大花序桉家系在桂西南生长性状分析

Analysis on Growth Characters of Families Eucalyptus cloeziana in Southwest Guangxi

以三个大花序桉优良家系为材料,通过对2.75、3.5、5.5年生的大花序桉生长性状调查,评价其在广西桂西南地区的生长表现。结果表明:三个家系在树高、胸径、材积等生长性状方面存在极显著差异。其中5.5年生1212、1203、1204三个家系的平均树高为17.6m、15.4m、13.0m;平均胸径为13.8cm、12.7cm、11.3cm;平均单株材积为0.124m^(3)、0.094m^(3)、0.064m^(3)。5.5年生三个家系蓄积量分别为180.970m^(3)/hm^(2)、137.759m^(3)/hm^(2)、78.005m^(3)/hm^(2),其中1212表现最优,适宜在桂西南推广种植。

Taking three excellent families of Eucalyptus grandiflora as materials,the growth characteris-tics of Eucalyptus grandiflora aged 2.75,3.5 and 5.5 years were investigated to evaluate its growth per-formance in southwest Guangxi.The resuls showed that there were significant differences in tree height,DBH and volume among the three families.The average tree height of the5.5 year old 1212,1203 and 1204 families is 17.6m,15.4m and 13.0m;The average DBH was 13.8 cm,12.7 cm and 11.3 cm;The average volume per plant is0.124 m^(3),0.094 m^(3) and 0.064 m^(3).The stock volume of the three fami-lies born in5.5 years is 180.970m^(3)/hm^(2),137.759m^(3)/hm^(2) and 78.005m^(3)/hm^(2) respectively,of which 1212 is the best and suitable for planting in southwest Guangxi.