Geographic Variation and Local Growth Superiority for Coastal Douglas-fir - Rotation-age Growth Performance in a Douglas-fir Provenance Test

摘要

Rotation-age growth performance of 16 provenances and local growth superiority were assessed from a rotation-age reciprocal coastal Douglas-fir [Pseudotsuga rnenziesii var. menziesii (Mirb.) Franco] provenance test established in the Pacific Northwest of America. Provenance differences for total volume per plot were highly significant. Due to the significant provenance x site interaction effect, the best provenances varied across planting sites in terms of rotation-age volume growth. Local provenance trees exhibited superior volume growth at two of the six planting sites. At the remaining four sites, local provenances performed equally well as average non-local provenances. At the three low-elevation ( 460 m) sites, low-elevation provenances performed significantly better than high-elevation provenances. By contrast, high- and low-elevation provenances had similar growth at the two high-elevation (> 800 m) sites. Southern provenances generally grew faster than northern provenances at the Oregon sites, while northern provenances performed better than southern provenances at the sites in British Columbia.