中文摘要：

根据2006年3月-2007年2月逐月对胶州湾浮游植物分粒级初级生产力的调查研究，分析了该海湾初级生产力的季节变化和空间分布、粒级结构特征以及碳流途径，计算了胶州湾浮游植物光合作用固碳量以及其对富营养化物质氮、磷的净化能力。结果表明：胶州湾的初级生产力平均为408.8mgC·m^-2d^-1，存在明显的季节差异和空间分布的不均匀性；微微型浮游植物（Picophytoplankton）对总初级生产的贡献率最高（42.14％），小型浮游植物（Microphytoplankton）和微型浮游植物（Nanophytoplankton）贡献率相当（分别为27.81％和30.03％）；浮游植物光合作用固定的碳超过50％通过微食物环再向高营养级传递并入经典食物链，微食物环在胶州湾生态系统碳循环中具有重要作用；胶州湾海域每年通过浮游植物光合作用固碳量为52809.1tC，按照Redfield比值（C：N：P=106：16：1）每年吸收N和P的量值分别为9299.7t和1287.0t，浮游植物对大气CO2的吸收及对富营养化物质的净化均具有重要作用。

英文摘要：

Based on the data monthly obtained in the Jiaozhou Bay from March 2006 to February 2007, the primary productivity of the size-fractionated phytoplankton is investigated and studied to analyze its seasonal variation and spatial distribution, the size distribution features, and the carbon flow in the bay. Also the fixed carbon amount via the phytoplankton photosysthesis and the purification capacity due to the nitrogen and phosphate intake by the phytoplankton are estimated. As the results show, the mean primary productivity is 408.8mgC·m^-2d^-1 in the Jiaozhou Bay, but the obvious seasonal and spacial variability is observed. The picophytoplankton predominates over the others （42.14% of the total）, and the nanophyto- plankton and the microphytoplankton account respectively for 30.03% and 27.81%. More than 50% of the fixed carbon from the photosysthesis is taken in by the classical food web via the microbial food loop and even the higher level. Therefore the loop plays an important role in the carbon cycle of the ecological system in the Jiaozhou Bay. The annual fixed-carbon amount via the phytoplankton photosynthesis is 52809.1 tC·a^-1 in the bay. According to the Redfield ratio, the nitrogen and phosphate intakes are equivalent to 9299.7 t·a^-1 and 1 287.0 t·a^-1 respectively, indicating the phytoplankton importance in the absorption of CO2 in the atmosphere and in the purification for the eutrophic waters.