低效林改造树种早期生长分析

为筛选出适宜粤东地区林分改造的乡土阔叶树种，通过分析火力楠、山杜英、毛果青冈、红锥和中华楠5个树种早期生长的保存率、树高、地径和冠幅等指标，结果表明，5个树种的保存率均在90%以上，具有较强的适应性；树高、地径和冠幅三者之间呈显著正相关，各树种间也存在一定差异；聚类分析表明，5个树种分为3类，火力楠和山杜英为速生树种，红锥和毛果青冈次之，中华楠生长最慢。5个树种均为优良珍贵乡土阔叶树种，适应性强，在林分改造中，可根据树种生长特性进行合理搭配，确保改造效果。

Early Growth of Tree Species in Low Efficiency Forest Transformation

In order to screen out the native broad-leaved tree species suitable for stand transformation in eastern Guangdong, the preservation rate, tree height, ground diameter and crown width of five tree species of Michelia macclurei, Elaeocarpus sylvestris, Cyclobalanopsis pachyloma, Castanopsis hystrix and Machilus chinensis in early growth were analyzed. The results showed that the preservation rate of five tree species which had strong adaptability were all above 90%; there were significant positive correlations among tree height, ground diameter and crown width, and there were some differences among tree species; the cluster analysis showed that the five tree species were divided into three groups, Michelia macclurei and Elaeocarpus sylvestris were the fast-growing tree species, followed by Castanopsis hystrix and Cyclobalanopsis pachyloma, Machilus chinensis was the slowest. The five tree species were excellent and precious native broad-leaved tree species in eastern Guangdong. In the stand transformation, the corresponding tree species could be selected for reasonable collocation to ensure the transformation effect.