论文部分内容阅读
在实验室构建大气CO2浓度升高的生态模拟系统,研究CO2驱动海洋酸化对大型海藻角叉菜(Chondrus ocellatus)的影响。7天实验结果显示,大气CO2浓度由正常387 mg/L左右升高至500 mg/L,促进角叉菜生长,实验系统中角叉菜生物量增加量和相对生长速率分别比对照系统的高出47.5%和47.9%;当CO2浓度升高至600 mg/L和800 mg/L,反而抑制角叉菜生长,实验期间实验系统中角叉菜生物量增加量和相对生长速率分别比对照系统的降低13.2%和13.5%(600 mg/L)、12.9%和13.3%(800 mg/L)。实验系统中,角叉菜的叶绿素a含量随CO2浓度升高逐渐降低,实验结束时叶绿素a含量分别为实验初始时的97.0%(P<0.05)(387 mg/L)、88.9%(500 mg/L)、82.9%(600 mg/L)和75.9%(800 mg/L);角叉菜的类胡萝卜素含量随CO2浓度升高逐渐增加,实验结束时类胡萝卜素含量分别为实验初始时的99.8%(P<0.05)(387 mg/L)、120.1%(500 mg/L)、131.9%(600 mg/L)和162.7%(800 mg/L)。研究表明大型红藻角叉菜通过减少合成叶绿素a以降低光合作用、增加合成类胡萝卜素以加强保护海藻细胞的方式适应海洋酸化;角叉菜生长受到大气CO2浓度升高致使海水中无机碳源增加和驱动海洋酸化正负两方面共同作用。
In the laboratory, an ecosystem simulation system was constructed to study the effects of CO2-driven ocean acidification on large-scale seaweed Chondrus ocellatus. The results of 7-day experiment showed that the atmospheric CO2 concentration increased from about 387 mg / L to 500 mg / L, which promoted the growth of carrageenan. The increment and relative growth rate of carrageenan in experimental system were higher than that of the control system 47.5% and 47.9% respectively. When CO2 concentration increased to 600 mg / L and 800 mg / L, the growth of carrageenan was inhibited. The increment and relative growth rate of carrageenan in experimental system were higher than those in control system Decreased by 13.2% and 13.5% (600 mg / L), 12.9% and 13.3% (800 mg / L), respectively. In the experimental system, the content of chlorophyll a in carrageenan decreased with the increase of CO2 concentration. At the end of the experiment, the content of chlorophyll a was 97.0% (387 mg / L) and 88.9% (500 mg /L),82.9% (600 mg / L) and 75.9% (800 mg / L) respectively. The content of carotenoids in carrageenan increased with the increase of CO2 concentration. At the end of the experiment, (100 mg / L), 99.8% (387 mg / L), 120.1% (500 mg / L), 131.9% (600 mg / L) and 162.7% (800 mg / L) Studies have shown that the large red algae carrageenan by reducing the synthesis of chlorophyll a to reduce photosynthesis and increase the synthesis of carotenoids to strengthen the protection of seaweed cells to adapt to ocean acidification; growth of carrageenan by atmospheric CO2 concentration caused by seawater inorganic carbon source Increase and drive ocean acidification positive and negative both work together.