南海西北部沉积物捕获器中颗石藻通量和属种组成变化记录  

Coccolith downward fluxes and species compositions recorded in the sediment trap in the northwest South China Sea

作　　者：冉莉华[1] Luc Beaufort 李宏亮[1] 陈建芳[1,3] Martin Wiesner 杨志[1] 张静静[1] 孙军[5] 

机构地区：[1]国家海洋局海洋生态系统与生物地球化学实验室,浙江杭州310012 [2]CEREGE,CNRS/Aix Marseille University [3]卫星海洋环境动力学国家重点实验室,浙江杭州310012 [4]Institute of Geology,University of Hamburg [5]天津科技大学海洋与环境学院,天津300457

出　　处：《海洋学报》2015年第12期11-18,共8页

基　　金：国家自然科学基金(91128212;41006034);国家海洋局第二海洋研究所基本科研业务专项资金项目(JT1401;ST1010;JG1220);"全球变化与海气相互作用"专项(GASI-03-01-03-03);教育部新世纪优秀人才计划(NCET-12-1065)

摘　　要：本文利用沉积物捕获器回收的连续时间序列沉降颗粒物样品,研究了南海西北部海南岸外陆坡外缘海域颗石藻的通量和属种组成变化及其环境意义。研究发现,东亚夏季风引起的海南岸外上升流以及冬季风导致的混合层深度增加都会刺激该区域颗石藻的生长,其中夏季上升流的影响尤为显著。从颗石粒属种组成来看,Florisphaera profunda是南海西北部中深层(1 000m)水体中主要的颗石粒优势种,此外Emiliania huxleyi,Gephyrocapsa oceanica和Gephyrocaps ericsonii等属种含量也颇高。然而在将颗石粒折算成颗石球数量后,Emiliania huxleyi则成为主要优势种。沉积物捕获器中F.profunda的相对百分含量与颗石粒总通量呈显著的负相关,表明F.profunda的相对含量与总的颗石藻生产力有着密切联系。本结果对于利用沉积物中的颗石藻记录,尤其是F.profunda相对含量变化,恢复和重建古海洋环境尤其是古海洋生产力的研究提供了直接的理论证据。Variability of coccolith downward fluxes and species compositions in sinking particles in the northwestern South China Sea was studied using continuous time-series sediment trap mooring during 2012-2013.Highest coccolith fluxes were found in summer.It was related to the southeast Monsoon induced upwelling off Hainan.Relatively high fluxes were also found in winter,probably correlated to the increased mixed layer depth induced by winter cooling and the northeast Monsoon.Florisphaera profunda was the dominant coccolith species in the sediment traps.Emiliania huxleyi,Gephyrocapsa oceanica and Gephyrocapsa ericsonii were also abundant in the sediment traps.Coccoliths were transferred to coccolithopores,and then Emiliania huxleyi instead of Florisphaera profundaturned to be the prdominant coccolithophore species in the sediment traps.A negative correlation was shown between the relative abundances of Florisphaera profundaand the coccolith fluxes.The close relationship of Florisphaera profundaand the coccolithophore productivity observed by the time-series sediment trap mooring served as a basis to use the relative abundance of Florisphaera profundaas a palaeo-productivity proxy in the palaeoceanography studies in the South China Sea.

关 键 词：颗石藻 海南岸外上升流 沉积物捕获器 Florisphaera profunda 

分 类 号：Q948.8[生物学—植物学]