DOI: 10.1111/gcb.12234
论文题名: Nitrogen deposition and warming - effects on phytoplankton nutrient limitation in subarctic lakes
作者: Bergström A.-K. ; Faithfull C. ; Karlsson D. ; Karlsson J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 8 起始页码: 2557
结束页码: 2568
语种: 英语
英文关键词: Atmospheric deposition
; Chlorophyll
; Growing season
; Nitrogen
; Phosphorus
; Water temperature
Scopus关键词: chlorophyll
; nitrogen
; phosphorus
; atmospheric deposition
; chlorophyll
; diffusion
; growing season
; growth rate
; lake water
; nitrogen
; nutrient limitation
; phosphorus
; phytoplankton
; subarctic region
; warming
; water temperature
; Arctic
; article
; atmospheric deposition
; biomass
; chemistry
; climate change
; greenhouse effect
; growing season
; lake
; metabolism
; physiology
; phytoplankton
; river
; season
; Sweden
; temperature
; water temperature
; atmospheric deposition
; chlorophyll
; growing season
; Nitrogen
; phosphorus
; water temperature
; Arctic Regions
; Biomass
; Climate Change
; Global Warming
; Lakes
; Nitrogen
; Phosphorus
; Phytoplankton
; Rivers
; Seasons
; Sweden
; Temperature
; Sweden
英文摘要: The aim of this study was to predict the combined effects of enhanced nitrogen (N) deposition and warming on phytoplankton development in high latitude and mountain lakes. Consequently, we assessed, in a series of enclosure experiments, how lake water nutrient stoichiometry and phytoplankton nutrient limitation varied over the growing season in 11 lakes situated along an altitudinal/climate gradient with low N-deposition (<1 kg N ha-1 yr-1) in northern subarctic Sweden. Short-term bioassay experiments with N- and P-additions revealed that phytoplankton in high-alpine lakes were more prone to P-limitation, and with decreasing altitude became increasingly N- and NP-colimited. Nutrient limitation was additionally most obvious in midsummer. There was also a strong positive correlation between phytoplankton growth and water temperature in the bioassays. Although excess nutrients were available in spring and autumn, on these occasions growth was likely constrained by low water temperatures. These results imply that enhanced N-deposition over the Swedish mountain areas will, with the exception of high-alpine lakes, enhance biomass and drive phytoplankton from N- to P-limitation. However, if not accompanied by warming, N-input from deposition will stimulate limited phytoplankton growth due to low water temperatures during large parts of the growing season. Direct effects of warming, allowing increased metabolic rates and an extension of the growing season, seem equally crucial to synergistically enhance phytoplankton development in these lakes. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62385
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Ecology and Environmental Science, Umeå University, Umeå SE-901 87, Sweden; Climate Impacts Research Centre (CIRC), Department of Ecology and Environmental Science, Umeå University, Abisko SE-981 07, Sweden
Recommended Citation:
Bergström A.-K.,Faithfull C.,Karlsson D.,et al. Nitrogen deposition and warming - effects on phytoplankton nutrient limitation in subarctic lakes[J]. Global Change Biology,2013-01-01,19(8)