酸雨胁迫下黑壳楠Lindera megaphylla Hemsl．幼苗在夏季和秋季的生理生态特性  

Effects of acid rain stress on physiological characters of Lindera megaphylla Hemsl. seedlings in summer and autumn

作　　者：蒋馥蔚[1] 江洪[1,2,3] 李巍[4] 余树全[3] 鲁美娟[1] 李佳[3] 金清[3] 王艳红[3] 曹全[1] 

机构地区：[1]三峡库区生态环境教育部重点实验室／／西南大学生命科学学院,重庆400715 [2]南京大学国际地球系统科学研究所,江苏南京210093 [3]浙江林学院国际生态中心,浙江杭州311300 [4]北京师范大学环境学院,北京100875

出　　处：《生态环境》2008年第6期2374-2380,共7页Ecology and Environmnet

基　　金：科技部973项目(2005CB422207,2005CB422208);国家自然科学基金项目(40671132);科技部数据共享平台建设项目(2006DKA32300-08)

摘　　要：浙江为酸雨危害严重地区之一,而植物在酸雨胁迫下的生长和生理变化情况可以衡量其对酸雨的耐受能力,亦可作为植被引种、经营和管理的参考依据。采用盆栽法,研究了在不同季节不同强度酸雨胁迫下黑壳楠Lindera megaphylla Hemsl.的生理生态特性,设置了3个酸雨处理:重度酸雨处理(pH2.5)、中度酸雨处理(pH4.0)和酸雨对照处理(pH5.6)。研究结果表明:①酸雨、季节以及酸雨和季节的交互效应对黑壳楠的株高、地径和叶绿素相对含量没有显著影响。②黑壳楠的最大净光合速率(Amax)、表观量子效率(AQE)、光补偿点(LCP)和暗呼吸速率(Rd)对酸雨胁迫敏感,而季节并未显著影响到植物的光合特性。③酸雨胁迫显著影响黑壳楠的气孔导度(Gs)、蒸腾速率(Tr)和水分利用效率(WUE)。季节对黑壳楠的蒸腾速率(Tr)和水分利用效率(WUE)影响显著。酸雨和季节的交互效应极显著影响到植物的胞间CO2(Ci)浓度和蒸腾速率(Tr)。研究表明夏季黑石楠受酸雨胁迫的影响比秋季严重。重度酸雨胁迫严重影响到黒壳楠的生理生长,在酸雨危害严重地区如浙江不适宜大量种植黑壳楠。Effects of simulated acid rain stress on the growth and physiological characters of Lindera megaphylla Hemsl. seedlings were investigated. The aim was to know the tolerance ability of L. megaphylla to acid rain stress and it can provide reference for the transplanting and management ofL. megaphylla. The effect of acid rain stress on physiological characters ofL. megaphylla seedlings by pot method was studied. We set up three acid rain treatments： severe acid rain （pH2.5）, moderate acid rain （pH4.0）, control （pH5.6）. The results were shown as follows： （1） There were not significant differences between summer and autumn, among acid rain treatments on the parameters of plant height, ground diameter and chlorophyll content; （2） The maximum net photosynthetic rate （Amax）, apparent quantum yield （AQE）, light saturation point （LSP）, light compensation point （LCP） and dark respiration rate （Rd） were sensitive to acid rain stress. However, there were not significant differences about photosynthetic characters among seasons; （3） Acid rain stress had a significant influence on the stomatal conductance （Gs）, transpiration rate （Tr） and water use efficiency （WUE）. Otherwise the interaction effect between season and acid rain had a significant influence on the intercellular CO2 concentration （Ci） and transpiration rate （Tr）. The results showed that the effect of acid rain on plant in summer was severer than that in autumn. Severe acid rain stress had high influence on the physiology and growth of L. megaphylla seedlings, So the regions with severe acid rain disaster like Zhejiang province are unsuitable area for transplanting L. megaphylla.

关 键 词：光合 水分 生长 引种 

分 类 号：Q945.79[生物学—植物学]