Studies on the composition of rhizosphere microbiocenoses of sea buckthorn growing in ecosystems of Almaty oblast

Abstract

Microbiocenosis composition of the sea buckthorn rhizosphere zone from various ecosystems of Almaty oblast was examined. Studies have shown that the sea buckthorn rhizosphere is inhabited with diverse ecological and trophic groups of microorganisms, among which the dominant position is occupied by hemoorganotrophs - 1.2*10⁷-1.3*10⁸ CFU / g of soil, actinomycetes - 1.5-7.7-10⁵ CFU/g of soil, and oligotrophs - 6.7*10⁵ -3.0*10⁶ CFU / g of soil. In the rhizosphere of sea buckthorn of all investigated soil types, an increase in diversity of the qualitative composition of actinomycetes was observed, which manifested itself primarily through appearance of the colored forms of actinomycetes of the Violaceus, Ruber and Coerulescens series.

Because sea buckthorn forms a symbiotic relationship with nitrogen-fixing bacteria of the genus Frankia and enriches the soil with nitrogen, it was important to establish the quantitative presence of free nitrogen-fixing bacteria in the rhizosphere and its control soil samples. In the rhizosphere buckthorn number of nitrogen-fixing Azotobacter genus of microorganisms is 20-80%, in the control samples - 8-50%.