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Evaluation of the response of a boreal forest ecosystem to climatic changes

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The physical and chemical environment of forests will change in the future. How forests will react to this situation is not yet known. Structures and functions of plant and animal communities can change drastically so that new ecosystems will evolve. One of the main properties influencing their succession of ecosystems is the carbon-water use efficiency. A natural forest ecosystem at the boreal-nemoral boundary in the Central Biosphere Forest Reserve in Russia is quite sensitive to changing environmental conditions.

Biological and physical processes determining the carbon and water fluxes in the atmosphere-tree-soil system will be investigated experimentally and theoretically in order to evaluate the competition strength of tree stands and their understorey. In the field, H20 and CO2 fluxes above and under the forest canopy will be measured to estimate CO2 fixation and mathematical modelling of these processes will help to generalise and regionalise these features.

This project contributes to international environmental research programmes, namely Global Change and Terrestrial Ecosystems (GCTE), Biological Aspects of the Hydrological Cycle (BAHC), Boreal Forest (BOREAS) and Northern Hemisphere Climate Processes Land Surface Experiment (NOPEX). The expertise of different research groups in Europe will be combined to get a broad understanding of the interaction of forests and climate and how forest ecosystems can change as a result of a climate change.

Experimental results in the forest reserve will better characterise the factors influencing the water vapour and carbon dioxide fluxes between the boreal forest in the Central Forest Biosphere Reserve on the boreal-nemoral border in Russia and the atmosphere.

The empirical information obtained will be: on a twig level, CO2-uptake rates as a function of: solar radiation, water status, and needle temperature; on a tree level, leaves area index, and shoot and root distribution; on a stand level, stomatal conductance, real evapo-transpiration, and net CO2 transfer rate.

The mathematical model of a three-dimensional forest will integrate field measurements and conceptual ideas to specify and quantify radiation input, stand architecture, energy distribution in the forest, and C-balance of a forest, all as a function of climate conditions (radiation, temperature and precipitation). The reaction of the C-balance on changes of climatic conditions will indicate the trend in which this boreal forest will develop under varying atmospheric conditions.

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Georg-August Universität of Göttingen
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Büsgenweg 1
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Letzte Aktualisierung: 19 September 1996

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Permalink: https://cordis.europa.eu/project/id/INTAS-94-1570/de

European Union, 2024