成年侧柏和刺槐对春季干旱的适应策略

摘要/Abstract

摘要： 本研究以成年侧柏和刺槐为对象，分析春季干旱胁迫对叶片、根系形态和生理特性的影响，比较2树种在干旱胁迫下的适应策略。结果表明：春季干旱胁迫下，侧柏叶片脯氨酸和可溶性蛋白含量及SOD和POD活性显著低于刺槐叶片（P<0.05），可溶性糖含量和CAT活性显著高于刺槐叶片（P<0.05），两树种叶片丙二醛含量无显著差异（P>0.05）；侧柏根系脯氨酸和可溶性蛋白含量及POD和CAT活性显著低于刺槐根系（P<0.05），可溶性糖和丙二醛含量显著高于刺槐根系（P<0.05）。侧柏比叶重和根系活力显著高于刺槐（P<0.05），刺槐根长密度和根面积指数显著高于侧柏（P<0.05）。这说明春季干旱胁迫下成年侧柏和刺槐的渗透调节物质含量及抗氧化酶活性不同，春季干旱对两树种叶片伤害程度相似，而对侧柏根系伤害更大；成年侧柏主要采取耐旱策略，刺槐主要采用避旱策略。

关键词: 气象因子, 刨花楠, 径向变异, 木材特性, 生长轮年龄

Abstract: In the present study, the effects of spring drought stress on morphology and physiological characteristics of leaves and roots of mature Platycladus orientalis and Robinia pseudoacacia were analyzed and the adaptive strategies of the two tree species under drought stress were compared. The results showed that the proline and soluble protein contents, and SOD and POD activities in leaves of P. orientalis were significantly lower than those in leaves of R. pseudoacacia (P<0.05), but the soluble sugar content and CAT activity in leaves of P. orientalis were significantly higher than those in leaves of R. pseudoacacia under spring drought stress (P<0.05). Meanwhile, the difference in malondialdehyde content in leaves was not significant between P. orientalis and R. pseudoacacia (P>0.05). The proline and soluble protein contents, and POD and CAT activities in roots of P. orientalis were significantly lower than those in roots of R. pseudoacacia (P<0.05). However, the soluble sugar and malondialdehyde contents in roots of P. orientalis were significantly higher than those in roots of R. pseudoacacia (P<0.05). The specific leaf weight and root activity of P. orientalis were significantly higher than those of R. pseudoacacia (P<0.05). The root length density and root area index of R. pseudoacacia were significantly greater than those of P. orientalis(P<0.05). These results indicated that there were differences in permeating substance contents and antioxidative enzyme activities between P. orientalis and R. pseudoacacia under spring drought stress. The damages of spring drought to leaves were similar between P. orientalis and R. pseudoacacia, but the damages were more severe to the roots of P. orientalis. Adult P. orientalis mainly adopted droughttolerance strategies, while mature R. Pseudoacacia mainly adopted droughtavoidance strategies under spring drought.

Key words: growth ring age, climatic factor, radical variation, wood property, Machilus pauhoi

王凯*,赵成姣,邓杰,张莹,高爽. 成年侧柏和刺槐对春季干旱的适应策略[J]. 生态学杂志.

WANG Kai*, ZHAO Cheng-jiao, DENG Jie, ZHANG Ying, GAO Shuang. Adaptive strategies of adult Platycladus orientalis and Robinia pseudoacacia to spring drought.[J]. cje.

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成年侧柏和刺槐对春季干旱的适应策略

Adaptive strategies of adult Platycladus orientalis and Robinia pseudoacacia to spring drought.

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