PATTERNS OF CHANGES IN THE SPATIAL STRUCTURE OF AGROCHEMICAL PROPERTIES OF ARABLE LIGHT GRAY FOREST SOIL DURING LONG-TERM OBSERVATIONS

DOI 10.12737/2073-0462-2025-41-49 УДК 631.4

Authors

  • Ilnaz Alimovich Sakhabiev Institute of Ecology, Biotechnology and Nature Management of Kazan (Volga Region) Federal University, Kazan, Russia
  • Liliya Gabdulbarovna Gaffarova Kazan State Agrarian University, Kazan, Russia
  • Kamil Gashikovich Giniyatullin Institute of Ecology, Biotechnology and Nature Management of Kazan (Volga region) Federal University, Kazan, Russia.
  • Elena Smirnova Institute of Ecology, Biotechnology and Nature Management of Kazan (Volga region) Federal University, Kazan, Russia.

Keywords:

agrochemical properties of soils, spatiotemporal heterogeneity, variogram analysis, geostatistical analysis, long-term data, soil fertility.

Abstract

The studies were conducted to assess changes in the spatial structure of mobile forms of nitrogen, phosphorus and potassium in the arable layer of light gray forest soil in the Republic of Tatarstan from 1965 to 2021. Long-term data from agrochemical surveys were processed using the method of geostatistical variogram analysis, reflecting changes in the variance of indicators with distance. Over the course of almost 60 years, there has been a noticeable change not only in the content of mobile forms of nutrients, but also in their spatial structure. The autocorrelation ranges (the distance of maximum similarity of the indicator in space) of mobile phosphorus in 1965 and 1975 were 185 and 205 m, respectively. By 1980, the value of this indicator increased to 459 m, and in 2011 it reached a maximum (778 m). The autocorrelation range of mobile potassium increased from 213 m (1965) to 439 m (2021), hydrolyzable nitrogen - from 266 m (1975) to 550 m (2021). Variagrams of hydrolyzable nitrogen in 1987 and 2011 indicate a regular change in space (spatial trend). The ratio of variogram elements (nugget/sill), which is used to estimate the spatial dependence of the indicator (the mutual influence of the indicator based on its location in space), made it possible to conduct a comparative analysis of the spatial structure of the studied properties over time. For hydrolyzable nitrogen, the spatial dependence was moderate from 1975 to 1980 (nugget/sill within 25...75%), and strong from 1987 to 2011 (nugget/sill<25%). For mobile phosphorus, it was predominantly strong, with the exception of 1975 (moderate), and for mobile potassium - weak in 1975 (>75%), and moderate in 1965, 1980 and 1987. Compared to hydrolyzable nitrogen, mobile forms of phosphorus and potassium are characterized by a more stable spatial structure, but a tendency to increase the autocorrelation range is noted.

Information about the authors

Ilnaz Alimovich Sakhabiev , Institute of Ecology, Biotechnology and Nature Management of Kazan (Volga Region) Federal University, Kazan, Russia

Ph.D. of Biological Sciences, Associate Professor of Soil Science Department named after I.V. Tyurin

Liliya Gabdulbarovna Gaffarova , Kazan State Agrarian University, Kazan, Russia

Gaffarova Liliya Gabdulbarovna – Ph.D. of Biological Sciences, Associate Professor of Agrochemistry and Soil Science
Department, e-mail: gaffarovalylya@mail.ru
Kazan State Agrarian University, Kazan, Russia

Kamil Gashikovich Giniyatullin , Institute of Ecology, Biotechnology and Nature Management of Kazan (Volga region) Federal University, Kazan, Russia.

Giniyatullin Kamil Gashikovich – Ph.D. of Biological Sciences, Associate Professor of Soil Science Department named
after I.V. Tyurin, e-mail: ginijatullin@mail.ru

Elena Smirnova , Institute of Ecology, Biotechnology and Nature Management of Kazan (Volga region) Federal University, Kazan, Russia.

Smirnova Elena Vasilevna – Ph.D. of Biological Sciences, Associate Professor, Head of Soil Science Department
named after I.V. Tyurin, e-mail: elenavsmirnova@mail.ru
Institute of Ecology, Biotechnology and Nature Management of Kazan (Volga region) Federal University, Kazan, Russia.

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Published

2026-07-21

How to Cite

Sakhabiev И. А., Gaffarova Л. Г., Giniyatullin К. Г., & Smirnova Е. В. (2026). PATTERNS OF CHANGES IN THE SPATIAL STRUCTURE OF AGROCHEMICAL PROPERTIES OF ARABLE LIGHT GRAY FOREST SOIL DURING LONG-TERM OBSERVATIONS : DOI 10.12737/2073-0462-2025-41-49 УДК 631.4. Vestnik of Kazan State Agrarian University, 20(2). Retrieved from https://www.vestnik-kazgau.ru/index.php/vestnik/article/view/81

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