南通海门潮间带2020-2022年春、秋表层沉积硅藻组合初探  

SPRING AND AUTUMN(2020-2022)DIATOM COMPOSITION OF THE SURFACE SEDIMENTS FROM THE INTERTIDAL ZONE OF HAIMEN,NANTONG

作　　者：刘思延 李保华[1] 冉莉华 徐若闻 庞科[1] LIU Siyan;LI Baohua;RAN Lihua;XU Ruowen;PANG Ke(State Key Laboratory of Palaeobiology and Petroleum Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing210008,P.R.China;University of Chinese Academy of Sciences,Beijing 100049,P.R.China;Key Laboratory of Marine Ecosystem Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,P.R.China)

机构地区：[1]中国科学院南京地质古生物研究所,古生物学与油气地层应用重点实验室,南京210008 [2]中国科学院大学,北京100049 [3]自然资源部第二海洋研究所,海洋生态系统动力学实验室,杭州310012

出　　处：《微体古生物学报》2024年第2期174-184,共11页Acta Micropalaeontologica Sinica

基　　金：中国科学院战略性先导专项(XDB26000000);国家自然科学基金(41776073)共同资助。

摘　　要：本文利用2020-2022年春季和秋季在江苏南通海门潮间带采集的沉积物,对其中所含沉积硅藻的属种组成、丰度、分异度和优势种进行了分析,共鉴定出硅藻23属56种,大部分为广温、广布型底栖海水种。硅藻绝对丰度介于4850-7389个/克之间,复合分异度指数在2.53-3.24之间。Cyclotella stylorum,Tryblioptychus cocconeiformis和Coscinodiscus radiatus是春、秋季的共同优势种。春季特征优势种为Navicula marina,而秋季特征优势种为Coscinodiscus oculus-iridis,C.subtilis和Thalassiosira eccentrica。对比春、秋季硅藻记录我们发现,春季硅藻绝对丰度略大于秋季,可能与太阳辐射量相对较高有关;春季硅藻复合分异度指数略低于秋季,这主要是由于春季Navicula marina占了绝对优势所致。将现场得到的潮间带的春、秋季温度、盐度和营养盐数据,与硅藻代表性优势种进行相关性分析,推测温度和盐度的变化可能是影响本潮间带不同季节硅藻种类差异的主要因素。The surface sediments collected from the intertidal zone of Haimen,Nantong,Jiangsu Province during the spring-and autumn-seasons from 2020 to 2022 were utilized to study the diatom composition,abundance and diversity in this region.A total of 56 species belonging to 23 genera of the diatoms were identified,mostly comprising eurythermal and widely distributed benthic marine species.Diatom abundance ranges from 4850 to 7389 cells/g,with a composite diversity index[H(s)]between 2.53 and 3.24.Cyclotella stylorum,Tryblioptychus cocconeiformis and Coscinodiscus radiatus are the common dominant species in both spring and autumn.In spring,the characteristic dominant species is Navicula marina,while in autumn,the characteristic dominant species are Coscinodiscus oculus-iridis,C.subtilis and Thalassiosira eccentrica.Comparing the sedimentary diatom records between spring and autumn,we found that the absolute abundance of diatoms in spring is slightly greater than that in autumn,possibly due to relatively higher solar insolation levels.The H(s)of diatoms in spring is slightly lower than in autumn,mainly because Navicula marina dominates in spring.Correlation analysis was conducted between the temperature,salinity,and nutrient data obtained from the intertidal zone in spring and autumn,and the representative dominant species of diatoms.It is inferred that the variations in temperature and salinity may be the primary factors influencing the species composition of diatoms in different seasons in this intertidal zone.

关 键 词：硅藻 表层沉积物 潮间带 海门 

分 类 号：Q948.8[生物学—植物学]