杉木良种幼林期生长动态对比分析

Dynamic Comparative Analysis on Growth of Chinese Fir Cultivar in Juvenile Stage

对福建省将乐国有林场在不同立地条件下营建的8个杉木良种对比试验林,分析其3~11年生时的生长差异性。结果表明:品种间生长性状在各林龄差异均达到极显著水平,而品种与立地的交互作用同样显著影响着生长性状,特别是在7年生前其作用较品种的影响作用更明显,之后2种影响作用在11年生时逐渐达到平衡。11年生时,品种对树高、胸径和单株立木材积的方差贡献率分别为25.67%、17.59%和20.80%,品种与立地交互作用对树高、胸径和单株立木材积的方差贡献率分别为28.23%、16.48%和17.31%。以单株立木材积为主要指标,筛选出洋003无性系、官庄2代种子园良种为广谱适宜速生品种;Ⅲ类立地最适宜速生品种为官庄2代种子园良种,Ⅱ~Ⅲ类立地和Ⅰ~Ⅱ类立地最适宜速生品种为洋003无性系。7年生时有的品种的林分内已经产生株间竞争,并首先明显作用于胸径,致使单株间胸径差异加大,进而逐步影响单株立木材积,可进行初次抚育间伐。

The growth difference of 8 cultivars at the age of 3~11 years was analyzed based on 11-year old test plantation on National Forest Farm of Jiangle.Significant differences on growth were examined among cultivars at all testing ages.In addition,the interaction between cultivar and site also significantly affected growth,being more obviously than cultivar before 7-year old.And then the effects on growth of cultivar and interaction gradually reach a balance at 11-year old.The variance contribution rates of cultivar to tree height,DBH and volume were 25.67%,17.59%and 20.80%,at 11-year old,respectively.And that of interaction were 28.23%,16.48%and 17.31,respectively.Based on individual volume,Yang 003 clone and the seedlings from Guanzhuang 2 nd generation seed orchard were considered as suitable fast growing cultivars for all sites.Furthermore,the seedlings from Guanzhuang 2 nd generation seed orchard were the most suitable cultivar for typeⅢsite,and Yang 003 clone was the most suitable cultivar for typeⅡ~ⅢandⅠ~Ⅱsite.Additively,the competition among plants had already occurred in some cultivars at 7-year old,which firstly leads to the increase of DBH differences among individuals and then gradually affects the volume,giving important information for Chinese Fir plantation thinning.