Microbiocenosis characteristics of agrogenically altered acid brown forest soils in humid subtropics of Russia

Elena Rogozhina,Lyudmila Malyukova,E Egorov,E Yakimenko,N Zaporozhets,I Ilina

doi:10.1051/bioconf/20213405002

Abstract

Under conditions of perennial cropping of industrial tea crop on acidic brown forest soils of the Black Sea coast of Russia, the following were investigated: number of bacteria, of actinomycetes (mainly the Streptomyces genus) and of micromycetes (saccharomycetes), seasonal dynamics and functional activity of the microbial complex during period of 2008-2019. Stationary experiments were launched in various backgrounds of mineral fertilizer application. The experiment was accompanied by the use of generally accepted recommended techniques for microbiological studies. As follows from the analysis of the data obtained, it was established that the long treatment period of mineral fertilizers at doses from N200P60K50 to N600P180K150 in given soil-climatic conditions under the tea crop contributed to significant decrease in the number of actinomycetes and nitrogen fixing bacteria of the Beijerinckia genus vs. the control variant (without fertilizers). The most significant decrease in the number of micromycetes was revealed immediately after the application of mineral fertilizers at a dose of N600P180K150. After 2 months, the number of this group of soil microorganisms was built back. Under the impact of both medium and high doses of mineral fertilizers, the functional activity decrease of soils (CO2 emission and potential nitrogen fixation activity) was noted.

Highlights

The Black Sea coast of Russia has unique soil-climatic conditions for the industrial tea crop, the modern intensive cropping technology of which is associated with the regular application of mineral fertilizers into the soil
Importance assessing of the "soil health" for the resort zone [3,4,5] and the strategic plan formation for post-agrogenic rehabilitation, the tasks associated with the development of new approach to technologies of turnover regulation of biogenic elements in
The scientific search segment associated with the allocation and analysis of the composition and structure of the microbiocenosis of agrogenically altered acid brown forest soils of the subtropical zone has not been fully learned

Summary

Introduction

The Black Sea coast of Russia has unique soil-climatic conditions for the industrial tea crop, the modern intensive cropping technology of which is associated with the regular application of mineral fertilizers into the soil. Under these conditions, the role of ecological-agrochemical monitoring of soil state, studies of the trend and intensity of biological processes increases. The research trend actuality is confirmed by numerous publications of foreign scientists stating the importance of soil microbial resources for increasing the fertilizer efficiency in the integrated system of soil fertility management of agrocenoses [6,7,8,9,10,11,12]

Methods

Results

Conclusion