Variable retention harvests or 'green-tree retention systems' are an important management component of temperate zone coniferous forests. Green-tree retention may help enhance functional l inks among forest structures, ecological processes, and biological diversity found in natural forest ecosystems. This project was designed to determine if (i) diversity of stand structure attributes, (ii) abundance and diversity of forest floor small mammal communities, and (iii) relative habitat use by mule deer, will decline with decreasing levels of tree retention. This document reports on progress for year 4 of the 4-year project, Phase 2 (2000-2003), which was 5 to 8 years post-harvest. Our investigation has determined the influence of residual fir density and basal area on stand structure and mammal communities up to 8 years post-harvest. These results will provide guidelines for fir retention levels on harvested fir-pine forest units at a landscape scale, as well as two scientific manuscripts for publication and an extension brochure; to be completed in 2004.
Sullivan, Thomas P.. 2003. Influence of fir retention on stand structure and mammal communities in mixed Douglas-fir - lodgepole pine forests: annual report 2003-04. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2003MR045
Topic: FLNRORD Research Program
Keywords: wildlife, stand structure, variable retention, harvest
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