光照强度对广西地不容光合特性和生长的影响

蒋运生; 柴胜丰; 唐 辉<sup>*</sup>; 李 虹; 黄夕洋; 李 锋

引用本文:	蒋运生, 柴胜丰, 唐辉, 李虹, 黄夕洋, 李锋.光照强度对广西地不容光合特性和生长的影响[J].广西植物,2009,(6):792-796.[点击复制]
	JIANG Yun-Sheng, CHAI Sheng-Feng, TANG Hui, LI Hong, Huang Xi-Yang, LI Feng.Effect of different light intensities on photosynthetic characteristics and growth of Stephania kwangsiensis[J].Guihaia,2009,(6):792-796.[点击复制]

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光照强度对广西地不容光合特性和生长的影响
蒋运生, 柴胜丰, 唐辉^*, 李虹, 黄夕洋, 李锋
广西壮族自治区中国科学院广西植物研究所, 广西桂林 541006

摘要:

以盆栽当年生广西地不容为材料,研究不同光照强度(100%、50%、30%和15%自然光强)对其光合特性和生长的影响。结果表明:随着光照强度的降低,广西地不容最大净光合速率(P_max)、光饱和点(LSP)、光补偿点(LCP)先减小,而后稍有增大; 表观量子效率(AQY)在30%和50%光强下显著高于100%和15%光强处理; 叶片叶绿素总量(Chl)、叶绿素a(Chla)、叶绿素b(Chlb)、类胡萝卜素(Car)含量随光强的减弱而增大,Car/Chl随光强的减弱而减小,Chla/Chlb比值在各处理间无显著差异; 单叶面积随生长光强的减弱而增大,比叶重(LMA)则随着生长光强的减弱而减小; 30%光强下广西地不容块根生物量最高,光照过强和过弱都不利于其生物量的积累。广西地不容对光强的适应范围较广,但光照过强或过荫均对生长造成不良影响,光合速率降低,生长减缓,块根生物量积累下降,30%光强是其当年生苗生长的最佳光强。

关键词: 广西地不容光照强度光合特性生长

DOI：

分类号:Q945

基金项目:

Effect of different light intensities on photosynthetic characteristics and growth of Stephania kwangsiensis

JIANG Yun-Sheng, CHAI Sheng-Feng, TANG Hui^*, LI Hong, Huang Xi-Yang, LI Feng

Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and the Chinese Academy of Sciences, Guilin 541006, China Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and the Chinese Academy of Sciences, Guilin 541006, China

Abstract:

Potted Stephania kwangsiensis seedlings were grown under 100%,50%,30%,15% of natural light intensity. It was found that with the reducing light intensity,the maximum net photosynthetic rate(P_max),light saturation point(LSP),light compensation point(LCP)showed a trend of decrease-to-increase,and the apparent quantum yield(AQY)under 30% and 50% of light intensity were significantly higher than those under 100% and 15% of light intensity. The contents of total chlorophyll(Chl),chlorophyll a(Chla),chlorophyll b(Chlb)and carotenoid(Car)in leaves increased with decreasing light intensity,while Car/Chl decreased under low light,and Chla/Chlb had no remarkably change. As the light intensity decreased,the single leaf area increased and leaf mass per area(LMA)decreased. The root tuber biomass was the highest under 30% of light intensity. Therefore,it seemed that S.kwangsiensis had a wide range of light adaptability,but its photosynthetic rate decreased when grown in either strong or weak light intensity,resulting in inhibition of growth and biomass. 30% of light intensity was the best light environment for seedlings on the current growth season.

Key words: Stephania kwangsiensis light intensity photosynthetic characteristics growth