Indices of econiche overlapping were determined as a result of studies
of actinomycete successions in chernozem. Conditions for the isolatio
n of actinomycetes belonging to particular taxa were found. Ecological
niches of the species belonging to the series Violaceus and Aureus of
the section Cinereus were the closest, and ecological niches of Ciner
eus Achromogenes and Cinereus Chromogenes were the most separated, The
latest stages of succession (days 36 - 62 of the experiment) were fav
orable for most actinomycete species.