南海北部涠洲岛海域Merulinidae珊瑚文石骨骼和海水间微量元素分配系数:来自珊瑚种属和瑞利分馏的影响  

Distribution coefficients of trace elements between Merulinidae coral aragonite skeletons and seawater in the Weizhou Island,the northern South China Sea:Species and Rayleigh dependencies

作　　者：何湘湘 姜伟 刘凌丹 刘津 刘雨纯 余克服 He Xiangxiang;Jiang Wei;Liu Lingdan;Liu Jin;Liu Yuchun;Yu Kefu(Guangxi Laboratory on the Study of Coral Reefs in the South China Sea,School of Marine Sciences,Guangxi University,Nanning 530004,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China)

机构地区：[1]广西大学海洋学院广西南海珊瑚礁研究重点实验室,广西南宁530004 [2]南方海洋科学与工程广东省实验室(珠海),广东珠海519082

出　　处：《海洋学报》2023年第8期62-72,共11页

基　　金：国家自然科学基金(41976059,42030502,41603091);南方海洋科学与工程广东省实验室(珠海)创新团队项目(311019006,311020006);大学生创新创业训练计划(S202110593175)。

摘　　要：微量元素在珊瑚文石骨骼和海水间的分配过程是控制海水中微量元素进入珊瑚骨骼的关键环节,表征该分配过程的分配系数(KD)常用于时间序列上的海水微量元素含量重建。由于缺乏珊瑚和海水的原位研究,我们对珊瑚文石骨骼与海水之间微量元素的分配行为的了解非常有限,这严重阻碍了我们对于准确的海水化学定量数据的获取。本研究中,我们选取了南海北部涠洲岛海域的两种典型的造礁石珊瑚种(网状菊花珊瑚(Goniastrea retiformis)和八重山扁脑珊瑚(Platygyra yaeyamaensis))和周围原位表层海水中的5种微量元素(Cu、Zn、Pb、Cd和Cr)进行研究,估算了这些微量元素在珊瑚文石骨骼和海水之间的分配系数。研究结果表明:各个微量元素在网状菊花珊瑚和八重山扁脑珊瑚文石骨骼和海水间的分配系数分别为3.65和3.49(Cu);0.57和0.97(Zn);1.06和1.42(Pb);0.88和1.01(Cd);0.66和0.60(Cr)。结合前人报道的各个种属珊瑚的分配系数,我们发现不同珊瑚种属Cu、Zn、Pb和Cd的KD值存在显著差异,而Cr的KD值差异则相对较小。此外,微量元素KD值还在一定程度上受到瑞利分馏的影响,该影响与KD值的大小有关。本研究为珊瑚文石骨骼和海水间分配系数提供了较为准确的KD值,为未来的珊瑚研究提供了重要的基础数据,并扩展了我们对海洋生物成因矿物晶格的化学特征的认识。The distribution process of trace elements between coral aragonite skeletons and seawater is a key link to control the incorporating of trace elements in seawater into coral skeletons.The distribution coefficient(KD)charac-terizing this distribution process is often used to reconstruct the contents of trace elements in seawater in time series.Lacking of in situ research on corals and seawater,the limited knowledge related to the distribution behavi-or of trace elements between coral aragonite skeletons and seawater seriously hindered our acquisition of accurate chemical quantitative data on seawater.In this study we selected two typical reef-building coral species(Goni-astrea retiformis and Platygyra yaeyamaensis)and five trace elements(Cu,Zn,Pb,Cd and Cr)in the surrounding in-situ surface seawater of Weizhou Island in the northern South China Sea,and estimated the distribution coeffi-cients of these trace elements between the coral aragonite skeleton and seawater.Results revealed that the KD value of G.retiformis for Cu,Zn,Pb,Cd,Cr was 3.65,0.57,1.06,0.88,0.66 respectively;the KD value of P.yaeyamaen-sis was 3.49,0.97,1.42,1.01,0.60 respectively.We found a significant difference among different coral species in the KD values of Cu,Zn,Pb and Cd,but no significant difference for Cr.The results indicate that the KD values of trace elements are affected by the Rayleigh fractionation,which is related to the numerical values of KD.The study provided relatively accurate KD values for coral aragonite skeleton and seawater,represented important basic data for future research on coral reefs,and expanded our knowledge of chemical signature in biogenic lattices associ-ated with marine organism.

关 键 词：原位海水 瑞利分馏 微量元素 裸肋珊瑚 南海 

分 类 号：P736[天文地球—海洋地质] P595[天文地球—海洋科学] P722.7