%0 Article
%T A model for the effect of air pollutants on forest growth.
%A Mäkelä, A.
%A Hari, P.
%A Kellomäki, Seppo
%D 1981
%J Silva Fennica
%V 15
%N 4
%R doi:10.14214/sf.a15378
%U https://silvafennica.fi/article/5151
%X <p>A model was constructed, the aim of which was to predict growth under conditions where air pollutants are present.&nbsp;The model&nbsp;is based on photosynthesis and on the allocation of photosynthetic products for growth. It is assumed that air pollutants released during energy production mainly affect photosynthesis in two ways: 1) directly by injuring the photosynthetic mechanism, and 2) indirectly by leaching nutrients. The two ways were studied empirically in order to identify a sub-model for the photosynthesis of a plant exposed to air pollutants.<span data-ccp-props="{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}">&nbsp;</span></p>
<p>The stand model will be applied to two purposes.&nbsp;The present stage of forests in Finland is compared with the simulated state based on the assumption that no pollutants are present. In addition,&nbsp;the decrease in forest yield under different conditions derived from predictions about long-range pollutant transport in Europe is analysed.</p>