This study summarized the influence of planting density and material on the early performance of eucalypt plantation from a field trial. The effect of the planting density was highly significant on the ratio of height to DBH and stand volume （P 〈 0.01 ） , switched from non-significant to highly significant on DBH and individual volume over ages （ P 〈0.01 ）, and was not evident on survival and height. Except for survival, typhoon damage, and the ratio of height to DBH at 26-and 34-month old, the planting material affected all other characters investigated （P 〈0.01 ）. Significant interaction between block and density was found in all the characters, but significant interaction between block and clone was only found in the ratio of height to DBH at 26-month old. Planting density had negative linear relationship with the individual DBH and volume, and a quadratic relationship with the ratio of height to DBH and stand volume at 34-month old. Most well performing clones showed no marked difference, but huge superiority over the worst clone （U6） in stand volume （71.6% - 86.3% ） as well as in other characters. Some other issues concerning planting density and material were also discussed.
Forestry Science and Technology of Guangdong Province
Eucalyptus, planting density, clone, environment, yield