4个岷江柏种群的球果和种子形态特征及其地理空间差异

MORPHOLOGICAL CHARACTERS AND GEOGRAPHICAL VARIATION OF CONES AND SEEDS OF FOUR CUPRESSUS CHENGGIANA S. Y. HU POPULATIONS

研究了我国四川和甘肃地区特有珍稀濒危植物岷江柏 (CupressuschenggianaS .Y .Hu)的 4个地理种群球果和种子的形态特征 ,分析了不同生境条件下岷江柏的地理差异 .结果表明 :岷江柏球果呈椭球形 ,长 (l)为 1.5～ 2 .5cm ,宽 (b)为 1.5～ 2 .0cm ,重 (m)为 1.5～ 4 .5 g,球果鳞片数为 8～ 11片 ,球果内种子粒数为 4 0～ 70粒 .在调查的 4个岷江柏种群中 ,小金县种群的球果最大、球果内种子数最多 ,马尔康县种群和金川县种群的球果重量、球果内种子数居中 ,理县种群的球果最小、球果内种子数最少 .讨论认为 ,4个种群球果和种子大小特征存在极显著差异 ,不同种群球果和种子的形态差异与岷江柏的种群遗传特征、气候特征和生境特征有着密切的关系 .图 3表 7参 2

Cupressus chenggiana S. Y. Hu is a specific and endangered plant in Sichuan and Gansu provinces of China. Of four C. chenggiana populations, the size characters of cones and seeds and geographical variation in different environments were studied. The cone of C. chenggiana is elliptical, with its length ranging from 1.5 to 2.5 cm, width from 1.5 to 2.0 cm, weight from 1.5 to 4.5 g, and squama number of cone from 8 to 11 and seed number of each cone from 40 to 70. In the four populations, the cone size and seed number are large in Xiaojin County, those in Barkam County and Jinchuan County are medium, and those in Lixian County are small. The size characters of cones and seeds of the four populations are obviously different, and the difference can be ascribed to the populations′ different genetic characters, climates and environments. Fig 3, Tab 7, Ref 25