Effects of Soil Acidity and Aluminum on the Structure of Microbial Biomass in the Rhizosphere of Barley

摘要

The dynamics of the population and biomass of bacteria, actinomycetal mycelium, mycelium and spores of fungi in the rhizosphere of six barley varieties grown on soddy-podzolic soil were studied using luminescence microscopy. The abundance of eukaryotic microorganisms in the rhizosphere is related to the soil acidity (acid and limed soils) and phase of plant development. The concentration of prokaryotic microorganisms depends on the developmental phase of the plants. The microbial biomass concentration and the rates of colonization of the roots with fungi and actinomycetes were higher in the early variety of barley (Dina) than those in the late barley variety (Duet). Genotype differences were found in the response of different groups of microorganisms to stress in the root zone of the barley varieties, which were contrasting in their sensitivity to the acidity of the soils and concentrations of aluminum ions.