硅藻介导下的钙化新途径及其对海洋生物泵的影响  

New pathway of diatom-mediated calcification and its impact on the biological pump

作　　者：潘依雯 李逸凡 陈镇东 江宗培 蔡卫君 沈蕴文 丁泽晟 陈麒先 邸雅楠 樊炜 朱陈霸 焦念志 陈鹰 Yiwen Pan;Yifan Li;Chen-Tung Arthur Chen;Zong-Pei Jiang;Wei-Jun Cai;Yunwen Shen;Zesheng Ding;Qixian Chen;Yanan Di;Wei Fan;Chenba Zhu;Nianzhi Jiao;Ying Chen(Ocean College,Zhejiang University,Zhoushan 316021,China;Department of Oceanography,Sun Yat-sen University,Kaohsiung 80424,China;School of Marine Science and Policy,University of Delaware,Newark DE 19716,USA;Carbon Neutral Innovation Research Center,Xiamen University,Xiamen 361005,China)

机构地区：[1]Ocean College,Zhejiang University,Zhoushan 316021,China [2]Department of Oceanography,Sun Yat-sen University,Kaohsiung 80424,China [3]School of Marine Science and Policy,University of Delaware,Newark DE 19716,USA [4]Carbon Neutral Innovation Research Center,Xiamen University,Xiamen 361005,China

出　　处：《Science Bulletin》2023年第21期2540-2543,M0005,共5页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(42188102,42176036,and 51120195001);the Science and Technology Program of Zhoushan City(2022C81002);the Fundamental Research Funds for the Central Universities,and the Ocean Negative Carbon Emission(ONCE)Program。

摘　　要：硅藻是海洋中最重要的初级生产者和有机碳输送者,对硅藻驱动下的生物泵过程研究已久,但至今尚未有海洋硅藻物种引发CaCO_(3)沉淀的报道.本研究发现硅藻中肋骨条藻(Skeletonema costatum)在光合作用下能够在远低于无机CaCO_(3)析出所需过饱和度下,从人工/天然海水中诱导出大量文石沉淀;并明确了中肋骨条藻介导钙化新途径的机理,即在生长过程中能在细胞表面富集[CO_(3)^(2-)]和[Ca^(2+)],形成利于CaCO_(3)成核和生长的微环境.硅藻介导下的钙化机制可以解释东海中肋骨条藻在藻华期间观测到的海水总碱度(TA)显著偏离保守混合的现象.新钙化途径建立了硅和钙循环之间的新桥梁,也为更好地理解海洋中碳循环的过程和机制,特别是在未来海洋酸化情景下,提供了颗粒无机碳泵和有机碳泵之间的新联系.Marine carbon cycling is a critical process in regulating the global carbon budget and mitigating the concentration of atmospheric carbon dioxide(CO_(2))[1].The transfer of particulate organic carbon(POC)from the surface ocean to the deep sea,known as the biological pump,is closely associated with the presence of biominerals,including biogenic silica(opal)and calcium carbonate(CaCO_(3)).CaCO_(3),as a major component of the particulate inorganic carbon(PIC)cycling in the ocean,is known to be primarily controlled by calcifying organisms such as coccolithophores and foraminifera[2,3].

关 键 词：初级生产者 海洋硅藻 天然海水 海洋酸化 过饱和度 生物泵 钙化 

分 类 号：Q178[生物学—水生生物学]