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Том 71, № 4-5 (2016)
- Год: 2016
- Статей: 7
- URL: https://journal-vniispk.ru/0147-6874/issue/view/10676
Genesis and Geography of Soils
Conversion of Munsell color coordinates to Cie-L*a*b* system: Tables and calculation examples
Аннотация
The widely used Munsell optical system is unsuitable for the statistical treatment of data for assessing the role of pigments in soil color. The CIE-L*a*b* system is more efficient for this purpose. This article contains a table for converting data on soil color from one scale to the other based on the example of oxisols (Brazil) and pale (Yakutia) and alluvial (Spain) soils. The advantages of the CIE-L*a*b* system for characterizing soil color have been shown.
139-146
Bayesian approach in agrochemical surveys
Аннотация
In the scheme of agrochemical surveys, sampling is one of the most costly stages. The use of a priori information about the distributions of properties (Bayesian approach) allows one to reduce the number of samples to be taken by 5–10% without deteriorating the accuracy of the estimation. The maintenance of regional soil-mapping databases is a necessary condition for applying the Bayesian approach.
147-152
Spatial distribution of exchangeable bases in chernozem of Kamennaya Steppe
Аннотация
The high degree of base saturation and high cation exchange capacity with an appreciable dominance of calcium are related to the high carbonate content in parent rocks, high content of humus in chernozems, and abundant fine material in their profiles. These are characteristic features of prevalent soils in the Kamennaya Steppe. Almost all soils of monitoring and experimental plots have an appreciable spatial variation in exchangeable bases. The obtained data indicate that the content of adsorbed calcium in the exchangeable complex of the soil decreases with increasing shares of adsorbed magnesium and partially sodium.
153-156
Effect of long-term drainage on the content and composition of humus in soddy-podzolic soils and their particle-size fractions
Аннотация
Changes in the quantitative and qualitative characteristics of humic substances in soddy-podzolic soils and their particle-size fractions in the course of long-term drainage have been studied under the conditions of pronounced microrelief and different intensities of agrotechnical impacts. The transformation features of humic substances during the periods of specific impacts have been characterized.
157-164
Soil Physics
Possibilities of using the Landau–Deryagin law to evaluate soil degradation as a result of its contamination with chlorides
Аннотация
The contamination of heavy loamy chernozem by iron, sodium, magnesium, calcium, and hydrogen chlorides (2% of soil mass) decreases soil moisture content (W, percent of soil mass) in the interval of the soil moisture pressure (Р) from 0.0 to–0.6 atm, which indicate soil degradation. In a range of P from–0.2 to–0.6 atm, there is a close correlation between the logarithm of Р module (log|P|) and W and, therefore, a regression relationship log|PW| = |P0|–kW, where |P0| and k are empirically determined parameters. This relationship is similar to the Landau–Deryagin law. The parameters |P0| and k are also in a close correlation, which is described by the regression equation |P0| = 29.3k–0.557. At chernozem contamination by chlorides, the |P0| and k parameters become smaller, and so they may be used for the evaluation of degradation of chloride-contaminated soils.
165-170
Soil Biology
Absolute number of Bacteria and Archaea in soil
Аннотация
The possibility of using the method of exhaustion (removal sampling) applied to determine the absolute number of Bacteria and Archaea populations in soil based on accounting data for quantitative fluorescence in situ hybridization has been shown.
171-173
Ecological and taxonomic features of actinomycetes complex of the soils of the Lake Elton region
Аннотация
Ecological and taxonomic characteristics of the actinomycete complex of solonchak soils and light chestnut soils in the Lake Elton region have been presented. Data on the abundance and taxonomic structure have confirmed the ecological importance of actinomycetes in soils with evident signs of salinity.
174-177