Loblolly Pine Provenance Variation in Age of Transition from Juvenile to Mature Wood Specific Gravity

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Abstract:

Regional and seed source variation were examined for the age of transition from juvenile to mature wood specific gravity in loblolly pine (Pinus taeda L.) grown in Arkansas. No regional or seed source differences were found for the age of transition or rate of change from juvenile to mature wood specific gravity with an analysis of variance "F" test. However, contrasts for groups of provenance regions defined on the basis of broad geographic characteristics showed transition ages were earlier for regions west of the Mississippi (12.0-12.3 yr) when compared to eastern regions (12.6-13.0 yr). Variation in whole core specific gravity and juvenile and mature wood core specific gravity was significant on a source and regional basis. No regional or source differences were found for percent summerwood. Specific gravity was highest in the lost pines source, followed by sources from the northwest and northeast portions of the loblolly pine range, and lowest for sources from the gulf coast and interior portions of the loblolly range. Contrasts for groups of provenance regions reflect similar results for all specific gravity traits. Percent summerwood, whole core specific gravity, and juvenile and mature wood core specific gravity had negative phenotypic correlations with transition age. Whole tree specific gravity, basal area, and percent summerwood had positive phenotypic correlations with estimated core specific gravity. For. Sci. 37(1):160-174.

Keywords: Whole tree specific gravity; basal area; core specific gravity; percent summerwood

Document Type: Journal Article

Affiliations: Professor, Department of Forestry, Oklahoma State University, Stillwater, OK 74078

Publication date: March 1, 1991

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