SVIBOR - Project code: 4-04-167


Strossmayerov trg 4, HR - 10000 ZAGREB
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SVIBOR - Collecting Data on Projects in Croatia

Project code: 4-04-167


Main researcher: MEDVEDOVIĆ, JURAJ (30253)

Type of research: basic
Duration from: 06/30/92.

Papers on project (total): 27
Institution name: Šumarski institut, Jastrebarsko (24)
Department/Institute: Department of Forest Typology
Address: Streljačka 1
City: 10000 - Zagreb, Croatia

Summary: The energy balance of forest types is established using the analysis of the general climatic conditions in Croatia, the microclimatic circumstances in the individual forest associations, the multitude of plants and their volumes above ground, and the quantity of the humus in the soil. Twelve permanent and a number of tamporary microclimatic stations in different forest associations have been stablished with the objective of determining the strength and impacts of the insolation in the forests of different floral composition and structure. Between 1992 and 1995 it was established that the mean monthly values of the microclimatic elements and amplitudes were essentially different in different forest associations and under different conditions of forest tree crown projections. Within the soil the temperature regime down to 30 cm depth is determined by the floral composition and the temperature regime of the air above the ground, while at greater depths it is determined by the water regime in the soil. A map of pluviothermal indexes of climate suitability for Croatian forest vegetation has been made. Plant heterogenety and volume of the parts above ground in the ground layer of different forest associations have been determined. There has been one invention and a considerable number of reports published in journals and books. The first phase (manuscript) of the energy balance map for different regions of north Croatia has also been made.

Keywords: Energy, forest types, climate favourableness, vegetation, floral composition of forest communities

Research goals: Goals of researches of energy supply of forest types are 1.To determine the quantity of solar energy in particular parts of Croatia, 2.To determine the impact of solar energy on floral composition of forestcommunities and physiological activity of forest trees, 3.To elaborate the map of energy supply of forest types of Croatia according to different climate favourablenesses for forest vegetation. The expected result is a knowledge of vital energy of forest vegetation resulting from climate properties and biological properties of plant species. Since that climate properties result from the available and accepted quantity of solar energy, and vegetation is of climate-zonal character, it means that climate, i.e. insolation is a main ecological factor in the occurrence, development and survival of forest vegetation. The quantity of available and accepted insolacion is in particular parts of Croatia different and, hence, the climate favourableness is also different. If wee determine identical energy supply on regions of identical climate favourablenesses, the climate favourableness indices will be, as expected indicators, if not, we will reach new, also valuable knowledge. That, too, is an aim of research. The contribution of science on research of energy has an application in forest management in such a way that the major ecological factor will show us wheather at some locations we use too little or too much of the forest resourses which can mean either loss or endangering of production possibilities. It is possible that this will be a way of improving the health status of forest stands despite the contamination by traffic and industry.

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Last update: 11/02/95