esoilБюллетень Почвенного института имени В.В. ДокучаеваDokuchaev Soil Bulletin0136-16942312-4202V.V. Dokuchaev Soil Science Institute10.19047/0136-1694-2023-117-208-231esoil-775Research ArticleСтатьиНеоднородность свойств порового пространства гумусового горизонта темно-серой почвы в масштабе педонаHeterogeneity of pore space properties at the pedon scale of the Phaeozems humus horizonhttps://orcid.org/0000-0003-3733-0284ФоминД. С.FominD. S.

119017, Москва, Пыжевский пер, 7, стр. 2

7 Bld. 2 Pyzhevskiy per., Moscow 119017

fomin_ds@esoil.ruhttps://orcid.org/0000-0003-2453-3090ЮдинаА. В.YudinaA. V.

119017, Москва, Пыжевский пер, 7, стр. 2

7 Bld. 2 Pyzhevskiy per., Moscow 119017

yudina_av@esoil.ruhttps://orcid.org/0000-0003-0016-5019РоманенкоК. А.RomanenkoK. A.

119017, Москва, Пыжевский пер, 7, стр. 2

7 Bld. 2 Pyzhevskiy per., Moscow 119017

ФИЦ "Почвенный институт им. В.В. Докучаева"РоссияFederal Research Centre “V.V. Dokuchaev Soil Science Institute”Russian Federation2023151220230117208231Copyright © Фомин Д.С., Юдина А.В., Романенко К.А., 20232023Фомин Д.С., Юдина А.В., Романенко К.А.Fomin D.S., Yudina A.V., Romanenko K.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://bulletin.esoil.ru/jour/article/view/775

Вариабельность параметров почвы зависит от выбранного метода измерений, генезиса и типа землепользования почвы, а также уровня иерархии структурной организации почвы. Компьютерная томография почв – активно развивающийся метод изучения структуры почвы, для которого остаются актуальным многие методические вопросы. Цель данной работы – изучить вариабельность основных параметров порового пространства (общей пористости, количества и среднего размера пор) на примере гумусового горизонта серой лесной почвы. Для этого было отобрано избыточное количество микромонолитов в количестве 15 штук (объемом 2 × 3 см). На основе статистической оценки варьирования параметров была поставлена задача определить оптимальное количество повторностей, позволяющее полноценно охарактеризовать микроструктуру порового пространства почвы в масштабе педона. Наименьшая разница неоднородности между педоном и репрезентативным элементарным объемом REV наблюдается для общей пористости (~12 раз), в то время как для количества и среднего размера пор это соотношение больше (~14 раз). В среднем уровень порога, при котором дисперсия свойств прекращала снижаться, для общей пористости равняется 7.3 ± 0.6 шт., для количества пор – 6.5 ± 0.6 шт., для среднего размера пор – 7.5 ± 0.4 шт. Таким образом, минимальное количество повторностей, необходимое для полной характеристики порового пространства исследованной почвы, составило 7 шт. Отбор и анализ микромонолитов в 3-кратной повторности позволили описать неоднородность структуры верхнего горизонта педона только на 25–30%.  

The variability of soil parameters depends on the chosen method of measurements, the genesis and type of soil land use, and the level of hierarchy of soil structure organization. Computed tomography of soils is an actively growing method of soil structure study, for which many methodological issues remain relevant. The aim of this work was to examine the variability of the main parameters of the pore space (total porosity, number and average pore size) by the example of the humic horizon of a Phaeozem soil. For this purpose, an excessive number (15 microcores of 2 × 3 cm volume) was sampled from soil profile. Based on statistical evaluation of parameter variation, the objective was to determine the optimal number of replicates allowing full characterization of the soil pore space microstructure at the pedon scale. The smallest difference in heterogeneity between pedon and representative elementary volume REV was observed for total porosity (~12 times), while this ratio is larger (~14 times) for number and average pore size. On average, the threshold level, at which the dispersion of properties stopped decreasing, was 7.3 ± 0.6 monoliths for total porosity, 6.5 ± 0.6 monoliths for pore number, and 7.5 ± 0.4 monoliths for LT. Thus, minimal number of replicates necessary for full characteristic of soil structure is 7 monoliths. Sampling and analysis of microcores in 3 repetitions allows to describe the heterogeneity of the structure of the upper pedon horizon only by 25–30%.

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The authors declare that there are no conflicts of interest present.