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ŠUMARSKI LIST 7-8/1986 str. 99     <-- 99 -->        PDF

Prof. Dr. Branimir Prpić

Ecology of the Forest

The ecology of the forest is a specialist and scientific field which has to be
considered during the initial development of forestry practice and science. Very
important developments have been made in this field during the last 50 years,
both here in Yugoslavia, and all over the world. The problem of the selection
of tree species, stability of forest eco-systems, importance of general functions
of the forest, and, at the same time, a need for incressing production of wood
for technological and energy uses, requires more and more intensive research
into the ecology of the forest — especially the relationship between the population
and the forest community. As forests become every day a condition of qualitative
human life, the ecology of the forest relates more closely to human ecology.

The phenomenon of forests dying due to industrial and air pollution makes
the ecology of the forest the focal point of social interest. Many kinds of trees
are in danger, as well as whole forestry regions. Another problem occurs when
rivers are diverted in order to build hydra-electric power plants, and as a result
the water flow in those areas is altered. These changes have seriously endangered
forests an the valleys of the Sava and Drava rivers in the Socialist Republic of
Croatia. Because of the aforementioned situations which disturb the forest´s eco-
systems, research of the forest´s ecology is obliged to find solutions which will
guarantee the survival of the folrest, and maintain its various functions.

Besides dealing with depleting forests in normal conditions, the ecology of
the forest has to cope with changes in the »chemical climate« and water flows
which cause the death of some trees, groups of trees, and even whole communities
of cultivated trees: common oak (Quercus pedunculata Ehrh.), sessile-
flowered oak (Qu. sessiliflora Salisb.), common elm (Ulmus minor Mill.), narrow-
leaved ash), (Fraxinus angustifolia ssp. pannonica Fuk -Soo et Simon), beech
(Fagus sylvatica L.), silver basswood (Tilia tomentosa Moench.), silver fir (Abies
alba Mill.), and common spruce (Picea abies Karsten).

The ecology of the forest uses natural forest (virgin forest) as the model to
attain stability of forest componets in multi-purpoSe forests.

Dr. Nikola Komlenović

Physiology and Nutrition of Forest Trees and Ecophysiology

At the end of the last century, in the Šumarski list, one could read of the
importance of leaf litter for chemical and physical properties and forest tree
nutrition, and the potential damage inflicted on fotrests by the continued gathering
of litter. The authors base their discourses on the results of investigations
carried out in other countries. In the period between the two world wars, the
studies of mineral nutrition of forest trees were included in the scope of pedological
investigations. During the pdlst-war period, a fair amount of attention was