Geographic variation in tree growth and wood density of <Emphasis Type="Italic">Guazuma crinita</Emphasis> Mart. in the Peruvian Amazon |
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Authors: | John C Weber Carmen Sotelo Montes |
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Institution: | (1) World Agroforestry Centre (ICRAF), Apartado Postal 1558, Lima, Peru;(2) Present address: World Agroforestry Centre (ICRAF), B.P. 320, Bamako, Mali;(3) Present address: Consultant, Lima, Peru |
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Abstract: | Guazuma crinita Mart. is a fast-growing timber tree in the Peruvian Amazon. A trial of 11 Peruvian provenances was established in three planting
zones. Tree growth at 6, 12, 18 and 30 months and wood density at 32 months were analyzed across and within zones. Zones accounted
for more variation than provenances. Density varied significantly due to provenances in the analysis across zones, whereas
growth exhibited strong provenance by zone interactions. The local provenance grew well and produced relatively dense wood
in all zones. The relative magnitude of variation due to provenances depended on the planting zone. Density was greater in
the lower than in the upper stem. Density increased with longitude from the more humid to the drier part of the sample region.
In general, correlations indicated that larger trees had lower density and a larger difference in density between the lower
and upper stem, but the strength of these relationships depended on the provenance and zone. Results suggest that fast-growing
provenances can be selected at an early age without significantly reducing wood density. The local provenance is recommended
for reforestation pending future research demonstrating the superiority of foreign provenances. Some practical implications
for tree-improvement programs are discussed. |
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Keywords: | Provenance Environment Interaction Juvenile wood Correlations |
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