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Wood anatomy of five dipterocarp species endemic to the Philippines was studied with the goal to explore functional wood traits of ecological significance. Stem wood of 6-year-old trees grown under similar environmental conditions in a plantation (Leyte, Philippines) was used. Wood densities decreased in the following order Hopea plagata > Dipterocarpus kerrii > Parashorea malaanoman > Shorea almon ≈ Shorea contorta. This was mainly caused by significantly thicker fiber cell walls of H. plagata and D. kerrii than those of the other three species. Wood density was negatively correlated with the abundance of axial parenchyma cells. Predicted conductance was independent from wood density and lowest in H. plataga and highest in D. kerrii and S. contorta. These results indicate that H. plagata and D. kerrii is woods have higher constructions costs in term of carbon per unit of biomass, and that H. plagata is probably better acclimated to varying soil moisture than the other species.

Functional anatomy of five endangered tropical timber wood species of the family Dipterocarpaceae