DOI: 10.1111/gcb.13227
论文题名: Wood anatomy and carbon-isotope discrimination support long-term hydraulic deterioration as a major cause of drought-induced dieback
作者: Pellizzari E. ; Camarero J.J. ; Gazol A. ; Sangüesa-Barreda G. ; Carrer M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 6 起始页码: 2125
结束页码: 2137
语种: 英语
英文关键词: Abies alba
; Dendrochronology
; Dieoff
; Hydraulic conductivity
; Parenchyma
; Pinus sylvestris
; Quantitative wood anatomy
; Water-use efficiency
; Xylem
Scopus关键词: anatomy
; carbon isotope
; coniferous tree
; dendrochronology
; dieback
; drought
; hydraulic conductivity
; quantitative analysis
; water use efficiency
; wood
; xylem
; Spain
; Abies
; Abies alba
; Pinus sylvestris
; carbon
; water
; Abies
; anatomy and histology
; biological model
; drought
; physiology
; Scots pine
; season
; Spain
; statistical model
; wood
; xylem
; Abies
; Carbon Isotopes
; Droughts
; Linear Models
; Models, Biological
; Pinus sylvestris
; Seasons
; Spain
; Water
; Wood
; Xylem
英文摘要: Hydraulic impairment due to xylem embolism and carbon starvation are the two proposed mechanisms explaining drought-induced forest dieback and tree death. Here, we evaluate the relative role played by these two mechanisms in the long-term by quantifying wood-anatomical traits (tracheid size and area of parenchyma rays) and estimating the intrinsic water-use efficiency (iWUE) from carbon isotopic discrimination. We selected silver fir and Scots pine stands in NE Spain with ongoing dieback processes and compared trees showing contrasting vigour (declining vs nondeclining trees). In both species earlywood tracheids in declining trees showed smaller lumen area with thicker cell wall, inducing a lower theoretical hydraulic conductivity. Parenchyma ray area was similar between the two vigour classes. Wet spring and summer conditions promoted the formation of larger lumen areas, particularly in the case of nondeclining trees. Declining silver firs presented a lower iWUE than conspecific nondeclining trees, but the reverse pattern was observed in Scots pine. The described patterns in wood anatomical traits and iWUE are coherent with a long-lasting deterioration of the hydraulic system in declining trees prior to their dieback. Retrospective quantifications of lumen area permit to forecast dieback in declining trees 2-5 decades before growth decline started. Wood anatomical traits provide a robust tool to reconstruct the long-term capacity of trees to withstand drought-induced dieback. © 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/61385
Appears in Collections: 影响、适应和脆弱性
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作者单位: Dip. TeSAF, Universitá degli Studi di Padova, Agripolis, Legnaro, Italy; Instituto Pirenaico de Ecología (IPE-CSIC), Avda Montañana 1005, Zaragoza, Spain
Recommended Citation:
Pellizzari E.,Camarero J.J.,Gazol A.,et al. Wood anatomy and carbon-isotope discrimination support long-term hydraulic deterioration as a major cause of drought-induced dieback[J]. Global Change Biology,2016-01-01,22(6)