DOI: 10.1111/gcb.12215
论文题名: The temporal response to drought in a Mediterranean evergreen tree: Comparing a regional precipitation gradient and a throughfall exclusion experiment
作者: Martin-Stpaul N.K. ; Limousin J.-M. ; Vogt-Schilb H. ; Rodríguez-Calcerrada J. ; Rambal S. ; Longepierre D. ; Misson L.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 8 起始页码: 2413
结束页码: 2426
语种: 英语
英文关键词: Allometry
; Carbon allocation
; Chronic stress
; Ecosystem manipulation
; Hydraulic adjustments
; Leaf ecophysiology
; Long-term drought
; Quercus ilex
; Water availability
Scopus关键词: rain
; water
; allometry
; biomass allocation
; climate change
; drought
; ecophysiology
; ecosystem response
; evergreen tree
; exclusion experiment
; forest ecosystem
; gradient analysis
; leaf area index
; Mediterranean environment
; precipitation (climatology)
; temporal variation
; throughfall
; water availability
; acclimatization
; allometry
; article
; biomass
; carbon allocation
; chronic stress
; climate change
; drought
; ecosystem manipulation
; France
; hydraulic adjustments
; leaf ecophysiology
; long-term drought
; metabolism
; oak
; photosynthesis
; physiology
; plant leaf
; Quercus ilex
; time
; water availability
; xylem
; allometry
; carbon allocation
; chronic stress
; ecosystem manipulation
; hydraulic adjustments
; leaf ecophysiology
; long-term drought
; Quercus ilex
; water availability
; Acclimatization
; Biomass
; Climate Change
; Droughts
; France
; Photosynthesis
; Plant Leaves
; Quercus
; Rain
; Time Factors
; Water
; Xylem
; Ilex
; Quercus ilex
英文摘要: Like many midlatitude ecosystems, Mediterranean forests will suffer longer and more intense droughts with the ongoing climate change. The responses to drought in long-lived trees differ depending on the time scale considered, and short-term responses are currently better understood than longer term acclimation. We assessed the temporal changes in trees facing a chronic reduction in water availability by comparing leaf-scale physiological traits, branch-scale hydraulic traits, and stand-scale biomass partitioning in the evergreen Quercus ilex across a regional precipitation gradient (long-term changes) and in a partial throughfall exclusion experiment (TEE, medium term changes). At the leaf scale, gas exchange, mass per unit area and nitrogen concentration showed homeostatic responses to drought as they did not change among the sites of the precipitation gradient or in the experimental treatments of the TEE. A similar homeostatic response was observed for the xylem vulnerability to cavitation at the branch scale. In contrast, the ratio of leaf area over sapwood area (LA/SA) in young branches exhibited a transient response to drought because it decreased in response to the TEE the first 4 years of treatment, but did not change among the sites of the gradient. At the stand scale, leaf area index (LAI) decreased, and the ratios of stem SA to LAI and of fine root area to LAI both increased in trees subjected to throughfall exclusion and from the wettest to the driest site of the gradient. Taken together, these results suggest that acclimation to chronic drought in long-lived Q. ilex is mediated by changes in hydraulic allometry that shift progressively from low (branch) to high (stand) organizational levels, and act to maintain the leaf water potential within the range of xylem hydraulic function and leaf photosynthetic assimilation. © 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/62388
Appears in Collections: 影响、适应和脆弱性
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作者单位: Centre d'Écologie Fonctionnelle et Évolutive, CNRS, 1919 Route de Mende, Montpellier 34293, France; Department of Biology, University of New Mexico, MSC03 2020, 1, Albuquerque, NM, United States; Unidad de Anatomía, Fisiología y Genética Forestal, Escuela Técnica Superior de Ingenieros de Montes, UPM, Ciudad Universitaria s/n, Madrid 28040, Spain
Recommended Citation:
Martin-Stpaul N.K.,Limousin J.-M.,Vogt-Schilb H.,et al. The temporal response to drought in a Mediterranean evergreen tree: Comparing a regional precipitation gradient and a throughfall exclusion experiment[J]. Global Change Biology,2013-01-01,19(8)