生长调节剂对落叶松杂种生根和幼苗生长的影响

该文利用方差分析及多重比较的方法研究了不同生长调节剂、处理浓度对不同日本落叶松×长白落叶松杂交组合半木质化插穗生根能力及扦插幼苗生长的影响，并选配出了有利于提高插穗生根能力的最佳生根促进剂配方. 研究表明:参试杂交组合间生根能力差异不显著，生长调节剂处理与杂交组合的交互作用也不明显; 适宜的生长调节剂处理对促进落叶松杂种插穗生根有一定作用，尤其对促进根系发育、增加生根量和降低偏根率的作用十分显著；虽然不同浓度IBA处理（100～300 mg/L）对苗期生长的影响未达显著水平，但经处理的生根插穗大田移栽成活率、苗高和地径均高于对照；较高浓度IBA处理（400 mg/L）和生长调节剂配合处理对落叶松杂种半木质化插穗生根率、平均生根量和偏根率有明显的改善作用，其中添加少量维生素的L4配方插穗生根率高达93%，每穗平均生根量多达9.4条，偏根率下降到4.5%. 

Effects of growth regulators on nursery rooting and seedling growth of hybrid larch.

Based on rooting experiments of summer semi_hardwood cuttings of hybridlarch (Larix leptolepis×L. olgensis) in the Dagujia Forest Farm, Liaoning Province, the authors analysed the effects of various plant growth regulators or commercially available rooting compound (ABT rooting promoter) on the rooting ability and growth of rooted cuttings using variance analysis and LSD tests. Suitable growth regulators or rooting compounds and their optimal concentrations are recommended. The results show that there was no significant difference in rooting ability among hybrid families and interaction effect between growth regulator treatments and hybrid families. Suitable treatments of growth regulator and concentration affected the rooting ability and significantly improved the root number per cutting and one_sided rooting rate of rooted cuttings. Although the concentrations of IBA had no significant effect on the survival rate of rooted cuttings, nursery tree heights and base diameters were all higher than those of water controlled treatments. The higher concentration of IBA (400 mg/L) and rooting compound, especially compound L4, had significantly improved rooting ability and root quality; the percentage of rooted cutting was up to 93%, mean root number per cutting was 9.4, but the one_sided rooting rateof rooted cuttings was only 4.5%. 9