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Summary: During the research period 166 stands has been selected and
65 management programmes for seed stands are worked out. It has been
stated in the experiments that the application of the corresponding
substrata, mineral fertilizers and pesticides and cultivation of plants in
plastic houses can considerably reduce the production cycle of seedlings
and improve their quality. Detailed pedological, sylvicultural and
plant-nutritional researches for the establishment of new cultures have
been carried out on 550 ha. Categorization of forest soils was carried
out in Podravina, Varaždin region. Research results have shown that the
appropriate choice of tree species, methods of establishment, spacing and
the application of regular silvicultural and control measures can
significantly influence the growth of cultures. Better results were
achieved in experiments with local provenances of common oak and with
domestic provenances of Norway spruce and Scotch pine results are poorer.
Within the framework of the EU an international experiment comprising 49
Beech provenances, has been established. Among foreign provenances,
Sudetic larch, Douglas fir from Washington state and Eastern White pine
from Croatia are the best. Research results indicate to intensive soil
desiccation in lowland forests of Pokuplje and Posavina. In Varoški Lug
and Turopoljski Lug dieback of Pedunculate Oak has been caused primarily
by the lack of moisture in the soil as a consequence of drainage canals
and several arid years. Considerable increase of sulphur in assimilation
organs of forest trees has been determined in the surrounding of SO2
sources (Plomin, Rijeka-Bakar, Zagreb). Further away from SO2 sources,
particularly in regions of northern and western Croatia, imission soil
acidification and significant introduction of lead and other heavy metals
into forest soils on many locations was found. Partyculary high quantities
of heavy metals are introduced into soils of lowland forests by polluted
flood waters. Seed quality and nutritional state have been deteriorating
in direct proportion with tree-crown damage in the Fir and Spruce.
Defoliators often cause leaf area reduction.
Keywords: seed, forest cultures, provenances, pollution, water regime, intergrated pest control
Research goals: -Choise, selection and management of seed stands,
-New methods for controling seed quality, -New methods for seedlings
production, -Finding of appropriate substratum and mineral nutrients
applications, -Weed, plant disease and pest control in forest nurseries,
-Methods forest cultures establishment, -Finding the most favourable
species and provenances of domestic and foregin tree species,
-Investigating the basic genetic properties of the Beech in Europe,
-Selection of sites for forest cultures establishment, -Categorization of
alluvial soils for reforestation of damaged stands, -Impact of density on
biomass production, -Determination of the relation of tree-crown damage of
Fir and Spruce, state of nutrition and seed quality, -Impact of
underground and surface waters regime, pollutants and biotic factors on
the forest ecosystem stability and finding measures for the prevention of
forest decline.
COOPERATION - INSTITUTIONS
Name of institution
: Šumarski fakultet Sveučilišta u Zagrebu Type of institution: University/Faculty Type of cooperation: Systematic exchange of information City: 10000 - Zagreb, Croatia
Name of institution
: "Hrvatske šume", Javno poduzeće za
gospodarenje šumama i šumskim zemljištima R. Hrvatske Type of institution: Economical/Production Type of cooperation: Systematic exchange of information City: 10000 - Zagreb, Croatia
OTHER ACHIEVEMENTS
Name
: Mediteranean Forest Trees - A Guide for Crown Assessment Type of achievement: Other Authors: Mediterranean Experts Group (Komlenović, N., etc)
CEC-UN/ECE
Name
: Forest Condition in Europe Results of 1993. Survey Type of achievement: Other Authors: CEC-UN/ECE (Komlenović, N.) Other information about the project.