Forest Investment Account

Abstract of FIA Project 2214004

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Natural regeneration of lodgepole pine in central interior British Columbia: Ten year results regarding the effects of seedbed, harvesting method, and chain-dragging

Author(s): Walker, Brian
Subject: British Columbia, Forestry, Silviculture/Forest Management Systems
Series: Forest Investment Account (FIA) - Land Base Investment Program - Innovative


An experiment was established in 1992 on an SBS site near Fraser Lake to test the effects of two harvesting treatments: a) processing at the roadside and b) processing at the stump, and two site preparation treatments: a) chain-dragging, and b) untreated on natural regeneration of lodgepole pine. Germination and survival were monitored on four substrates: a) organic, b) pressed organic, c) mixed mineral-organic, and d) mineral soil. First year germination and survival were high (13,000-32,000 germinants/ha) and a further 500-2500 germinants/ha appeared during the second year. After 10 years, more than 80% of the lodgepole pine germinants that were present two years after harvesting continued to survive. Chain-dragging had a slightly negative effect on early germination, probably because pine seed was released during the 4-5 month delay between harvesting and site preparation. As a result, rather than creating suitable seedbed, the treatment most likely disturbed existing germinants. After 10 years, 25,000 - 29,000 pine seedlings/ha survived in the process-at-roadside/untreated, process-at-stump/untreated, and process-at-roadside/chain-dragged treatments. Approximately 12,000 seedlings/ha survived where processing-at-stump harvesting had been followed by chain dragging. The high rates of germination and survival on this site were attributed mainly to wet June weather in the first two years after harvesting.

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Updated September 08, 2005 

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