%0 Article
%T Responses of transplanted lichens to sulphur dioxide dosages - a new semi-statistical dosage/injury model.
%A Moseholm, Lars
%D 1981
%J Silva Fennica
%V 15
%N 4
%R doi:10.14214/sf.a15369
%U https://silvafennica.fi/article/5142
%X <p>A semi-statistical model is suggested for monitoring injuries of plants for long-time field exposures (months). The model is based on the following assumptions:</p>
<p>1. The concentrations of air pollutants in the atmosphere follow the Johnson SB distribution.</p>
<p>2. The degree of plant injury is proportional to the logarithm of air pollutant dose.</p>
<p>3. No injuries occur below a certain dose level.</p>
<p>4. A dose is defined as the air pollutant concentration multiplied by the duration of exposure raised to an exponent.</p>
<p>Based on the air pollutant frequency distribution a total dose for the exposure period is calculated by integration, and the total dose is related to the observed plant injury by non-linear regression. The model is tested for long-time exposures of sulphur dioxide to transplant lichen in natural environment.</p>