ИСТИНА

The studies of the influence of agrogenesis and anthropogenesis on physical and physicochemical properties of soils experience a notable shift. Apart from traditional approaches to assessing bulk soil properties, the new information level requires to determine soil fractions and aggregate structures including the changes at meso- and microaggregate levels. Photoacoustic spectroscopy is a sensitive modality of absorption spectroscopy. It is based on the measurements of the heat caused by the absorption of radiation by the sample. The pressure waves resulted from heating the sample by IR or visible light are detected by a microphone or a piezo-transducer providing high sensitivity of light-absorption measurements. FTIR PAS has features like depth profiling, simple and almost nondestructive sample preparation, and small amounts of the test sample. The aim of this study is to work out the approaches for the identification and assessment of inorganic and organic-matter components of bulk samples and size fractions (by dry sieving) of chernozems and sod-podzolic soils as SiO2-based soils with different type of land use by FTIR-PAS.