the humus horizon of light gray forest soils is characterized by good water resistance of microaggregates - the dispersity factor on average for the sample is 14.6%, the variation is small (Cv = 19%). Gray forest soils in the humus horizon have, on average, a dispersity factor of 12.2%. This subtype, in comparison with light gray soils, has a higher variability of the dispersity factor (Cv = 24%), which is due to the variety of combinations of soil formation factors, mainly relief and vegetation. The dispersity factor of the humus horizon of dark gray forest soils averages 7.9% for the sample, which is typical for medium structured soils; the variation is estimated as small (Cv = 18%). The microaggregate composition of gray forest soils is characterized as satisfactory throughout the entire soil profile, which makes it possible to improve structure formation during agricultural development and maintain the optimal structural-aggregate composition for a long time. The results obtained can be used in the development of an adaptive-landscape system of agriculture.

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“…Ca is small and may be neglected [1]. The organic component in the peat soil prevails the mineral ones [21]. The solid matter was composed only by organic matter and N=1, at a first approximation, hence:…”

Section: Peat Densitymentioning

confidence: 99%

“…Heat capacity per volume, cal/(K•cm 3 ) Soil minerals Organic matter de Vries [23] 0.46 0.60 Voronin [20] 0.50 0.64 Shein [21] 0.48 0.60 Average value 0.48 0.61…”

Section: Authormentioning

confidence: 99%

On a question of non-constant thermal diffusivity of soils

Glagolev

Dyukarev

Terentieva

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The general heat conductivity equation includes time- and depth-dependent soil properties (soil heat capacity and thermal conductivity). The simplified form of the heat conductivity equation contains only the soil thermal diffusivity parameter. Numerical solutions of the general and simplified equations were compared to quantify the possibility of equation reduction. Two test runs for soils with different compositions were done. The thermal regime for both peat soil and dark chestnut soil does not change significantly after using a simplified heat equation according to model estimations. The maximal soil temperature discrepancy was about 0.5 °C for peat soil and 2.2-3.3 °C for dark chestnut soil, which results in 4-6% error in methane efflux estimations.

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Parametric estimation of soil physical functions

Cited by 11 publications

References 0 publications

Soil bacterial communities of Sahara and Gibson deserts: Physiological and taxonomical characteristics

Soil bacterial communities of Sahara and Gibson deserts: Physiological and taxonomical characteristics

Microaggregate Composition as a Factor of Variability in the Physical Properties of Gray Forest Soils in Western Siberia

On a question of non-constant thermal diffusivity of soils

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