东海PN断面透明胞外聚合颗粒物分布特征及来源研究

The distribution and origin of transparent exopolymer particles at the PN section in the East China Sea

透明胞外聚合颗粒物(TEP)是凝聚网的重要组成部分甚至核心,在微尺度范围上形成了水环境结构的重要梯度,对于元素地球化学生物循环、碳沉降以及食物网有着举足轻重的作用。本文研究了东海典型断面PN透明胞外聚合颗粒物的分布特征及来源。结果表明:东海典型断面PN透明胞外聚合颗粒物含量介于28~376μg Xeq./L之间,平均值为(115±67)μg Xeq./L;呈现出明显的夏季>冬季>秋季>春季的季节变化特征以及近岸>外海和底层>表层的分布趋势。通过对比透明胞外聚合颗粒物分布趋势和硅藻、甲藻分布趋势以及统计分析得出,东海典型断面PN透明胞外聚合颗粒物主要来源于硅藻,甲藻贡献不大;而外海TEP的来源可能主要由超微型浮游植物贡献。

Marine transparent exopolymer particles（TEP）is the core component in marine aggregation web.It is very important for gradient structure of water environment in microscale,which plays an important role in the marine food web and biogeochemical cycle,especially on the carbon sinking processes.This article firstly reports the TEP resources and its seasonal distribution along PN section in the East China Sea.Our results show that the concentration of TEP is between 28 and 376μg Xeq./L,and the mean value was（115±67）μg Xeq./L in the East China Sea.The seasonal change of TEP is abundant in turn of in summer,winter,autumn and spring,and in surface layer is greater than bottom layer,in near shore is abundant than in open ocean.According to the distribution patterns of TEP,the diatoms and dinoflagellates,it can be concluded that the main sources of TEP in PN section of the East China Sea were mainly come from the diatoms,and in the open ocean,the TEP is major from the picophytoplankton.