海洋酸化与磷限制对颗石藻(Emiliania huxleyi)生理特征的耦合效应  

Combined effects of ocean acidification and phosphorus limitation on physiological characteristics of the coccolithophores Emiliania huxleyi

作　　者：马帅[1] 张泳 杨祥 王茵蕊 谢蓉蓉[1,2] 李家兵[1,2] 张虹[1,2] 韩永和[1,2] 张勇[1,2] Ma Shuai;Zhang Yong;Yang Xiang;Wang Yinrui;Xie Rongrong;Li Jiabing;Zhang Hong;Han Yonghe;Zhang Yong(College of Environmental and Resource Sciences·College of Carbon Neutral Modern Industry,Fujian Normal University,Fuzhou 350117,China;Fujian Key Laboratory of Pollution Control and Resource Recycling,Fujian Normal University,Fuzhou 350117,China)

机构地区：[1]福建师范大学环境与资源学院、碳中和现代产业学院,福建福州350117 [2]福建师范大学福建省污染控制与资源循环利用重点实验室,福建福州350117

出　　处：《海洋学报》2023年第8期120-129,共10页

基　　金：福建省自然科学基金面上项目(2023J01290);国家自然科学基金青年项目(41806129)。

摘　　要：颗石藻既通过光合作用合成颗粒有机碳(POC),又通过钙化作用产生颗粒无机碳(PIC),对海洋碳循环有重要贡献。虽然已有一些研究报道海洋酸化通常可增加颗石藻细胞POC含量,减少细胞PIC含量,但是这些实验结果大部分是在营养盐浓度充足条件下获得,且较少研究关注营养盐浓度限制和海洋酸化对颗石藻的耦合作用。本文研究了在无机磷浓度限制条件下,赫氏颗石藻(Emilianiahuxleyi)的主要生理指标对海洋酸化的响应特征。结果显示,海洋酸化和无机磷浓度限制协同降低了颗石藻的生长速率、相对电子传递速率和光能利用效率。无机磷浓度限制主导增加颗石藻的光合固碳量,并抵消了海洋酸化对细胞PIC含量及PIC/POC比率的负面效应。研究结果表明,无机磷浓度限制改变了颗石藻的两种固碳作用对海洋酸化的响应趋势,暗示在无机磷浓度不同的海域,颗石藻对海洋碳循环的贡献不同。Coccolithophores can produce particulate organic carbon(POC)via photosynthesis and synthesize partic-ulate inorganic carbon(PIC)via calcification;they also make an important contribution to marine carbon cycle.Some studies have reported that ocean acidification generally increases POC content and decreases PIC content of coccolithophores,however,most of the studies show these results under nutrient replete conditions,and a few stud-ies focus on the combined effects of nutrient limitation and ocean acidification on coccolithophores.In this study,we investigated the physiological responses of the coccolithophore Emiliania huxleyi to ocean acidification under dissolved inorganic phosphorus(DIP)limitation.Our data show that ocean acidification and DIP limitation act syn-ergistically to reduce growth rate,relative photosynthetic electron transport rate and light use efficiency of photo-synthetic system II of E.huxleyi.Dissolved inorganic phosphorus limitation dominantly increases cellular POC con-tent and offsets the negative effect of ocean acidification on cellular PIC content and the ratio of PIC:POC.Our results suggest that DIP limitation changed the response trends of POC and PIC contents to ocean acidification,which indicates that the contributions of coccolithophores to marine carbon cycle are different in these ocean areas with different DIP concentrations.

关 键 词：颗石藻 赫氏颗石藻 海洋酸化 磷限制 生长速率 钙化作用 光合作用 

分 类 号：P714.5[天文地球—海洋科学] Q949.2[生物学—植物学]