文献类型：期刊文献

中文题名：幼化措施对日本落叶松生根力衰退的阻滞效应

英文题名：Retarding Effect of Juvenilization Measures on Rooting Ability Decline in Larix kaempferi

作者：韩华[1] 谢允慧[2] 张恺恺[2] 王笑山[2] 孙晓梅[2]

第一作者：韩华

机构：[1]林木遗传育种全国重点实验室(中国林业科学研究院),北京100091;[2]中国林业科学研究院林业研究所

年份：2025

卷号：53

期号：10

起止页码：1-6

中文期刊名：东北林业大学学报

外文期刊名：Journal of Northeast Forestry University

收录：;北大核心:【北大核心2023】；

基金：科技创新2030重大项目课题(2023ZD0405903)。

语种：中文

中文关键词：日本落叶松;无性系;插穗生根;连续扦插;修剪;幼化

外文关键词：Larix kaempferi;Clone;Cutting rooting;Successive cutting;Pruning;Juvenilization

分类号：S722.8+1

摘要：为探究日本落叶松(Larix kaempferi)扦插繁殖中的老龄化进程及其阻滞可能性,以日本落叶松无性系为研究对象,从造林后不同年龄阶段和连续扦插繁殖、修剪后无性系生根表现方面开展研究。结果表明,无性系造林10 a(株龄为12 a)后生根能力开始大幅下降,生根较好的台14无性系生根率、生根量和最长根长分别下降了16.5%、41.4%和66.5%,若不采取幼化措施,造林16 a(株龄为18 a)后该无性系生根率、生根量和最长根长分别下降67%、51.7%和81%,基本丧失扩繁利用的价值。从株龄7 a生的树形母株采穗扦插,营建二轮采穗圃,并每年进行整形修剪,其插穗生根率、扦插成活率和生长性状均较树形母株有显著改善,幼化效果显著。因此,根据无性系生根性状及测定林生长性状的初选结果,采集生根和生长兼优无性系的穗材营建二轮采穗圃,并结合适宜的母株修剪措施,能够有效延缓待测无性系的老龄化进程,加速优选无性系的繁殖与利用。
To explore the aging process and potential retardation in cutting propagation of Larix kaempferi,this study investigated clonal lines of L.kaempferi,focusing on rooting performance across different age stages after afforestation and in successive cutting propagations with pruning.The results showed that rooting ability significantly declined 10 years after afforestation(plant age 12 years).For the well-rooting clone Tai-14,rooting rate,rooting quantity,and maximum root length decreased by 16.5%,41.4%,and 66.5%,respectively.Without juvenilization measures,these indices would decline by 67%,51.7%,and 81%at 16 years after afforestation(ramet age 18 years),essentially losing clonal propagation value.Cutting shoots from 7-year-old mother plants to establish a second-generation cutting orchard,combined with annual pruning and shaping,significantly improved rooting rate,cutting survival rate,and growth traits,demonstrating notable juvenilization effects.Therefore,based on preliminary screening of rooting and growth traits,establishing second-generation cutting orchards with shoots from clones exhibiting both superior rooting and growth,coupled with appropriate mother plant pruning,can effectively delay the aging process and accelerate propagation and utilization of selected clones.