摘要
2002年在广东高要进行不同种植密度、无性系、造林模式、轮伐期、经营效益等多项内容的短周期桉树人工林试验，以分析造林密度和无性系对早期林分生长表现的影响。试验结果表明：种植密度对林木高径比和林分蓄积影响极为显著（P〈0．01），对胸径和单株材积的影响则随年龄的递增，从不显著转为极显著（P〈0．01），对成活率和树高的影响不明显；除成活率、风害率、26，34个月生林木高径比外，无性系对所有调查性状均有极显著的作用（P〈0．01）；区组和密度之间相互作用对所有性状的影响均呈极显著、显著或接近显著；除26个月生林木高径比外，遗传和区组互作均不显著。19个月生林木平均胸高直径和单株材积与密度没有明显关系，但34个月生时则随造林密度的增大而显著地直线下降；34月生林木高径比和林分蓄积与密度呈现曲线关系，在密度较低时，增长速率较大，随密度的进一步加大而变化平缓。表现优良的无性系间差别不显著，但其蓄积比表现最差的无性系（U6）大71．6％～86．3％，其它生长因子也表现出明显的优势。
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.
出处
《广东林业科技》
2006年第3期8-12,共5页
Forestry Science and Technology of Guangdong Province
关键词
桉树
种植密度
无性系
环境生长量
Eucalyptus, planting density, clone, environment, yield
