Few branches of the biological sciences have developed to such an extent
as has ecology in the recent decades. The successful development of this
science is directly related to need to create a sound scientific basis
by which we can control our diminishing natural resources and integrate
this with the control of biological systems of the component species.
Studies on the bioenergetics of ecosystems, as well as on the home-
ostatic mechanisms functioning at the populations and biocenoses levels
are of great importance in this respect. The results of these studies
are very significant in forestry management which deals with multiannual
tree communities - forest stands. It is particularly important in this
of the necessity for the possible respect for economic planning, in view
prolonged maintenance of forest biocenoses as stable systems. Neither in
the present nor in the immediate future can be protection of forest
ecosystems consisting of natural plant and animal communities be
achieved by the cultivation of resistant forms or the intensification of
chemical intervention.