大气CO2浓度升高对鳗草植株生长的影响  

Effect of Elevated Atmospheric Concentration of CO2 on Growth of Zostera marina

作　　者：张玉[1] 许军阁 刘雨昕 周玥瑶 刘欣[1] 贺星 张沛东[1] ZHANG Yu;XU Jun-Ge;LIU Yu-Xin;ZHOU Yue-Yao;LIU Xin;HE Xing;ZHANG Pei-Dong(The Key Laboratory of Mariculture(Ocean University of China),Ministry of Education,Qingdao 266003,China)

机构地区：[1]海水养殖教育部重点实验室(中国海洋大学),山东青岛266003

出　　处：《中国海洋大学学报（自然科学版）》2020年第6期33-41,共9页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41576112);中央高校基本科研业务费专项(201822021);山东省重点研发计划项目(2017GSF217002);中国海洋大学本科生研究发展计划项目(201710423145X)资助。

摘　　要：在人工模拟大气CO2浓度升高的调节系统条件下,研究了4个不同大气CO2浓度(380×10^-6(对照组,当前大气CO2浓度)、750×10^-6(对应21世纪末大气CO2浓度)、1900×10^-6(对应23世纪末大气CO2浓度)、变化组(CO2浓度由380×10^-6逐步升高至1900×10^-6))对鳗草(Zostera marina)存活、生长、光合色素含量、过氧化物酶(POD)活力、可溶性糖含量及叶片和茎节气道面积的影响,分析了鳗草植株应对大气CO2浓度升高的生长响应和生理适应过程。研究显示,经过30 d培育实验,大气CO2浓度升高对鳗草植株的存活率(>98%)、生产力和叶片光合色素含量等指标无明显影响;大气CO2浓度升高显著提高了植株叶片延伸率和茎节直径,均在1900×10^-6时达到最大值,分别是对照组的1.4和1.1倍;随大气CO2浓度升高,鳗草植株的叶绿素a/叶绿素b、可溶性糖含量和气道面积等指标均呈现逐渐升高的趋势,在1900×10^-6时达到最大值,显著高于对照组(P<0.05)。研究结果表明,大气CO2浓度升高对鳗草植株的生长、光合作用、物质代谢和气体交换等生理过程具有促进作用,且CO2浓度越高促进作用越显著。To analyze the growth response and physiological adaptation of eelgrass(Zostera marina)to elevated atmospheric concentration of carbon dioxide(CO2),the effects of four different concentrations of elevated atmospheric CO2(380×10^-6,the control,current CO2 concentration),750×10^-6(corresponding to CO2 concentration at the end of the 21 century),1900×10^-6(corresponding to CO2 concentration at the end of the 23 century)and changing concentrations from 380×10^-6 to 1900×10^-6 gradually on the survival,growth,photosynthetic pigment content,POD activity,soluble sugar proportion and transverse airway area of leaves and internodes of eelgrass were examined under laboratory conditions in a period of 30 days.The results showed that no significant difference in survival(>98%),productivity and photosynthetic pigment content was observed among different CO2 concentrations;however the elevated concentration of CO2 significantly increased the leaf elongation rate and internode diameter.The maximum leaf elongation rate and internode diameter were obtained at 1900×10^-6,which were 1.4 times and 1.1 times higher than that of control.The ratio of Chl a/Chl b,soluble sugar proportion and transverse airway area of leaves and internodes of eelgrass gradually increased with the elevation of CO2 concentration,and maximized at 1900×10^-6.Our findings suggested that elevated atmospheric concentration of CO2 may promote the growth,photosynthesis,metabolism and gaseous exchange of Z.marina,and such promotion is more obvious with the elevation of CO2 concentration.

关 键 词：鳗草 大气CO2浓度 存活率 生长 叶片延伸率 可溶性糖 气道面积 

分 类 号：S917.3[农业科学—水产科学] Q948.8[生物学—植物学]