Forest Science Program

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Conifer and vegetation response in the BWBSmw1 12 years after mechanical and herbicide site preparation

Author(s) or contact(s): G.J. Harper, L.J. Herring, and W.J. Hays-Byl
Source: Forest Science Program
Subject: Vegetation Management
Series: Working Paper
Other details:  Published 1997. Hardcopy is available.


Experimental project (ep) 1195 was established in 1995 to remeasure previously established vegetation management research trials. This project was developed in response to operational and land management needs for long-term data on crop tree response to vegetation management treatments. Research on the silvicultural implications of vegetation management treatments has historically focused on providing short-term data to support plantation establishment information needs. However, the demand for long-term information has increased substantially because of recent changes in provincial forestry legislation and policy (Forest Act, 1988 and The Forest Practices Code of B.C. Act, 1995) and societal concern over the management of Crown lands. The forest industry is now required to regenerate young forests. As well, social change has put pressure on land managers to reduce herbicide use and develop vegetation management alternatives that are both effective and non-intrusive on other forest resources. These developments have intensified the need for long-term information that assesses the effects of brushing activities. Information is required for timber growth-and-yield projections, to assess impacts on non-timber resources and resource user groups, to expand our knowledge of applied forest biology, and ultimately to improve forest management practices.

During 1994 and 1995, several vegetation management trials were evaluated ( > 5 years post-treatment) for the possibility of remeasurement to obtain long-term conifer response data. Candidate research trials were screened using published and unpublished reports, experimental design, field surveys, and communications with operational and research staff. Of those candidate trials, the Sunset Prairie and Stewart Lake projects in the Dawson Creek Forest District were chosen for remeasurement. These trials were established by Les Herring (research silviculturist) in 1982-1983. This report summarizes the data collected during November 1995 and August 1996 at the Stewart Lake herbicide trial.

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Updated November 04, 2009