摘要
通过对美姑大风顶自然保护区不同海拔和不同胸径水青树（Tetracentron sinense）种子的干重、饱满度、形态特征及萌发特性进行观测，分析了海拔高度和母树大小对水青树种子生物学特性的影响。结果表明，随着海拔高度的增加，水青树种子的干重和饱满度先增加后减小，而萌发率、发芽势、活力指数和形态特征却随海拔的升高而减小；除干重外，水青树种子的其他生物学特性均与海拔之间呈极显著相关。随着胸径的增大，水青树种子的生物学特征均表现出先增加后减小的趋势。除种子的宽和厚与胸径之间具有极显著的相关性外，其他的生物学特征与胸径之间的相关性不显著。结果显示：（1）海拔是影响水青树种子生物学特性的主要生态因子之一；（2）母树大小对水青树种子的生物学特性影响较小；（3）水青树生殖期可分为四个时期，其中30-40cm径级处于生殖高峰期。
In this paper,the dry weight,plumpness,morphological characteristics and germination of Tetracentron sinense seeds collected from different altitude and DBH（ diameter at breast height） in Meigu Dafengding Nature Reserve were investigated,and the effects of altitude and DBH on the biological characteristic of T. sinense seeds were discussed. With the increase of altitude,the dry weight and plumpness of T. sinense seeds increased first and then decreased,but the germination and morphological characteristics decreased gradually. All biological characteristics showed a highly significant correlation with altitude except for dry weight. With the increase of DBH,all biological characteristics of T. sinense seeds first gradually increased and then decreased. The width and thickness of seeds were highly correlated with DBH,but others were not significant. The results showed that：（ 1） The altitude was one of the most dominating ecological factors leading to geographical variation of biological characteristics of T. sinense seeds;（ 2）The DBH has little impact on the biological characteristic of T. sinense seeds;（ 3） The reproductive period of T. sinense could be divided into four periods,and the period with the DBH of 30-40 cm maybe in reproductive peak.
出处
《植物分类与资源学报》
CAS
CSCD
北大核心
2015年第2期177-183,共7页
Plant Diversity
基金
国家自然科学基金项目"种子遗传质量是否是限制水青树种群更新的根本原因?——以美姑龙窝水青树种群为例"(31370367)
四川省教育厅自然科学重点项目"濒危植物水青树种群更新限制的影响机制研究"(12ZA169)
关键词
水青树
海拔
胸径
种子
生物学特征
Tetracentron sinense
Altitude
DBH
Seed
Biological characteristic
