DOI: 10.1007/s10533-015-0154-8
Scopus记录号: 2-s2.0-84948094881
论文题名: Greenhouse gas metabolism in Nordic boreal lakes
作者: Yang H. ; Andersen T. ; Dörsch P. ; Tominaga K. ; Thrane J.-E. ; Hessen D.O.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 126, 期: 2018-01-02 起始页码: 211
结束页码: 225
语种: 英语
英文关键词: Boreal lakes
; Carbon dioxide (CO2)
; Metabolism
; Methane (CH4)
; Nitrous oxide (N2O)
Scopus关键词: concentration (composition)
; flux measurement
; greenhouse gas
; lake dynamics
; photooxidation
; primary production
; Scandinavia
英文摘要: Boreal lakes are important net sources of greenhouse gases (GHGs). In this study we analyzed concentrations of CO2, CH4, N2O as well as O2, N2 and argon (Ar) from the epilimnion of 75 boreal lakes covering gradients in total organic carbon (TOC), phosphorus (P) and nitrogen (N) deposition. The Ar-corrected gas saturation deficit was used as a proxy of net metabolic changes from spring overturn to mid-summer sampling (all lakes were dimictic). Emission fluxes were calculated for CO2, CH4 and N2O based on partial pressure, water temperature and wind speed. Gas concentrations, actual and Ar-corrected, were related to lake-specific properties. TOC was the main predictor of CO2 concentrations and fluxes, followed by total P, while total P and chlorophyll a governed CH4 concentrations and fluxes. Nitrogen (NO3 − or total N) were key predictors of N2O concentrations and fluxes, followed by total P. Altitude, area and depth were not strong predictors of CO2, CH4 and N2O concentrations and fluxes, likely because only lakes with an area of >1 km2 were included. CO2 molar concentrations were negatively correlated with O2 concentrations, while the slope of CO2 concentration to Ar corrected O2 deficit was 1.039. Together with the poor correlation between area-specific primary production and CO2 as well as O2, this suggests that these gases are mostly affected by catabolic processes and probably photo-oxidation in these nutrient-poor, boreal lakes investigated in this study. Increasing inputs of TOC (i.e. lake “browning”) is likely to promote the net heterotrophy and hence emissions of all GHGs, while elevated N deposition in particular may cause elevated emissions of N2O. © 2015, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83453
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: Section for Aquatic Biology and Toxicology (AKVA), Department of Biosciences, University of Oslo, Oslo, Norway; Department of Biosciences, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, Oslo, Norway; Department of Environmental Sciences, Norwegian University of Life Sciences, Ås, Norway
Recommended Citation:
Yang H.,Andersen T.,Dörsch P.,et al. Greenhouse gas metabolism in Nordic boreal lakes[J]. Biogeochemistry,2015-01-01,126(2018-01-02)