DOI: 10.1007/s10533-017-0292-2
Scopus记录号: 2-s2.0-85010791640
论文题名: Shifts in the carbon dynamics in a tropical lowland river system (Tana River, Kenya) during flooded and non-flooded conditions
作者: Geeraert N. ; Omengo F.O. ; Borges A.V. ; Govers G. ; Bouillon S.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 132, 期: 2018-01-02 起始页码: 141
结束页码: 163
语种: 英语
英文关键词: Carbon dynamics
; Flooded conditions
; Stable carbon isotopes
; Tropical rivers
Scopus关键词: carbon budget
; carbon emission
; carbon flux
; carbon isotope
; concentration (composition)
; flooding
; flux measurement
; lowland environment
; sediment transport
; stable isotope
; suspended sediment
; tropical environment
; Kenya
; Tana River [(RVR) Kenya]
英文摘要: Rivers transport sediment and carbon (C) from the continents to the ocean, whereby the magnitude and timing of these fluxes depend on the hydrological regime. We studied the sediment and carbon dynamics of a tropical river system at two sites along the lower Tana River (Kenya), separated by a 385 km stretch characterized by extensive floodplains, to understand how the river regime affects within-river C processing as well as the C exchange between floodplain and river. Sampling took place during three different wet seasons (2012–2014), with extensive flooding during one of the campaigns. We measured the suspended sediment concentration, the concentration and stable isotope signature of three different carbon species (particulate and dissolved organic carbon, POC and DOC, and dissolved inorganic carbon, DIC) and other auxiliary parameters. During non-flooded conditions, the total C flux was dominated by POC (57–72%) and there was a downstream decrease of the total C flux. DIC was dominating during the flooded season (56–67%) and the flux of DIC and DOC coming from the inundated floodplains resulted in a downstream increase of the total carbon flux. Our data allowed us to construct a conceptual framework for the C dynamics in river systems, whereby nine major fluxes were identified. The application of this framework highlighted the dominance of POC during non-flooded conditions and the significant CO2 emissions during the flooded season. Furthermore, it identified the exchange of POC with the floodplain as an important factor to close the C budget of the river. © 2017, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83314
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 Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, Louvain, Belgium; Kenya Wildlife Service, P.O. Box 40241-00100, Nairobi, Kenya; Unité d’Océanographie Chimique, Université de Liège, Institut de Physique (B5), Liège, Belgium
Recommended Citation:
Geeraert N.,Omengo F.O.,Borges A.V.,et al. Shifts in the carbon dynamics in a tropical lowland river system (Tana River, Kenya) during flooded and non-flooded conditions[J]. Biogeochemistry,2017-01-01,132(2018-01-02)