Forest Investment Account

Abstract of FII Project R04-084

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An evaluation of Douglas-fir leave-tree retention practices in central British Columbia

Author(s): Hawkins, Chris (University of Northern British Columbia)
Subject: Forestry, Policy, Silviculture/Forest Management Systems
Series: Forest Investment Account (FIA) - Forest Science Program


There is inconsistent survival of Douglas-fir leave trees within retention silviculture systems in the Prince George TSA. The trees are left to help maintain biodiversity and forest structure, and to conserve important wildlife habitat. High leave tree mortality jeopardizes the objectives. Preliminary investigation directed the focus of this study on the measurement of possible changes in pre and post harvest water relations around Douglas-fir leave-trees, and the potential stresses that these changes may place on the trees. Transpiration (evaporative demand), and available soil moisture will be examined for large old Douglas-fir leavetrees in harvested and unharvested areas. The study will determine whether mortality is random or non random, identify silviculture practices that reduce leave tree mortality; and evaluate the contribution of live and dead Douglas-fir to wildlife habitat. A mortality Risk Index assessment for leave trees will also be designed.

For further information, please contact Chris Hawkins, University of Northern British Columbia (

Updated September 08, 2005 

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