通直型和弯扭型云南松实生幼苗生长性状分析  

Growth Traits of Pinus yunnanensis Franch.Seedlings with Straight and Twisted Stems

作　　者：李富荣 杨江敏 陈诗[2] 李木东 徐保燕 余贵湘 李希晓 LI Fu-rong;YANG Jiang-min;CHEN Shi;LI Mu-dong;XU Bao-yan;YU Gui-xiang;LI Xi-xiao(Dehong Institute of Forestry,Ruili 678600,PRC;Key Laboratory of Ministry of Education for Forest Resources Conservation and Utilization in the Southwest Mountains of China,Southwest Forestry University,Kunming 650224,PRC)

机构地区：[1]德宏州林业科学研究所,云南瑞丽678600 [2]西南林业大学西南山地森林资源保育与利用教育部重点实验室,云南昆明650224

出　　处：《湖南农业科学》2024年第5期85-89,共5页Hunan Agricultural Sciences

基　　金：国家自然科学基金(31360189)。

摘　　要：从云南新平采集通直和弯扭2种茎干类型各25个家系的云南松种子进行播种育苗,对一年生幼苗苗高和地径的生长量进行测定,分析2种茎干类型云南松子代苗木的生长特性。结果表明:通直型和弯扭型云南松幼苗的苗高、地径均呈现“慢—快—慢”的生长节律,整体符合“S”型曲线;通直型和弯扭型云南松一年生幼苗苗高的速生期持续时间较长,地径的速生期持续时间较短,但速生期苗高和地径的净生长量均对生长量的贡献率最大;苗高和地径存在异速生长现象;通直型云南松苗高的长势比弯扭型好,其幼苗苗高的线性生长期小于弯扭型,但生长参数均大于弯扭型;弯扭型云南松地径的长势比通直型好,2种茎干类型云南松幼苗地径的线性生长期差异较小,但弯扭型地径的生长参数略大于通直型。总体而言,通直型云南松一年生实生幼苗的总体生长情况较弯扭型云南松好,建议选择茎干通直的优良林木作为云南松人工林母树,为大规模国土绿化行动和国家储备林建设项目提供良种壮苗。The seeds of 25 lines with straight stems and 25 lines with twisted stems of Pinus yunnanensis Franch.were collected from Xinping in Yunnan.The seeds were sown,and the heights and ground diameters of one-year-old seedlings were measured,on the basis of which the growth traits of P.yunnanensis Franch.with two different stem types were analyzed.The results showed that the heights and ground diameters of the seedlings with straight and twisted stems presented the S-shaped trend of slow growth-fast growth-slow growth.The rapid growth stage of seedling height lasted longer while that of ground diameter was shorter.The net increments of both seedling height and ground diameter at the rapid growth stage contributed most to the growth.Seedling height and ground diameter demonstrated allometry.Regarding the seedling height,the seedlings with straight stems showcased better growth performance than those with twisted stems,with shorter linear growth stage and greater growth parameters than the seedlings with twisted stems.In terms of the ground diameter,the seedlings with twisted stems presented better growth performance than those with straight stems,showing slight difference in the linear growth stage and larger growth parameters than the seedlings with straight stems.In general,the one-year-old seedlings with straight stems demonstrated better growth performance than those with twisted stems.It is therefore suggested that the lines with straight stems should be selected for the plantation of P.yunnanensis Franch.and to serve as elite lines for national afforestation and reserve forest construction.

关 键 词：云南松 苗木 茎干类型 生长 LOGISTIC方程 

分 类 号：S791.257[农业科学—林木遗传育种]