%0 Articles
%T Impacts of climate change and forest management on monoterpene emission and needle secondary compounds of Boreal Scots pine (<i>Pinus sylvestris</i> L.)
%A Räisänen, Tommi
%D 2008
%J Dissertationes Forestales
%V 2008
%N 72
%R doi:10.14214/df.72
%U http://dissertationesforestales.fi/article/1857
%X The boreal forests emit significant amounts of biogenic volatile organic compounds, including monoterpenes. Emitted monoterpenes have an impact on the physical and chemical properties of the lower troposphere. Changes in the emission potential of these forests are important, and it is essential to evaluate the effects of anthropogenic disturbances and the predicted climate change on the emissions. Hence, the objectives of this study were to quantify the monoterpene flux of a Scots pine forest stand, including the contribution of tree canopy to the total flux, to evaluate the effects of felling on the monoterpene concentration of Scots pine forest air, and to evaluate the effects of elevated CO<sub>2</sub> and temperature on monoterpene emission and needle secondary compounds of Scots pine. Timber felling significantly increased the ambient monoterpene concentration of the forest. Logging residue was the most important factor explaining the increment of the aerial concentration. The amount of monoterpenes released from the residue appeared to depend on its temperature, which is dependent on the microclimatical conditions of the managed site. Therefore, the shading of the remaining canopy cover can indirectly affect the monoterpene release from the emitting biomass. The significant increase in the concentration induced by the felling implies that there is a great potential impact of forest management on local atmospheric chemistry. The pine monoterpene emission was increased substantially due to elevation of CO<sub>2</sub> and temperature, whereas the monoterpenes within needles were reduced. Predicted changes in the tree species distribution in the Boreal zone will likely affect the monoterpene emissions of Scots pine on a larger scale. In the Finnish forests, the proportion of Scots pine is predicted to reduce, but the increased emission capacity of individual trees can compensate a great part of the loss of emitting biomass of Scots pine.