【摘要】 测定了祁连山大火烧(相对干旱环境)和吐鲁沟(相对湿润环境)中祁连圆柏(Sabina przewal-skii)幼树和老树叶片5种色素含量以及稳定碳同位素组成和脯氨酸含量等指标.结果显示:在相对干旱的环境下,幼树和老树的叶黄素循环转换率(Z+A)/(V+A+Z)、类胡萝卜素含量、脯氨酸含量及稳定碳同位素值都较高,而PsⅡ光化学效率(Fv/Fm)及叶绿素含量都较低,且花青素和紫松果黄素含量也较低;在两种不同生境下,除Fv/Fm及叶绿素外,老树的其它指标都显著高于幼树.结果说明色素在干旱胁迫下起重要的光保护作用,其变化是祁连圆柏在长期与环境交互作用过程中形成的一种适应策略.更多还原

【Abstract】 The variations of δ13C and the contents of five pigments and proline in needles of S.przewalskii from Dahuoshao(dry site)and Tulugou(wet site)in the Qilian Mountains were investigated.The needles contain more δ13C,carotenoids,xanthophyll and proline,less chlorophyll,anthocyanin,rhodoxanthin and Fv/Fm in the dry condition.Except for Fv/Fm and chlorophyll,other examined parameters of mature trees are higher than that of young trees in both environments.These results suggest that the pigments play an important role for drought-induced photo-protective function,and the S.przewalskii species can acclimate to the arid environment in a long term by changing the pigment contents.更多还原