目次

1. Introduction (V. Vancura). 2. Nutrition and energy sources ofmicrobial populations in ecosystems (B. Ulehlova et al.). Soil organic matterand humic substances (F. Kunc). Residues of organisms (B. Ulehlova). Plantmetabolites in soil (V. Vancura). Compounds appearing in the biospherethrough human activity (F. Kunc). 3. Structure of microbial soil associationsand some mechanisms of their autoregulation (D.I. Nikitin, F. Kunc).Structure of microbial soil associations. Trophic groups of microorganisms.Homeostasis in microbial associations and some of its mechanisms. References.4. Microorganisms, their mutual relations and functions in the rhizosphere(V. Vancura). Rhizosphere effect. Colonization of plant roots bymicroorganisms. Metabolites of soil microorganisms. Mutual relations ofmicroorganisms in the rhizosphere. Modifications of the rhizospheremicroflora. References. 5. Mechanisms of adaptation and selection ofmicroorganisms in the soil (F. Kunc, J. Macura). Adaptation and selection ofmicroorganisms in the soil environment: genetic and physiological aspects.Changes in the gnetic outfit of soil microorganisms. Mechanisms controllingthe formation and activity of enzymes in the soil. References. 6. Mutualrelations among microbial processes in soil (F. Kunc). Metabolism ofmicroorganisms and the soil environment. Simultaneous transformations ofadded organic substrates and native soil organic matter. The influence ofother factors on mutual influences of microbial processes in soil.Considerations on the possibilities of controlling soil microbial processes.References. 7. Cycling of mineral elements (B.A. Ulehlova, M. Tesarova).Introduction (B. Ulehlova). Microorganisms and the carbon cycle in ecosystems(M. Tesarova). The nitrogen cycle (B. Ulehlova). Cycling of other mineralelements (B. Ulehlova). Energy flow in grasslands (B. Ulehlova).