从化桉树、南洋楹速生丰产林的生长表现调查

本文通过对广州市北部山区从化市2年半生的桉树、南洋楹速生丰产林的生长表现进行调查，结果表明：在两个标准样地间，桉树、南洋楹的平均胸径以及南洋楹的平均分枝数无显著差异，而平均树高差异显著，说明桉树、南洋楹的胸径生长以及南洋楹的分枝数受遗传控制的程度较高，而树高生长受环境条件影响较大；桉树与南洋楹在平均胸径与平均树高两个性状上均达到极显著差异，并且这两个性状的变异系数，桉树均比南洋楹小，说明桉树的胸径生长和树高生长均比南洋楹稳定，受环境条件的影响较小，所能适应的立地条件和环境条件较南洋楹广泛。

The Analysis on growth performance of Eucalyptus urophylla U6 clone and Albizia falcataria rapid growth and high yield forest

The Analysis on growth performance at age of2.5years old of Eucalyptus urophylla U6clone and Albizia falcataria rapid growth and high yield forest in Conghua are analysed on two standard plots data,the mean increment of height,D.B.H and mean branch numbers are measured.The results showthat both the mean increment of D.B.H of Eucalyptus robusta and Albizia falcataria and mean branch numbers of Albizia falcataria affected by genes in more degree.The CV of the mean increment of height and D.B.H of Eucalyptus robusta are lower than Albizia falcataria,which show that Eucalyptus robusta can suit abroad.