中文摘要：

2004年2～3月和2004年8～9月两个航次中对珠江口及南海北部海域的异养浮游细菌生物量、生产力及其调控机制进行了观测研究．结果表明，营养物质的供应对调查区域真光层水体内的细菌生物量和生产力起着主要控制作用，从而导致冬季航次珠江口-陆架-外海调查断面表层细菌生物量和生产力呈现沿盐度梯度向外海逐渐降低的特征．就南海北部调查区域而言，冬季真光层异养细菌生物量（C）平均为（712±290）mg／m^2，夏季平均为（937±397）mg／m^2；真光层细菌生产力（C）冬季平均为（65．1±42．8）mg／（m^2·d），夏季平均（52．5±28．6）mg／（m^2·d）．本调查中，南海北部海区IBP和IPP比值范围是4％～96％，平均为26％，IBP和IPP比值与初级生产力呈负相关，其分布特征与新生产力，比的分布趋势相反，显示了异养细菌在真光层物质循环过程中所发挥的作用在南海近岸富营养海域和外海寡营养海域之间的差异．

英文摘要：

Abundance, biomass and production of bacterioplankton, primary production, new production, and the related environmental parameters were measured in the Zhujiang River Estuary and the adjacent northern South China Sea in winter and summer of 2004. The results showed that the substrate supply, including dissolved organic mater from phytoplankton and river input and inorganic nutrients, might be the most important factor governing the spatial patterns of the standing stock and production of bacterioplankton. As the results, biomass and production of bacterioplankton gradually decreased from the estuary to the shelf and open sea along the salinity gradient. IBP ： IPP ratios, ranged 4%-96%, were negatively correlated with IPP, while the spatial patterns of IBP ： IPP ratios were opposite to that of new production f-ratio. Furthermore, the spatial difference of the importance of bacterioplankton in the euphotic zone material cycle was also discussed.