DOI: 10.1007/s10533-017-0357-2
Scopus记录号: 2-s2.0-85022193544
论文题名: Seasonal dynamics and bioavailability of dissolved organic matter in two contrasting temperate estuaries
作者: Knudsen-Leerbeck H. ; Mantikci M. ; Bentzon-Tilia M. ; Traving S.J. ; Riemann L. ; Hansen J.L.S. ; Markager S.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 134, 期: 2018-01-02 起始页码: 217
结束页码: 236
语种: 英语
英文关键词: Bioavailability
; DOC
; DON
; DOP
; Eutrophication
; Nitrogen budget
Scopus关键词: bioavailability
; biodegradation
; dissolved organic carbon
; estuarine environment
; eutrophication
; metabolism
; nitrogen cycle
; nutrient dynamics
; organic nitrogen
; organic phosphorus
; seasonality
; temperate environment
; Belt Sea
; Danish Straits
; Denmark
; Great Belt
; Roskilde Fjord
英文摘要: Production and bioavailability of dissolved organic matter (DOM) were followed during a year in the nutrient-rich estuary, Roskilde Fjord (RF), and the more oligotrophic strait, Great Belt (GB), in Denmark. Bioavailability of dissolved organic carbon (DOC), nitrogen (DON), and phosphorous (DOP) was determined during incubations over six months. Overall, RF had three to five times larger pools of total nitrogen (TN) and total phosphorous (TP) and five to eight times higher concentrations of inorganic nutrients compared to GB. However, the allocation of carbon, nitrogen, and phosphorous into different pools were remarkably similar between the two systems. DON and DOP contributed with about equal relative fractions in the two systems: 72 ± 13% of total nitrogen and 21 ± 12% of total phosphorous. The average bioavailability of DOM was 25 ± 15, 17 ± 5.5, and 49 ± 29% for carbon, nitrogen, and phosphorous, respectively. The observed release of DIN from degradation of DON amounted to between 0.1 (RF winter) and 14 times (GB summer) the loadings from land and contributed with half of the total input of bioavailable nitrogen during summer. Hence, this study shows that nitrogen in DOM is important for the nitrogen cycling, especially during summer. The sum of inorganic nutrients, particulate organic matter, and bioavailable DOM (the dynamic pools of nutrients) accounted for 42 and 92% of nitrogen, and phosphorous, respectively, and was remarkably similar between the two systems compared to the difference in nutrient richness. It is hypothesized that the pelagic metabolism of nutrients in marine systems dictates a rather uniform distribution of the different fractions of nitrogen and phosphorous containing compounds regardless of eutrophication level. © 2017, Springer International Publishing AG. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83256
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; Marine Biological Section, Department of Biology, University of Copenhagen, Helsingør, Denmark; Marine Biological Section, Department of Biology, Centre for Ocean Life, University of Copenhagen, Helsingør, Denmark; TUBİTAK Marmara Research Center, Kocaeli, Turkey
Recommended Citation:
Knudsen-Leerbeck H.,Mantikci M.,Bentzon-Tilia M.,et al. Seasonal dynamics and bioavailability of dissolved organic matter in two contrasting temperate estuaries[J]. Biogeochemistry,2017-01-01,134(2018-01-02)