DOI: 10.1111/gcb.12053
论文题名: CO2 fertilization and enhanced drought resistance in Greek firs from Cephalonia Island, Greece
作者: Koutavas A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 2 起始页码: 529
结束页码: 539
语种: 英语
英文关键词: Abies cephalonica
; Ainos
; Cephalonia
; CO2 fertilization
; Drought
; Greece
; Greek fir
; Growth-climate relationships
; Mediterranean
; Water-use efficiency
Scopus关键词: carbon dioxide
; coniferous tree
; dendrochronology
; drought resistance
; growth response
; precipitation (climatology)
; tree ring
; water use efficiency
; Aegean Islands
; Cephalonia [Ionian Islands]
; Greece
; Ionian Islands
; Mediterranean Region
; Abies
; Abies cephalonica
; carbon dioxide
; fertilizer
; Abies
; article
; climate
; drought
; Greece
; Abies
; Carbon Dioxide
; Climate
; Droughts
; Fertilizers
; Greece
英文摘要: Growth-climate relationships were investigated in Greek firs from Ainos Mountain on the island of Cephalonia in western Greece, using dendrochronology. The goal was to test whether tree growth is sensitive to moisture stress, whether such sensitivity has been stable through time, and whether changes in growth-moisture relationships support an influence of atmospheric CO2 on growth. Regressions of tree-ring indices (ad 1820-2007) with instrumental temperature, precipitation, and Palmer Drought Severity Index (PDSI) indicate that growth is fundamentally limited by growing-season moisture in late spring/early summer, most critically during June. However, this simple picture obscures a pattern of sharply evolving growth-climate relationships during the 20th century. Correlations between growth and June temperature, precipitation, and PDSI were significantly greater in the early 20th century but later degraded and disappeared. By the late 20th-early 21st century, there remains no statistically significant relationship between moisture and growth implying markedly enhanced resistance to drought. Moreover, growth experienced a net increase over the last half-century culminating with a sharp spike in ad 1988-1990. This recent growth acceleration is evident in the raw ring-width data prior to standardization, ruling out artifacts from statistical detrending. The vanishing relationship with moisture and parallel enhancement of growth are all the more notable because they occurred against a climatic backdrop of increasing aridity. The results are most consistent with a significant CO2 fertilization effect operating through restricted stomatal conductance and improved water-use efficiency. If this interpretation is correct, atmospheric CO2 is now overcompensating for growth declines anticipated from drier climate, suggesting its effect is unusually strong and likely to be detectable in other up-to-date tree-ring chronologies from the Mediterranean. © 2012 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62540
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Engineering Science and Physics, College of Staten Island, City University of New York, 2800 Victory Blvd, Staten Island, NY 10314, United States; Doctoral Program in Earth and Environmental Sciences, Graduate Center of the City University of New York, 365 Fifth Avenue, New York, NY, 10016, United States
Recommended Citation:
Koutavas A.. CO2 fertilization and enhanced drought resistance in Greek firs from Cephalonia Island, Greece[J]. Global Change Biology,2013-01-01,19(2)