DOI: 10.1029/2018JG004500
Scopus记录号: 2-s2.0-85052462780
论文题名: Organic Carbon Processing During Transport Through Boreal Inland Waters: Particles as Important Sites
作者: Attermeyer K. ; Catalán N. ; Einarsdottir K. ; Freixa A. ; Groeneveld M. ; Hawkes J.A. ; Bergquist J. ; Tranvik L.J.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 8 起始页码: 2412
结束页码: 2428
语种: 英语
英文关键词: aquatic continuum
; carbon cycling
; decay rates
; flocculation
; half-lives
; microbial degradation
英文摘要: The degradation and transformation of organic carbon (C) in inland waters result in significant CO2 emissions from inland waters. Even though most of the C in inland waters occurs as dissolved organic carbon (DOC), studies on particulate organic carbon (POC) and how it influences the overall reactivity of organic C in transport are still scarce. We sampled 30 aquatic ecosystems following an aquatic continuum including peat surface waters, streams, rivers, and lakes. We report DOC and POC degradation rates, relate degradation patterns to environmental data across these systems, and present qualitative changes in dissolved organic matter and particulate organic matter during degradation. Microbial degradation rates of POC were approximately 15 times higher compared to degradation of DOC, with POC half-lives of only 17 ± 3 (mean ± SE) days across all sampled aquatic ecosystems. Rapid POC decay was accompanied by a shift in particulate C:N ratios, whereas dissolved organic matter composition did not change at the time scale of incubations. The faster degradation of the POC implies a constant replenishment to sustain natural POC concentrations. We suggest that degradation of organic matter transported through the inland water continuum might occur to a large extent via transition of DOC into more rapidly cycling POC in nature, for example, triggered by light. In this way, particles would be a dominant pool of organic C processing across the boreal aquatic continuum, partially sustained by replenishment via flocculation of DOC. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113345
Appears in Collections: 气候减缓与适应
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作者单位: Limnology, Department of Ecology and Genetics, Uppsala University, Uppsala, Sweden; Now at WasserCluster Lunz, Lunz am See, Austria; Catalan Institute for Water Research (ICRA), Girona, Spain; Analytical Chemistry, Department of Chemistry, BMC, Uppsala University, Uppsala, Sweden
Recommended Citation:
Attermeyer K.,Catalán N.,Einarsdottir K.,et al. Organic Carbon Processing During Transport Through Boreal Inland Waters: Particles as Important Sites[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(8)