摘要
有色溶解有机物(CDOM)是海洋碳循环的重要组成部分,其来源、组成和特性是揭示复杂的河口过程的重要依据。本文选取北方河口地区有机碳的主要贡献者,芦苇和海洋微藻,研究其生产的CDOM的吸收光谱和荧光光谱特征。结果显示,芦苇和海洋微藻CDOM吸光度随波长缩短呈指数增长,Sg值与M值之间呈对数型正相关;采用PARAFAC方法解析CDOM荧光三维谱图(EEMs),共识别出3种荧光组分:类色氨酸、类酪氨酸和类腐殖质。芦苇和海洋微藻新溶出或分泌的类酪氨酸组分,其结构基本相同;细胞破碎裂解产生的类色氨酸组分,其结构存在一定差异;类腐殖质组分来源于芦苇和海洋微藻细胞分泌物质降解或细胞破碎裂解产物。
Chromophoric Dissolved Organic Matter (CDOM) is an important part of ocean carbon cycle. Sources, composition and characterization of CDOM is of great significance to reveal the complex estuarine mixing process. To address this issue, detailed absorption and fluorescence measurements have been acquired for CDOM samples collected from reeds and marine microalgae. Results show that absorption by CDOM increases with decreased wavelength and the value of Sg is logarithmically related to the value of M by CDOM. Analysis of CDOM-EEM spectra with PARAFAC model identifies 3 kinds of flu- orescence components: tryptophan-like, tyrosine-like and humic-like. Tyrosine-like components derived from new dissolution or secretion of organic matter from reeds and marine microalgae have basically sim- ilar structure; Tryptophan-like components derived from decomposing products form burst cells between reeds and marine microalgae exist some structure differences; Humic-like components are derived from decomposing products of dissolution materials and products of burst cells.
出处
《中国海洋大学学报(自然科学版)》
CAS
CSCD
北大核心
2017年第6期25-33,共9页
Periodical of Ocean University of China
基金
国家水体污染控制与治理科技重大专项(2013ZX07202-007)
国家自然科学基金项目(41176064)资助~~
关键词
CDOM
芦苇
海洋微藻
光谱吸收
荧光特性
CDOM
reeds
marine microalgae
absorption spectra
fluorescence characterization