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PROVENANCE PRODUCTIVITY IN PINUS CARIBAEA AND ITS INTERACTION WITH ENVIRONMENT

1983; Commonwealth Forestry Association; Volume: 62; Issue: 2 Linguagem: Inglês

0010-3381

G.L. Gibson, R.D. Barnes, J. Berrington,

Forest Biomass Utilization and Management

SUMMARY Sixteen Pinus caribaea Morelet provenance trials from the Commonwealth Forestry Institute international series were selected to cover the range of climatic conditions suitable for afforestation with the species. Height, diameter and bark thickness were measured, and bark percentage and volume under bark calculated for 19 provenances which were unequally represented in the trials; the provenance-locality table had 205 entries out of a possible total of 304. Provenance mean values over sites were calculated, adjusted where necessary for sites where provenances were not grown. A non-orthogonal, weighted analysis was performed to estimate the significance and magnitude of provenance and locality effects and their interaction; the latter was statistically significant but the proportion of total variance explained was small, e.g. for volume under bark, localities accounted for 67%, localities plus provenances 79% and localities plus provenances plus interaction 80%. However, important reversals in ranking between inland and coastal provenances of P. caribaea var. hondurensis Barrett and Golfari do occur at the environmental extremes. Productivity of P. caribaea var. hondurensis was superior to P. caribaea var. caribaea and P. caribaea var. bahamensis Barrett and Golfari at all localities. There were significant differences between the P. caribaea var. hondurensis provenances. Among the most productive were Laguna el Pinar, Alamicamba and Karawala from the coastal lowlands, Santa Clara, Los Briones, Poptun, Culmi, Potosi and Mountain Pine Ridge from inland areas, and Guanaja, the only insular source. Many provenances were shown to be better producers than Mountain Pine Ridge, the source of most exotic afforestation programmes to date, but Byfield, a Queensland select provenance developed from Mountain Pine Ridge, was the highest producer of all provenances. Although operational forestry would benefit from the use of such select land races, the more productive provenances should be used to establish new, potentially more productive, breeding populations.