中文摘要：

利用中国南极科学考察CHINARE-25/27/29航次获取的普里兹湾营养盐数据,对该海域营养盐的含量分布特征进行了分析,利用水柱T_（min）层的存在估算了夏季的营养盐消耗量（NNU、NPU和NSiU）,并对营养盐的吸收比例及结构做了初步探讨。结果显示,普里兹湾营养盐空间分布呈现明显的区域特征,上表层水营养盐浓度分布表现为冰架边缘区〈陆架区〈深海区的区域性特征。夏季普里兹湾受到浮游植物旺发的影响,湾内营养盐（NO_3-N、PO4_-P和SiO_3-Si）的消耗值相对湾外较高。营养盐吸收比值的变化表明,NSiU/NNU比值由湾内向湾外呈现升高的特征,与叶绿素a具有相反的分布趋势,推测这一现象与湾内陆架区铁的供应要高于湾外深海区有关。本文对营养盐结构与变化的探讨,将有益于进一步深入了解南极普里兹湾各生源要素的循环过程,为预测未来南极浮游群落结构的演变提供依据。

英文摘要：

Nutrient data collected in Prydz Bay during the CHINARE 25/27/29 cruises were analyzed to study the distribution pattern of nutrient concentrations. The consumption, absorption ratio, and structure of nutrients（NNU, NPU, and NSi U） in summer were evaluated based on the existence of the Tmin layer. The results showed that the spatial distributions of nutrient concentrations in the surface waters of Prydz Bay had obvious regional characteristics. The highest, intermediate, and lowest concentrations of nutrients were observed in the open sea, continental shelf, and marginal ice shelf areas, respectively. Consumption of nutrients in inner areas of Prydz Bay was higher than outer areas partly because of the influence of the phytoplankton bloom in austral summer; a period in which nutrients are absorbed by phytoplankton for photosynthesis. The NSi U/NNU ratios showed distribution patterns similar to nutrient concentrations but opposite to Chla concentration. It is speculated that this difference is mainly due to the higher supply of iron in the continental shelf region and inner Prydz Bay area comparted with the open sea. Investigation of the structure and changes of nutrient concentrations in Prydz Bay can help us better understand the biogenic element cycle processes in the Southern Ocean and provide a basis for predicting the evolution of phytoplankton structure in the Southern Ocean.