Интерпретация результатов гранулометрического анализа почвы в разных школах почвоведения

Abstract

The article discusses a few of today's applicable soil classifications in terms of their texture: the one by A. Kachinsky (Russians) and other two – by the US Department of Agriculture (USDA) and the World Reference Base for Soil Resources (WRB). The article also presents several discrepancies in the nature of the source of research (primary soil particles), the width of the borders of the key textural classes, and also in the need to take into account possible ways of their formation when classifying. Bearing it in mind, we have studied 57 separate soil samples of the Calcic Chernozem of the Rostov Region. The comparative study of the results of the particle-size distribution analysis was performed based on the results obtained with the help of the laser diffraction method, since it is not directly related to any of the above classifications, thus being free from whatever lasting stereotypes. The choice of options for the conditions of soil formation as presented in the Russian classification seems a key decisive parameter while interpreting experimental results. In the example under consideration, this classification allows for defining the variety of a textural class as clay (from light to heavy) depending on what type of soil formation the sample may be related to. Due to some discrepancies in determining the boundaries of the textural classes, we have observed redistribution of primary soil particles whereas their factual amount remains unchanged. All these differences are vital nowadays in view of globalization and boost in the number and importance of international research.