四季竹对大气臭氧胁迫的光合生理响应  

Photosynthetic physio-response of Oligostachyum lubricum to atmospheric ozone stress

作　　者：李应[1,2] 陈双林[1] 李迎春[1] 庄明浩[1] 郭子武[1] 顾大形[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400 [2]贵州大学林学院,贵州贵阳550025

出　　处：《生态科学》2012年第4期390-395,共6页Ecological Science

基　　金：中央级公益性科研院所基本科研业务费专项资金(RISF6915);国家林业公益性行业科研专项(201004008);浙江省省院合作项目(2010SY01)

摘　　要：为了给全球变化背景下的竹林经营应对策略提供理论依据,运用开顶式同化箱(OTCs)模拟4个大气O3浓度,分别为环境背景大气(40～45 nl.L-1)、降低1/2(22～25 nl.L-1)、倍增1倍(92～106 nl.L-1)和倍增2倍(142～160 nl.L-1),研究分析四季竹(Oligostachyum lubricum(Wen)King f)对大气O3胁迫的光合生理响应规律。结果表明:随着大气O3浓度的升高,四季竹叶片光合色素含量呈降低趋势,倍增1倍处理的大气O3浓度是显著变化的节点;大气O3浓度变化对四季竹Pn日变化影响复杂,环境背景大气、倍增2倍处理呈"单峰"曲线,而降低1/2、倍增1倍处理呈"双峰"曲线。对Tr日变化无明显影响,各处理均呈"单峰"曲线;大气O3浓度较环境背景大气升高或降低,四季竹的光合生理响应都表现为伤害效应。当大气O3浓度倍增1倍及以上,对四季竹会造成严重的伤害,表现为叶片光合色素降解或合成受阻,水分利用效率降低,光合作用能力明显下降。大气O3胁迫对四季竹光合作用的影响表现为非气孔因素限制。In order to provide a theoretical basis tor bamboo forest management coping strategies m the context ot climate claange, we used open-top assimilation box （OTCs） to simulate four atmospheric 03 concentrations, which were the background atmosphere （40-45 nl.L-l）, the reducing 1/2（22-25 nl.L-l）, the multiplying 1 times （92-106 nl.L-1） and multiplying 2 times （142-160 nl.L-l）. We researched on the photosynthetic physio-response of Oligostachyum lubricum to atmospheric O3 stress. The results showed that with the increasing of atmospheric O3 concentration, the photosynthetic pigment content of O. lubricum leaves decreased gradually, and the atmosphericO3 concentration of multiplying 1 times was a significant change node; the change of O3 concentration had a complex effect on the diumal variations of Pn of O. lubricum. The background atmosphere and the multiplying 2 times were ＂single peak＂ curves, while the reducing 1/2 and the multiplying 1 times were ＂Twin Peaks＂ curves. To the diurnal variations of Tr, four treatments of Tr showed ＂single peak＂ curves; whether the atmospheric O3 concentration became higher or lower than the current environment, the photosynthetic physiology of O. lubricum would have a negative effect. When the O3 concentration was doubled or above of the current environment background atmosphere, it would cause severe damage to O. lubricum, with the symptoms of degradation, or blocked synthesis of leaves＇ photosynthetic pigment, and decreased water using efficiency and capacity of photosynthetic. The influence of atmospheric O3 concentration on the photosynthesis of O. lubricum performed for the stomatal limitation.

关 键 词：臭氧 四季竹 光合色素 光合日进程 

分 类 号：Q945.79[生物学—植物学]