华山松种子及其发芽习性的地理变异研究

 研究了自然分布区内6个不同种源华山松种子，发现存在显著的地理变异，并与植被地带有密切关联。温带草原地带(循化)和西部亚热带常绿阔叶林地带(会东)华山松林种子大而重，休眠性弱或不休眠；暖温带落叶阔叶林地带(蓝田)和东部亚热带常绿阔叶林地带(宜昌、江油)华山松林种子较小较轻，休眠性较强。在含油率及脂肪酸与氨基酸组成上亦存在随植被带不同而变异的情况。不论休眠深浅，冷层积(0—5℃)20天均可促进发芽。种子发芽的温度要求也因种源而异。

A STUDY ON GEOGRAPHICAL VARIATION OF SEED AND GERMINATION BEHAVIOR OF PINUS ARMANDII

Seeds of Pinus armandii, collected from 6 different provenances, were studied. The result shows significant georaphical variation strongly correlated to the vegetation zones. Seeds produced from temperate steppe zone (Xunhua, Guyuan)and western subtropical evergreen broad-leaf forest zone (Huidong) were bigger, heavier and less dormant, even non-dormant, while those from warm temperate deciduous broad-leaf forest zone (Lantian) and eastern subtropical evergreen broad-leaf forest zone (Yichang, Jiangyou) were smaller, Lighter and more dormant. Oil content, fatty acid and amino acid compositions of decoated seeds also varied with their vegetation zones. Stratification for 20 days (at 0—5℃) proved to be effective, regardless of seeds’dormancy state.