Physical-Tomographic Characteristics and Structure of Bacterial Community of the Agrophysical System “Germinating Roots—Pore Space of Soils” (Physical Model Experiment

Suzdaleva, A.V.; Verkhovtseva, N.V.; Abrosimov, K.N.; Romanycheva, A.A.

Авторы: Suzdaleva A.V., Verkhovtseva N.V., Abrosimov K.N., Romanycheva A.A.
Журнал: Eurasian Soil Science
Том: 54
Номер: 9
Год издания: 2021
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 1410
Последняя страница: 1417
Оригинальные версии: Физико-томографическая и микробиологическая характеристика агрофизической системы «прорастающие корни – поровое пространство» почв (модельные физические экспериментальные исследования)
DOI: 10.1134/S1064229321090118
Аннотация: Abstract—Computed tomography allows quantifying the volume of elements of soil solids, pore space, androot system. It was possible to record the dynamics of changes in the soil pore volume space within the framework of a special physical model experiment with cultivation of barley seedlings for 7 days and tomographicimaging at key stages. The main goal was to quantify the structural changes in the development of root systemand their dynamics. The experiment has been carried out in the samples of soddy-podzolic soil and chernozems; along with changes in the soil structure, changes in the structure of the microbial community have beenrecorded in the agrophysical system “germinating roots–pore space.” Models of the seedbed were created inplastic buckets with a volume of 3 cm3 with two layers: the subseminal layer compacted to 1.2 g/cm3 and theabove-seed aggregated layer with a density of 0.7–0.8 g/cm3. Seeds of barley (Hordeum vulgare L.) of theMikhailovskii variety were placed on the boundary of these layers. Soil water content was maintained close tothe field capacity. As germination progressed from 3 to 7 days, a tomographic survey and a study of the microbiological community were carried out by gas chromatography-mass spectrometry. During this period, adecrease in the tomographic porosity in the subseminal layer and a change in the number of microorganisms,that mainly perform the destruction of complex carbon compounds, were recorded. Tomographic and microbiological studies have shown the interconnections between the processes occurring during seed germinationand can be used to quantify the emerging root system.Keywords: Albic Glossic Retisol (Loamic, Cutanic), Calcic Chernozem, soil pore space structure, X-raycomputed tomography, non-invasive imaging, structure of the microbial communityDOI: 10.1134/S1064229321090118INTRODUCTIONThe structure of pore space around the roots is ofgreat importance for plant growth and development,supply with nutrients, and formation of soil hydrophysical properties, gas permeability, and environment for microorganisms [6, 20]. Plant demands forsoil conditions can be expressed by such physicalparameters as density, volume distribution of pores bytheir diameters, and the ratio between water and airwithin pores. It is known that plants develop well insoils with bulk density ranging from 1.15 to 1.45 g/cm3and porosity in the range from 45 to 50% [1]. However, it was noted that root hairs increase the aggregation of soil [11] and are closely related to the rhizosphereformation [7]. The structure of pore space can alsocontrol the biodiversity of microbial community. Particularly, such parameter as pore connectivity was suggested as explanation of biodiversity of microorganisms in soil [6]. It was reported that aggregates withgreater area of surface and higher porosity were mostfavorable for the development of microbiota [18].The focus of this work was to study the process of
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Physical-Tomographic Characteristics and Structure of Bacterial Community of the Agrophysical System “Germinating Roots—Pore Space of Soils” (Physical Model Experimentстатья

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