杉木地理种源变异模式

A GEOGRAPHIC VARIATION PATTERN OF CHINESE FIR

通过对81个杉木种源生长、材性和分枝性状的研究,发现种源之间在所有7个性状上均存在显著差异。利用主分量分析和聚类分析结果,可以将81个种源分成8个不同特性的类群。典型相关的结果表明,种源的生物学性状与地理坐标(经度、纬度)紧密相关,性状具有明显的地理变异趋势。通过相关分析和趋势面分析,发现在生长性状(H_8、D_8、H_2)与地理纬度之间存在显著的负相关,与经度相关不明显;木材比重(SG) 自东向西有递减的趋势;分枝性状(NB、NW)以东经106°～112°、北纬25°～28°的区域为中心,向东西递减,向南北递增;东南部种源的冠幅似乎有较西北部种源大的趋势。杉木生长、材性和分枝性状似乎主要是以渐变群的方式变化的。

A provenance trial of Cunninghamia lanceolata Hook. at Fujian was analysed for growth, wood quality and branch traits. Highly significant differences were obtained for all the seven traits among the 81 provenances tested. All provenances were divided into eight groups with different characters according to the results of principal components analysis and cluster analysis.The results of canonical correlation analysis show that there exists significant correlation between the biological trails and geographical coordinates (longitude,and latitude), and significant geographical variation trends were obtained for traits. By correlation analysis and trend surface analysis, it was found that growth traits were signifcant negatively correlated with latitude, but not significant with longitude. There may be a tendency that specific gravity decreased from east to west. Taking the region 106~ 112 degrees longitude and 25~28 degrees north latitude as center, the values of branch traits declined with increasing or decreasing longitude and increased with increasing or decreasing latitude. The crown of the provenances in the southeast seem to be larger than in the northwest. There were general patterns ordinal variation in all traits measured.