不同光照下土壤水分胁迫对长苞铁杉幼苗的作用

朱小龙; 李振基; 赖志华; 宋爱琴; 王建林; 关少华; 杨伟伟; 郑凌峰

不同光照下土壤水分胁迫对长苞铁杉幼苗的作用

Effects of water stress on Tsuga longibracteata seedlings under varied light intensity

摘要

摘要: 于2004—2005年研究了在不同光照下(100%、50%、25%、10%全日照)水分胁迫(土壤含水量30%、25%、20%、15%)处理30 d后的长苞铁杉幼苗存活率、叶片光合色素含量及比例、MDA含量、SOD活性、POD活性和Pro含量的变化.结果表明:在光照与土壤干旱协同作用对幼苗的影响方面,强光照(100%全日照)加重了干旱对幼苗的伤害,遮阴可以降低不利因素的影响;在光照与土壤过湿协同作用对幼苗的影响方面,强光照(100%全日照)和弱光照(10%全日照)加重了土壤水分过多引起的伤害,中等强度光照(50%和25%全光照)可以降低不利因素的影响;在50%和25%全日照条件下,长苞铁杉幼苗对土壤水分过多和干旱胁迫的忍耐能力较强.

Abstract: The seedling's livability,SOD activity,POD activity,content of photosynthetic pigment,MDA and Pro in the seedling leaves of Tsuga longibracteata were studied after being planted for 30 days at four different water content(30%,25%,20%,15%) under four light intensity environment(100%,50%,25%,10% full day light) from 2004 to 2005.The results showed that high light intensity(100% full day light) could enhance the injury of soil drought on seedlings of T.longibracteata,while shading could reduce it.Both high light intensity(100% full day light) and low light intensity(10% full day light) could enhance the injury of excessive soil water on the seedlings of T.longibracteata,but medium light intensity(50% and 25% full day light) could reduce it.Under medium light intensity(50% and 25% full day light) environment,the tolerance of seedlings of T.longibracteata on soil water stress was high.

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