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The aim of our current BCFSP project is to validate the light sub-model of a forest growth model (FORGE) and to modify the model: (1) to more accurately describe the photosynthetic response of Douglas-fir seedlings growing in variable retention (VR) harvest plots and; (2) to include the effects of energy (solar and long wave radiation) and water (precipitation and evaporation) fluxes on tree seedling microclimate (temperature and moisture). Lastly we aim to: (3) validate the new version of FORGE, complete with energy and water balance sub-components. This research will provide quantitative information on the impact of VR silvicultural systems on seedling microclimate and the influence of retained patches and dispersed leave-trees on the establishment and growth of planted seedlings. Forest managers and policy makers will be able to plan more environmentally responsible harvesting systems. The improved version of FORGE will allow foresters to choose the best VR system to use given the soil, slope and stand characteristics. This work will greatly improve our understanding of VR systems and how they are likely to respond to changing climate.
T.A. (Andy) Black
Grant, Nick J., Black, T. Andy; Smith, N.; Raynor, Kurt; Jassal, P.. 2006. Effects of VR harvesting on microclimate, survival and growth of trees in British Columbia: executive summary of research activities 2005/6. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2006MR276
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