秃杉优树自由授粉子代测定研究

通过对24个秃杉Taiwania flousiana优树自由授粉子代、台湾杉T.cryptomerioides和香杉Cunninghamia kon-ishii的苗期及田间造林试验,观测分析了3树种场圃发芽率及高生长节律特征,用Marquardt方法拟合了Logistic苗高生长曲线,利用6年生秃杉自由授粉家系和台湾杉生长性状数据,采用方差分析法分析树种间差异显著性,以及秃杉自由授粉家系间差异显著性,并估算秃杉生长性状遗传参数,初步选择了6个优良的秃杉优树自由授粉家系.结果表明:秃杉、台湾杉和香杉3树种的平均场圃发芽率分别为9.1%、11.3%和1.3%,一年生平均苗高为25.1、22.9和24.4 cm,3树种苗高生长速生期开始及结束日期依次推后;秃杉与台湾杉的生长性状树种间差异显著,秃杉的生长性状家系间差异显著;秃杉自由授粉家系的胸径、树高和单株材积的遗传力分别为0.88、0.87和0.91,从19个家系中选择6个优良家系,单株材积遗传增益为52.6%,现实增益为58.1%.

Open-Pollination Progeny Test for Superior Tree of Taiwania flousiana

Seedling and field afforestation test for 24 open-pollination progenies of superior trees,i.e.,Taiwania flousiana,Taiwania cryptomerioides and Cunninghamia konishii,were carried out.The research included 3 species' nursery germination rate and height rhythm,curve fitting using Logistic growth model of seedling height by the Marquardt method,significance comparison between species and among T.flousiana open-pollination families by variance analysis method with 6-years-old data,and an evaluation of genetic parameter of T.flousiana growth straits.6 excellent T.flousiana open-pollination families were tentatively selected.The average nursery germination rate of the 3 species were 9.1%,11.3% and 1.3%,respectively.The average height of 1-year-old seedling were 25.1,22.9 and 24.4 cm.The starting and ending date of fast growing period for seedling height growth of the 3 species came later consecutively.The differences of growth traits were significant between species,and among T.flousiana open-pollination families.Heritabilities for DBH,height,single volume of T.flousiana open-pollination family were 0.88,0.87,and 0.91,respectively,six families were selected for 19 families with genetic gain of 52.6% and realized gain of 58.1%.