桤木自然分布区内表型变异的研究  

Study on Phenotypic Variation in Natural Range of Longpeduncled alder ( Alnus cremastogyne )

作　　者：陈益泰[1] 李桂英[1] 王惠雄[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400

出　　处：《林业科学研究》1999年第4期379-385,共7页Forest Research

基　　金：.NULL

摘　　要：调查研究了我国桤木自然分布区四川盆地及其周边地区 2 1个不同产地桤木天然林或人工林的生长、果实形态、树皮形态、干形、材色和木材密度等表型特征 ,发现桤木种内存在着极其丰富的产地变异和 (或 )个体变异 ;其中木材密度和果实形态特征 ,产地内株间差异明显大于产地间差异。根据桤木果柄长度 ,果实大小、形状 ,木材密度 ,材色等 8个性状的产地变异 ,采用欧氏距离类平均法进行聚类分析 ,将桤木自然分布区初步划分为川西南区、川中 -西北区、川北区和鄂西 -渝东区 4个产区 ,其中 ,川西南产区自然条件优越 。Longpeduncled alder ( Alnus cremastogyne ) occurs naturally in Shichuan Basin and mountain area around the basin,ranging from 26° to 33 °N lat. and from 102° to 110 °E long. Within its natural range,topography,climatic and edaphic conditions vary greatly. Growth performances,morphological and other characters,such as peduncle length,shape and size of pseudo strobile,1000 seeds weight,basic density and colour of increment core,bole form and bark type,were investigated for 21 locations,having different environmemt conditions. Significant variations within and among stands were found. Variation components between trees within stands were greater than ones among stands for morphological characters and wood density. Rich phenotypic diversity imply that improvement potential would be attractive. According to the cluster analysis for the 8 trait means of stands (locations),the natural range of longpeduncled alder could be divided into 4 districts.

关 键 词：桤木 自然分布 区划 表型变异 果实形态 

分 类 号：S792.14[农业科学—林木遗传育种]