:对冲绳海槽北部 B- 3GC柱状样的 84份样品做了浮游藻类 (绝大多数是沟鞭藻孢囊 )沉积率分析。冲绳海槽约 6 790 a以前的全新世早期和 3 6 2 0～ 2 390 a B.P.两个阶段的沟鞭藻孢囊沉积率较高 ,特别是在全新世早期 ,孢囊沉积率明显高于其他阶段。沟鞭藻孢囊沉积率的变化反映了冲绳海槽北部全新世表层海水营养和生产力水平的变化 ,其趋势与黑潮影响强度的变化趋势一致。在黑潮影响甚微的全新世早期 ,表层海水富营养且高生产力 ,约6 790 a B.P.起黑潮影响强度明显加大 ,表层海水营养和生产力大幅度下降 ,只是在 3 6 2 0～ 2 390 a B.P.期间因黑潮影响强度减弱而表层海水营养和生产力有小幅度上升。黑潮对于冲绳海槽表层海水营养和生产力的影响 ,不仅因为其本身低营养、低生产力的特性 ,也由于其对来自我国大陆一侧陆源输入物的阻隔作用。 Operculodiniumcentrocarpum沉积率在剖面下段高于 Spiniferites spp.,上段则呈相反的情况 ,Spiniferites spp.沉积率较高 ,变化的转折点 (约 6 790 a B.P.)与黑潮对冲绳海槽影响强度出现骤然变化的时间吻合。所以 ,Operculodinium centrocarpum沉积率高实际上指示了偏低的表层水温 ,约 6 790 a B.P.冲绳海槽北部表层水温明显上升 : 84 samples of B-3GC columns in the northern Okinawa Trough were analyzed for sedimentation rate of planktonic algae (mostly Cyanobacteria). The Okinawa Trough had a relatively high rate of deposition of cytoplasm in the early Holocene and pre-Holocene ages of 6 790 a and 36 2 0-2 390 a BP, especially during the early Holocene. Other stages. The change of Cyanobacteria cyst deposition rate reflects the change of Holocene surface seawater nutrient and productivity in the northern Okinawa Trough, and the trend is consistent with that of Kuroshio intensity. In the early Holocene, where the Kuroshio had little effect, the surface seawater was highly eutrophic and highly productive. The intensity of the Kuroshio effect from about 6 790 BP increased significantly and the nutrient and productivity of the surface sea water significantly decreased only from 3620 to 2 During 390 a BP there was a slight increase in surface seawater nutrient and productivity due to the weaker intensity of the Kuroshio effect. The impact of the Kuroshio on the nutrient and productivity of the surface seawater in the Okinawa Trough is not only due to its low nutrient and low productivity characteristics but also its barrier to land-based inputs from the mainland China. The deposition rate of Operculodiniumcentrocarpum was higher in the lower section of the profile than that of Spiniferites spp. The upper section showed the opposite situation. The sedimentation rate of Spiniferites spp. Was higher. The changing turning point (about 6 790 a BP) Time coincides. Therefore, the high sedimentation rate of Operculodinium centrocarpum actually indicates a low surface water temperature of about 6 790 a B.P. The surface water temperature in the northern Okinawa Trough increased significantly