红椿不同种源种子性状的地理变异

Geographic variation in seed traits of Toona cliata from different locations

为揭示红椿不同种源种子性状地理变异规律,对产自31个不同地区红椿种子的6个种子性状进行观察测定并分析,结果表明:种子成熟期及色泽在不同种源间存在多样性;种长、翅1长、翅2长、翅1宽、翅2宽、千粒重这6个种子性状在种源间差异均达到极显著水平;经、纬度是影响种子性状的主要因素,种子长度、宽度、千粒重呈现出由南向北、由西向东逐渐增大的规律,除千粒重外其它种子性状均与海拔呈显著或极显著负相关,千粒重与无霜期呈显著负相关,除翅2宽外其它种子性状均与年降水量呈显著正相关;根据6个种子性状数据,对红椿31个种源进行聚类,基本可划分为3大类群。

In order to investigate geographic variation in seed traits of Toona cliata, 6 seed morphologic characters were measured in 31 seed collect areas in natural distribution of China. Results show that extremely significant differences were found among different provenances in seed length, wing 1 length, wing 2 length, wing 1 width, wing 2 width and thousand seed weight. The latitude and longitude were the main factors that affected the size of seed. From southwest to northeast, the size of seed gradually increasing, There was significant negative correlation between all seed traits and elevation except thousand seed weight, The thousand seed weight was significant negative associated with frost-free period, There was significant positive correlation between all seed traits and altitude except wing 2 width. According to cluster analysis on 6 seed characters mean values including seed size and quality and geographical climatic factors, the Toona cliata from 27 natural distribution regions could be divided into 3 provenance region.