DOI: 10.1111/gcb.12269
论文题名: Dampening effects of long-term experimental drought on growth and mortality rates of a Holm oak forest
作者: Barbeta A. ; Ogaya R. ; Peñuelas J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 10 起始页码: 3133
结束页码: 3144
语种: 英语
英文关键词: Acclimation
; Arbutus unedo
; Experimental drought
; Global-change-type drought
; Holm oak
; Mediterranean forest
; Phillyrea latifolia
; Quercus ilex
; Tree growth
; Tree mortality
; Vegetation stabilizing processes
Scopus关键词: drought
; experimental study
; forest
; global change
; growth rate
; morphology
; mortality
; physiology
; rainfall
; stem
; survival
; vegetation dynamics
; Mediterranean Region
; Arbutus unedo
; Ilex
; Phillyrea latifolia
; Quercus ilex
; acclimatization
; arbutus unedo
; article
; drought
; Ericaceae
; experimental drought
; global-change-type drought
; growth, development and aging
; Holm oak
; Mediterranean forest
; oak
; Oleaceae
; phillyrea latifolia
; plant stem
; Quercus ilex
; Spain
; tree
; tree growth
; tree mortality
; vegetation stabilizing processes
; acclimation
; Arbutus unedo
; experimental drought
; global-change-type drought
; Holm oak
; Mediterranean forest
; Phillyrea latifolia
; Quercus ilex
; tree growth
; tree mortality
; vegetation stabilizing processes
; Droughts
; Ericaceae
; Oleaceae
; Plant Stems
; Quercus
; Spain
; Trees
英文摘要: Forests respond to increasing intensities and frequencies of drought by reducing growth and with higher tree mortality rates. Little is known, however, about the long-term consequences of generally drier conditions and more frequent extreme droughts. A Holm oak forest was exposed to experimental rainfall manipulation for 13 years to study the effect of increasing drought on growth and mortality of the dominant species Quercus ilex, Phillyrea latifolia, and Arbutus unedo. The drought treatment reduced stem growth of A. unedo (-66.5%) and Q. ilex (-17.5%), whereas P. latifolia remained unaffected. Higher stem mortality rates were noticeable in Q. ilex (+42.3%), but not in the other two species. Stem growth was a function of the drought index of early spring in the three species. Stem mortality rates depended on the drought index of winter and spring for Q. ilex and in spring and summer for P. latifolia, but showed no relation to climate in A. unedo. Following a long and intense drought (2005-2006), stem growth of Q. ilex and P. latifolia increased, whereas it decreased in A. unedo. Q. ilex also enhanced its survival after this period. Furthermore, the effect of drought treatment on stem growth in Q. ilex and A. unedo was attenuated as the study progressed. These results highlight the different vulnerabilities of Mediterranean species to more frequent and intense droughts, which may lead to partial species substitution and changes in forest structure and thus in carbon uptake. The response to drought, however, changed over time. Decreased intra- and interspecific competition after extreme events with high mortality, together with probable morphological and physiological acclimation to drought during the study period, may, at least in the short term, buffer forests against drier conditions. The long-term effects of drought consequently deserve more attention, because the ecosystemic responses are unlikely to be stable over time.Nontechnical summaryIn this study, we evaluate the effect of long-term (13 years) experimental drought on growth and mortality rates of three forest Mediterranean species, and their response to the different intensities and durations of natural drought. We provide evidence for species-specific responses to drought, what may eventually lead to a partial community shift favoring the more drought-resistant species. However, we also report a dampening of the treatment effect on the two drought-sensitive species, which may indicate a potential adaptation to drier conditions at the ecosystem or population level. These results are thus relevant to account for the stabilizing processes that would alter the initial response of ecosystem to drought through changes in plant physiology, morphology, and demography compensation. © 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/62321
Appears in Collections: 影响、适应和脆弱性
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作者单位: CSIC, Global Ecology Unit CREAF-CEAB-CSIC-UAB, Cerdanyola del Vallès (Catalonia), E-08193, Spain; CREAF, Cerdanyola del Vallès (Catalonia), E-08193, Spain
Recommended Citation:
Barbeta A.,Ogaya R.,Peñuelas J.. Dampening effects of long-term experimental drought on growth and mortality rates of a Holm oak forest[J]. Global Change Biology,2013-01-01,19(10)