Coastal Douglas-fir provenance variation: patterns and predictions for British Columbia seed transfer

Variation des provenances côtières de sapin de Douglas : modèles et prévisions pour le transfert des semences de Colombie-Britannique

Abstract

  • • We evaluated performance variability in two series of provenance trials of Pseudotsuga menziesii var. menziesii. EP 480 included 16 reciprocal provenances planted from British Columbia to Oregon, measured up to age 45. EP 599.03 featured five common provenances, plus the local source, planted at 23 British Columbia sites, measured up to age 33.

  • • Although residual variance was high, site accounted for 31 to 60% of the volume variance, while provenance accounted for 1–6%. Interactions were also significant across ages and trials. Genotype-environment interaction was evident in EP 599.03, but not EP 480, which may reflect differences in experimental design.

  • • The worst provenances always ranked low across sites and over time. No geographic or climatic (annual, seasonal, monthly) variables consistently explained patterns of volume across sites or ages, singly or in combination for either trial, similar to findings from other studies of coastal Douglas-fir. Provenances from Washington to central Oregon often performed as well as the local provenance or better at British Columbia trial sites. Populations from higher elevations, poor sites and submaritime provenances were less vigorous.

  • • Results support maintaining elevational and ecotypic transfer limits, emphasizing site-specific decision making, and permitting wider latitudinal transfer on similar quality sites.

Résumé

  • • Nous avons évalué la variabilité des performances de provenances de Pseudotsuga menziesii var. menziesii dans deux séries d’essais. EP 480 comprend 16 provenances réciproques plantées de la Colombie-Britannique à l’Oregon, mesurées jusqu’à 45 ans. Dans EP 599.03 figurent cinq provenances communes, ainsi que la source locale, plantées dans 23 sites en Colombie-Britannique, mesurées jusqu’à 33 ans.

  • • Bien que la variance résiduelle soit élevée, le site a représenté 31 à 60 % de la variance du volume, tandis que la provenance représentait 1.6 %. Les interactions ont également été significatives dans les âges et les essais. L’interaction génotype-environnement est évidente dans EP 599,03, mais pas dans EP 480, ce qui peut refléter des différences dans la conception expérimentale.

  • • Les mauvaises provenances sont toujours classées bas à travers les sites et au cours du temps. Aucune variable géographique ou climatique (annuelle, saisonnière, mensuelle) n’a constamment expliqué les modèles de volume à travers les sites ou les âges, séparément ou en association pour n’importe lequel des essais, similairement aux résultats d’autres études sur les provenances côtières de sapin de Douglas. Les provenances de l’État de Washington jusqu’au centre de l’Oregon sont souvent aussi bien performantes que la provenance locale ou meilleures dans les sites d’essais en Colombie-Britannique. Les populations des plus hautes altitudes, des sites pauvres et les provenances sub-maritimes ont été moins vigoureuses.

  • • Les résultats sont en faveur du maintien de transferts altitudinaux et écotypiques limités, en mettant l’accent sur une prise de décision spécifique au niveau du site, et en permettant un transfert latitudinal plus grand sur des sites de qualité semblables.

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Correspondence to Jodie Krakowski.

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Krakowski, J., Stoehr, M.u. Coastal Douglas-fir provenance variation: patterns and predictions for British Columbia seed transfer. Ann. For. Sci. 66, 811 (2009). https://doi.org/10.1051/forest/2009069

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Keywords

  • adaptation
  • genecology
  • provenance
  • Pseudotsuga menziesii
  • seed transfer

Mots-clés

  • adaptation
  • génécologie
  • provenance
  • Pseudotsuga menziesii
  • transfert de semence