Family by environment interactions for loblolly and slash pine plantations in the southeastern United StatesThis article is part of a larger document. View the larger document here.
Few studies have quantified the combined effects of silvicultural treatments and genetic improvement on unit area production of full-sib family blocks of loblolly and slash pine. We examined genotype (family) by environmental interactions (G x E) through age five years using a factorial experiment consisting of silvicultural treatment intensity, planting density and full-sib families Five years after planting, both loblolly and slash pine demonstrated significant interactions among several factors: G by site (p < 0.028 and p < 0.016 respectively) and G by silvicultural treatment intensity (p < 0.055 and p < 0.059 for basal area and standing stem volume). G by silvicultural treatment interactions were positive, large and of the scale-type effe. . Changes in slash pine family rankings between sites were partly explained by a combination of fusiform rust infection [Cronartium quercum (Berk.) Miyabe ex Shirai f. sp. fusiforme] and wind damage from the 2004 hurricane season.