Abstract
Height growth for western white pine (Pinus monticola Dougl.) after five growing seasons (6 yr from seed) in the forest on Vancouver Island was assessed in a progeny test of 20 wind-pollinated families in two plantations: Northwest Bay (830 m) and Cassidy (20 m). Mean height differed at the 0.1% level of significance between plantations, with the better growth at Cassidy. Family mean heights differed at the 10, 1 and 5% levels of significance at Cassidy, Northwest Bay, and combined over plantations, respectively. Family-by-plantation interaction was nonsignificant. Pooled over plantations, the heritability estimates appropriate for mass and family selection were 0.36 ± 0.20 and 0.54 ± 0.28, respectively. The expected genetic gain estimates from multistage selection are used to provide preliminary guidelines for strategies which might be employed in the improvement of height growth of western white pine in coastal British Columbia.Key words: Western white pine, height, heritability, genetic gains
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