DOI: 10.1007/s10533-017-0403-0
Scopus记录号: 2-s2.0-85035082384
论文题名: Nutrient availability as major driver of phytoplankton-derived dissolved organic matter transformation in coastal environment
作者: Asmala E. ; Haraguchi L. ; Jakobsen H.H. ; Massicotte P. ; Carstensen J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 137, 期: 2018-01-02 起始页码: 93
结束页码: 104
语种: 英语
英文关键词: Autochthonous organic matter
; Carbon cycling
; Colored dissolved organic matter
; Extracellular release
Scopus关键词: accumulation
; autochthon
; bacterium
; bioassay
; carbon cycle
; coastal zone
; dissolved organic matter
; experiment
; nitrogen
; nutrient availability
; phosphorus
; phytoplankton
; temporal variation
; transformation
; Bacteria (microorganisms)
英文摘要: Incubation experiments were performed to examine the processing of fresh autochthonous dissolved organic matter (DOM) produced by coastal plankton communities in spring and autumn. The major driver of observed DOM dynamics was the seasonally variable inorganic nutrient status and characteristics of the initial bulk DOM, whereas the characteristics of the phytoplankton community seemed to have a minor role. Net accumulation of dissolved organic carbon (DOC) during the 18-days experiments was 3.4 and 9.2 µmol l−1 d−1 in P-limited spring and N-limited autumn, respectively. Bacterial bioassays revealed that the phytoplankton-derived DOC had surprisingly low proportions of biologically labile DOC, 12.6% (spring) and 17.5% (autumn). The optical characteristics of the DOM changed throughout the experiments, demonstrating continuous heterotrophic processing of the DOM pool. However, these temporal changes in optical characteristics of the DOM pool were not the same between seasons, indicating seasonally variable environmental drivers. Nitrogen and phosphorus availability is likely the main driver of these seasonal differences, affecting both phytoplankton extracellular release of DOM and its heterotrophic degradation by bacteria. These findings underline the complexity of the DOM production and consumption by the natural planktonic community, and show the importance of the prevailing environmental conditions regulating the DOM pathways. © 2017, Springer International Publishing AG, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83188
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Bioscience, Aarhus University, Roskilde, Denmark; Takuvik Joint International Laboratory, Université Laval & Centre National de la Recherche ScientifiqueQC, Canada; University of Helsinki, Tvärminne Zoological Station, J.A. Palménin tie 260, Hanko, Finland
Recommended Citation:
Asmala E.,Haraguchi L.,Jakobsen H.H.,et al. Nutrient availability as major driver of phytoplankton-derived dissolved organic matter transformation in coastal environment[J]. Biogeochemistry,2018-01-01,137(2018-01-02)