DOI: 10.1111/gcb.13121
论文题名: Temperature-induced water stress in high-latitude forests in response to natural and anthropogenic warming
作者: Trahan M.W. ; Schubert B.A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 2 起始页码: 782
结束页码: 791
语种: 英语
英文关键词: Boreal forest
; Carbon dioxide
; Carbon isotopes
; Climate change
; Drought stress
; Global warming
; Tree-rings
; Water-use efficiency
Scopus关键词: Larix cajanderi
; air pollutant
; carbon
; carbon dioxide
; water
; air pollutant
; analysis
; chemistry
; climate change
; forest
; growth, development and aging
; history
; Larix
; physiological stress
; Russian Federation
; temperature
; Air Pollutants
; Carbon Dioxide
; Carbon Isotopes
; Climate Change
; Forests
; History, 20th Century
; Larix
; Siberia
; Stress, Physiological
; Temperature
; Water
英文摘要: The Arctic is particularly sensitive to climate change, but the independent effects of increasing atmospheric CO2 concentration (pCO2) and temperature on high-latitude forests are poorly understood. Here, we present a new, annually resolved record of stable carbon isotope (δ13C) data determined from Larix cajanderi tree cores collected from far northeastern Siberia in order to investigate the physiological response of these trees to regional warming. The tree-ring record, which extends from 1912 through 1961 (50 years), targets early twentieth-century warming (ETCW), a natural warming event in the 1920s to 1940s that was limited to Northern hemisphere high latitudes. Our data show that net carbon isotope fractionation (Δ13C), decreased by 1.7‰ across the ETCW, which is consistent with increased water stress in response to climate warming and dryer soils. To investigate whether this signal is present across the northern boreal forest, we compiled published carbon isotope data from 14 high-latitude sites within Europe, Asia, and North America. The resulting dataset covered the entire twentieth century and spanned both natural ETCW and anthropogenic Late Twentieth-Century Warming (~0.7 °C per decade). After correcting for a ~1‰ increase in Δ13C in response to twentieth century pCO2 rise, a significant negative relationship (r = -0.53, P < 0.0001) between the average, annual Δ13C values and regional annual temperature anomalies is observed, suggesting a strong control of temperature on the Δ13C value of trees growing at high latitudes. We calculate a 17% increase in intrinsic water-use efficiency within these forests across the twentieth century, of which approximately half is attributed to a decrease in stomatal conductance in order to conserve water in response to drying conditions, with the other half being attributed to increasing pCO2. We conclude that annual tree-ring records from northern high-latitude forests record the effects of climate warming and pCO2 rise across the twentieth century. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61491
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Geosciences, University of Louisiana at Lafayette, 611 McKinley St, Box 43705, Lafayette, LA, United States
Recommended Citation:
Trahan M.W.,Schubert B.A.. Temperature-induced water stress in high-latitude forests in response to natural and anthropogenic warming[J]. Global Change Biology,2016-01-01,22(2)