Forest Investment Account

Abstract of FII Project R2003-179

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Canopy cover effects on performance of three under-planted conifer species at Opax Mountain Silvicultural Systems Study.

Author(s): Vyse, Alan (BC Ministry of Forests)
Subject: Forestry, Silviculture/Forest Management Systems
Series: Forest Investment Account (FIA) - Forest Science Program


Growth performance of three conifer species (Pseudotsuga menziesii var. glauca, Pinus contorta latifolia, Pinus ponderosa) planted under different canopy levels were studied in relation to the estimated available light, BA, and environmental factors such as slope and aspect. Growth patterns of the seedlings were compared to those of surrounding mature trees to examine any characteristics of mature trees that can be used to predict seedling performance. Lodgepole pine (Pl) showed the greatest growth potential and the best growth rate in all light levels. At low light levels, growth performances of the other two species were very similar, but growth rate of Ponderosa pine (Py) becomes significantly greater at high light levels (seventy per cent or more of above-canopy light levels). Sigma13C values of seedlings were significantly positively related to volume growth, seemingly indicating that the high Sigma13C values were probably caused by increased nitrogen availability due to logging rather than by moisture stress.

For further information, please contact Alan Vyse, BC Ministry of Forests (

Updated September 08, 2005 

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