摘要
台风危害是影响华南地区桉树人工林产量的主要因素之一,选育抗风性和速生性兼具的新品种是解决此问题的根本途径。受限于育种周期,研究了不同桉树无性系的嵌套混交对其人工林整体抗风能力的改善效应,并兼顾林地产量。将速生的GL4和抗风的LH1两个桉树无性系,以不同的数量比例随机嵌套混交种植。分别于26和48月龄时,对试验林进行每木生长量调查。结果显示:随着抗风的LH1数量的增加,GL4和LH1的胸径、树高和平均单株材积基本均呈现逐渐增大的趋势,速生与抗风性无性系的嵌套混交对两类桉树无性系的生长均具有促进作用,但每个处理的总材积生长随着LH1数量的增加而下降。速生与抗风桉树无性系的嵌套混交比例对两者生长的影响具有显著性差异(α=5%)。本研究结果表明,抗风和速生桉树无性系的嵌套混交具有促进彼此生长的效应,不同桉树无性系的嵌套混交既缓解了桉树纯林的一些弊端,又解决了桉树与其它树种混交时的生长速率差异问题,对探索桉树人工林混交栽培模式具有一定的借鉴意义。
One of the key factors impacting the productivity of eucalypt plantations in southern China is typhoons.Selecting new clones with both wind resistance and fast growth in breeding programs is a basic way to address this challenge.We studied the effect of nested plantings of different clones on the whole wind resistance of eucalypt plantations,as limited by the breeding cycle,and taking into account plantation productivity.In current study,the fast-growing clone GL4 and the wind resistance clone LH1 were planted in a randomly nested pattern with various designed proportions.At the age of 26 and 48 months,the growth performance of the trial was investigated.The results showed that DBH,tree height and average individual tree volume of GL4 and LH1 both increased gradually with the increase of the proportion of LH1.The nested planting of fast-growing and wind resistant clones promoted the growth of the two clones,but the total volume of each treatment decreased with the increase of the proportion of LH1.There was a significant difference(α=5%)among the nested planting proportions for the fast-growing and wind resistance clones.The findings suggested that the nested planting of wind resistance and fast-growing clones could promote overall growth and that nested planting of different eucalypts clones can not only alleviate some disadvantages of pure eucalypts plantations but avoid the problem of growth rate differences commonly encountered when eucalypts are planted in mixtures with other(non-eucalypt)tree species.The results provide a reference for exploring mixed cultivation mode of eucalypts plantations.
作者
黄黎敏
樊林华
廖泽毅
卢万鸿
王楚彪
林彦
罗建中
HUANG Limin;FAN Linhua;LIAO Zeyi;LU Wanhong;WANG Chubiao;LIN Yan;LUO Jianzhong(Guangxi Gaofeng State-owned Forest Farm,Nanning 530002,Guangxi,China;China Forestry Group Leizhou Forestry Bureau Co.,Ltd.,Zhanjiang 524043,Guangdong,China;China Eucalypt Research Centre,Zhanjiang 524022,Guangdong,China)
出处
《桉树科技》
2021年第2期33-37,共5页
Eucalypt Science & Technology
基金
“十三五”科技部重点研发计划课题“桉树高纤维纸浆材定向培育技术”(2016YFD0600503)
广西创新驱动发展专项资金项目“广西主要用材林高效培育与利用”(桂科AA17204087-6)。
关键词
桉树无性系
嵌套混交
抗风能力
eucalypt clones
nested planting
resistant to wind
