DOI: 10.1007/s10533-017-0407-9
Scopus记录号: 2-s2.0-85038079361
论文题名: Denitrification in a meromictic lake and its relevance to nitrogen flows within a moderately impacted forested catchment
作者: Nizzoli D. ; Bartoli M. ; Azzoni R. ; Longhi D. ; Castaldelli G. ; Viaroli P.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 137, 期: 2018-01-02 起始页码: 143
结束页码: 161
语种: 英语
英文关键词: Benthic fluxes
; Denitrification
; Meromixis
; NANI
; Nitrogen budget
; Nitrogen removal
Scopus关键词: ammonium
; anthropogenic source
; benthos
; climate change
; denitrification
; forested catchment
; meromictic lake
; meromixis
; nitrate
; nitrogen
; pollutant removal
; temporal variation
; zoobenthos
; Italy
英文摘要: We analysed the spatial and temporal variability of benthic nitrogen fluxes and denitrification rates in a sub-alpine meromictic lake (Lake Idro, Italy), and compared in-lake nitrogen retention and loss with the net anthropogenic nitrogen inputs to the watershed. We hypothesized a low nitrogen retention and denitrification capacity due to meromixis. This results from nitrate supply from the epilimnion slowing down during stratification and oxygen deficiency inhibiting nitrification and promoting ammonium recycling and its accumulation. We also hypothesized a steep vertical gradient of sedimentary denitrification capacity, decreasing with depth and oxygen deficiency. These are important and understudied issues in inland waters, as climate change and direct anthropic pressures may increase the extent of meromixis. Nearshore sediments had high denitrification rates (87 mg m−2 day−1) and efficiency (~ 100%), while in the monimolimnion denitrification was negligible. The littoral zone, covering 10% of the lake surface, contributed ~50% of total denitrification, while the monimolimnion, which covered 70% of the sediment surface, contributed to < 13% of total denitrification. The persistent and expanding meromixis of Lake Idro is expected to further decrease its nitrogen removal capacity (31% of the incoming nitrogen load) compared to what has been measured in other temperate lakes. Values up to 60% are generally reported for other such lakes. Results of this study are relevant as the combination of anthropogenic pressures, climate change and meromixis may threaten the nitrogen processing capacity of lakes. © 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/83187
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 Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 11/A, Parma, Italy; Klaipeda University, Klaipeda, Lithuania; Department of Life Sciences and Biotechnology, University of Ferrara, Via Luigi Borsari 46, Ferrara, Italy
Recommended Citation:
Nizzoli D.,Bartoli M.,Azzoni R.,et al. Denitrification in a meromictic lake and its relevance to nitrogen flows within a moderately impacted forested catchment[J]. Biogeochemistry,2018-01-01,137(2018-01-02)