华山松种源幼林性状变异的研究

STUDIES ON THE CHARACTER VARIATIONS OF THE JUVENILE FOREST OF PINUS ARMANDI IN PROVENANCE TESTS

华山松(Pinus armandi Franch.)分布很广,生态条件变化梯度大。对华山松种源幼林(8年生)性状变异的研究表明,种源间存在着显著差异,多数性状与产地纬度有密切的线性相关,呈纬向为主的渐变群。云贵高原种源生长快、生物产量高、针叶长、针叶着生密度小;而秦岭—大巴山区种源则与此相反。华山松各产地的极端温度是其种源变异的主导因子。

The 26 origins of Pinus armandi were used as the test materials. The inheritance and character variations of the 8 years old juvenile forest were analysed. Through the researches, we found out that there were significant differences among different provenances, and there was notable linear correlation between the majority of the characters and the latitudes in their original places. Pinus armandi shows a latitudinal decline. The provenance of Yunnan-Guizhou Plateau grows faster; its biomass yield is high and its needles are longer and are in small density. The provenance of Qinling-Dabashan Mountains is on the contrary. The leading factor of the variations is caused by the extreme temperatures of the original places of Pinus armandi.