母株年龄和插穗基部切削方式对日本落叶松生根的影响  

The Effect of Age and Basal-cut Shapes of Cutting on Rooting of Larix leptolepis

作　　者：王笑山[1] 胡新生[1] 王有才 聂军 刘素梅 

机构地区：[1]中国林业科学研究院林业研究所 [2]辽宁省清原县大孤家林场

出　　处：《林业科学研究》1993年第6期627-632,共6页Forest Research

基　　金：世界银行贷款国家造林项目"落叶松丰产栽培技术研究与推广"

摘　　要：在无激素处理的条件下,1.5年生幼龄母株的插穗易于生根,平均生根率达96.0％以上,且发根量大,偏根率低;4.5年生时,插穗生根率极显著低于1.5年生母株,而与8.5年生母株无显著差异;12.5年生母株插穗生根率又极显著低于8.5年生母株。母株年龄与插穗生根率和偏根率分别呈显著的负相关(r=-0.9652)和极显著正相关(r=0.9993),但与生根量和平均最长根长度无显著相关。插穗基部切削方式不同,偏根率有显著的差异,但切削方式不同对生根率无明显的影响。单面切、双面切的插穗,不定根多发生在基部未经切削部位的最下端。基部平切省工省时有利于减少偏根率和提高根系质量,适于日本落叶松半木质化插穗大批量扦插育苗时采用。Age effect of the stock plants and the effect of the basal-cut shapes in cuttings of L. leptolepis on rooting ability were studied by using softwood cutting in the absence of growth hormones. Rooting rate was particular high (96.9%) for cuttings taken from 1.5-year-old stock plants. Better rooting rate were obtained when cuttings taken from 4.5 to 8.5 years old stock plants (72.1%~78.1 %). Average number of root per cutting decreased significantly for cuttings taken from 8.5 years old stock plants when comparing with 1.5~4.5 year old plants. Rooting rate was negatively related with the age of stock plants (r = -0.9652*) and one-side rooting rate, however, was positive related with the age (r = 0.999 3**) . Numder of roots per rooting cutting and maximum root length on average were not related with the age of stock plants. There was obvious difference in one-side rooting rate between different shapes of basal cut (F = 12.336 2**), but no difference could be found for rooting rate. Adventitious roots developed only at the end (which has not been cut) of cuttings for one-side cut and V-shaped cut. Flat-cut at the base of cuttings reduced the one-side rooting rate which is helpful to improve the root quality of the rooting cuttings.

关 键 词：日本落叶松 母株年龄 切削 生根率 

分 类 号：S791.223[农业科学—林木遗传育种]