Analysis on OvenDry Density Change in the Wood Among Different Provenances of Paulownia tomentosa

The ovendry wood density of 5 provenances of Paulownia tomentosa was determined, compared and analyzed. The results showed that there were significant differences in the wood density among the different provenances. The density difference between the Gaomi provenance from Shandong Province and the Xiangtan provenance from Henan Province was significant, while the differences among the rest provenances were extremely significant. The study also showed that there were extremely significant differences among the wood samples taken from the base, mid and top parts of the same plant. There was no significant difference between the heartwood and middle wood; there was significant difference between the heartwood and sapwood; whereas there was extremely significant difference in the wood density between the middle wood and sapwood.