POST-PYROGENIC CHANGES IN THE CHEMICAL COMPOSITION OF SOILS OF AGRO-FORESTRY IMPROVEMENT PLANTATIONS OF THE VOLGOGRAD REGION

Danchenko Ivan А.  -  laboratory assistant-researcher of the Laboratory for forecasting the bio-productivity of Agroforestry Landscapes, Federal State Budgetary Scientific Institution “Federal Scientific Center for Agroecology, Integrated Reclamation and Protective Forestry of the Russian Academy of Sciences” (FSC Agroecology RAS), 400062, Russia, Volgograd, Universitetsky Prospekt, 97, danchenko-i@vfanc.ru

Yakovleva Lyudmila V.  -  D. Sc. (Biology), Associate Professor, Head of the Department of biotechnology, aquaculture, soil science and land management, Astrakhan State University named by V.N. Tatischev, Russia, 414000, Astrakhan, Shaumyana Str., 1, yakovleva_lyudmi@mail.ru

Zotov Egor Sergeevich  -  laboratory assistant-researcher of the Laboratory for forecasting the bio-productivity of Agroforestry Landscapes, Federal State Budgetary Scientific Institution “Federal Scientific Center for Agroecology, Integrated Reclamation and Protective Forestry of the Russian Academy of Sciences” (FSC Agroecology RAS), 400062, Russia, Volgograd, Universitetsky Prospekt, 97,

The article is devoted to the study of post-pyrogenic changes in the chemical The article is devoted to the study of post-pyrogenic changes in the chemical composition of chestnut soils of agroforestry plantations in the Volgograd region. The results of the study showed significant changes in the content of total and mineral nitrogen, humus, mobile phosphorus and potassium as a result of fire, which affects ecosystem processes and soil fertility. Losses of organic matter during fires are associated with thermal decomposition of humus. The content of total and mineral nitrogen in areas exposed to fire was lower compared to control areas. A decrease in the content of all forms of nitrogen in the soil after a fire can lead to its deficiency for plants, which limits their growth and productivity at the initial stages of restoration. The data obtained can be useful for developing recommendations for the restoration and improvement of soil resources in agroforestry conditions.

Key words: soil pyrogenesis, chestnut soils, Volgograd region, agroforestry reclamation, soil chemical composition, pH, humus, mobile phosphorus, mobile potassium.