水产学报2017，Vol.41Issue(8)：1246-1255,10.DOI:10.11964/jfc.20160310310
岛礁海藻场沉积有机物来源辨析
Identifying sources of sedimentary organic matter in the rocky reef seaweed bed
摘要
Abstract
Sedimentary organic matter (SOM) in seaweed beds provides an important material foundation for implementing seaweed bed ecosystem services. In this study, SOM samples were collected from the seaweed bed in northern Gouqi Island during the death period in July 2014, growth period in October 2014, and bloom period in May 2015, in accordance with three macroalgal life history stages: germinate and grow, mature and bloom, and decay and die. The sources and variations of the SOM were determined by carbon and nitrogen stable isotope analysis using the molar carbon-to-nitrogen (C/N) ratio and stable isotope composition (δ13C and δ15N) as indicators. The results showed the following. 1) The molar C/N ratios of the SOM varied in the ranges of 5.9-6.6, 6.0-6.9, and 5.4-6.2 in July, October, and the following May, respectively, indicating a typical marine source of SOM from the seaweed bed. 2) The δ13C values of the SOM were significantly different at the various water depths in July (-20.3‰ to -17.6‰); however, no significant changes were found in October (-22.3‰ to -21.7‰) or in May of the following year (-21.4‰ to -21.0‰). 3) The δ13C values of the SOM showed temporal variations, whereas spatial variations with water depth were found in July. 4) According to the relations among the δ13C, δ15N, and C/N, the SOM was mainly derived from the mixed contribution of phytoplankton and macroalgae in July, and it was attributed to the contribution of phytoplankton in October and the following May. 5) In July, macroalgae, on average, contributed up to 53.71% of the SOM from the seaweed bed, as estimated by the carbon stable isotope mass-balance mixing model. 6) The proportion of macroalgal detritus in the SOM was significantly affected by waves, among the various hydrodynamic factors in the marine environment.关键词
海藻场/沉积有机物/来源/贡献率Key words
seaweed bed/SOM/sources/contribution rate分类
海洋科学引用本文复制引用
吴程宏,章守宇,周曦杰,王凯,陈亮然..岛礁海藻场沉积有机物来源辨析[J].水产学报,2017,41(8):1246-1255,10.基金项目
国家自然科学基金(41176110,41406153) （41176110,41406153）
公益性行业(农业)科研专项(201303047) National Natural Science Foundation of China (41176110, 41406153) （农业）
Special Fund for Agro-Scientific Research in the Public Interest (201303047) （201303047）
