南海中部浮游有孔虫通量的季节变化

Seasonal Variations of the Planktonic Foraminiferal Flux in the Central South China Sea

南海中部 1 993～ 1 995年连续两年的浅层和深层时间系列沉积物捕获器试验 ,揭示浮游有孔虫总通量以及Globigerinoidessacculifer,Globigerinoidesruber,Neogloboquadrinadutertrei,Globigerinitaglutinata等种的通量和相对百分数在东北季风和西南季风盛行期出现高值 ,而Globigerinabulloides,Pulleniatinaobliquiloculata和Globorotaliamenardii等种则仅在冬季东北季风盛行期出现高值 .此外 ,还发现浮游有孔虫属种的通量呈现出明显的年际变化 .

Planktonic foraminiferal fluxes have been analyzed based on the shallow and deep time-series sediment traps during 1993-1995 in the central South China Sea. In result, the total planktonic foraminiferal flux, the fluxes and relative abundances of Globigerinoides sacculifer, Globigerinoides ruber, Neogloboquadrina dutertrei, Globigerinita glutinata exhibit two prominent peaks which occur during the prevailing periods of the northeast and southwest monsoons, respectively, while those of Globigerina bulloides, Pulleniatina obliquiloculata and Globorotalia menardii have only one peak during the prevailing periods of the northeast monsoon. Besides, it was found that the fluxes of planktonic foraminiferal species exhibit obvious annual variations. Our observations indicate that these seasonal and annual variations are mainly controlled by the changes of surface primary productivity and hydrological conditions related to the East Asian monsoon.