DOI: 10.1016/j.envpol.2020.114209
论文题名: Response strategies of boreal spruce trees to anthropogenic changes in air quality and rising pCO2
作者: Savard M.M. ; Bégin C. ; Marion J.
刊名: Environmental Pollution
ISSN: 2697491
出版年: 2020
卷: 261 语种: 英语
英文关键词: Growth rings
; Isotopes
; NOx
; SO2
; Water use efficiency
Scopus关键词: Acidification
; Air quality
; Carbon dioxide
; Deterioration
; Efficiency
; Gas emissions
; Isotopes
; Oil sands
; Anthropogenic changes
; Atmospheric emission
; Growth rings
; Intrinsic water-use efficiencies
; Quality deteriorations
; Short-term variations
; Statistical modeling
; Water use efficiency
; Forestry
; Picea
英文摘要: Little is known about how forests adjust their gas-exchange mode while atmospheric CO2 rises globally and air quality changes regionally. The present study aims at addressing this research gap for boreal spruce trees growing in three different regions of Canada, submitted to distinct levels of atmospheric emissions, by examining the amount of carbon gained per unit of water lost in trees, i.e., the intrinsic water use efficiency (iWUE). Under pristine air quality conditions, middle-to long-term trends passed from no-reaction mode to passive strategies due to atmospheric CO2, and short-term iWUE variations mostly ensue from year-to-year climatic conditions. In contrast, in trees exposed to pollutants from a copper smelter and an oil-sands mining region, air quality deterioration generated swift, long-term iWUE rises immediately at the onset of operations. In this case, the very active foliar strategy sharply reduced the intra-foliar CO2 (Ci) pressure. Statistical modeling allowed identifying emissions as the main trigger for the iWUE swift shifts; subsequent combined effects of emissions and rising CO2 led to passive foliar modes in the recent decades, and short-term variations due to climatic conditions appeared all along the series. Overall, boreal trees under different regional conditions modified their foliar strategies mostly without changing their stem growth. These findings underline the potential of acidifying emissions for prompting major iWUE increases due to lowering the stomatal apertures in leaves, and the combined influence of rising CO2 in modulating other foliar responses. A fallout of this research is that degrading air quality may create true divergences in the relationship between tree-ring isotopes and climatic conditions, an impact to consider prior to using isotopic series for paleo-climatic modeling. Gas exchange strategies of forests exposed to acidifying emissions create major divergences from responses to pCO2 and climatic conditions, a concern for modeling global C and water cycles. © 2020 Natural Resources Canada Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158127
Appears in Collections: 气候变化与战略
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作者单位: Natural Resources Canada, Geological Survey of Canada, 490 de La Couronne, Québec (QC), G1K 9A9, Canada
Recommended Citation:
Savard M.M.,Bégin C.,Marion J.. Response strategies of boreal spruce trees to anthropogenic changes in air quality and rising pCO2[J]. Environmental Pollution,2020-01-01,261