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Long-term experimental drought combined with natural extremes accelerate vegetation shift in a Mediterranean holm oak forest
Liu, Daijun (Centre de Recerca Ecològica i Aplicacions Forestals)
Ogaya Inurrigarro, Romà (Centre de Recerca Ecològica i Aplicacions Forestals)
Barbeta i Margarit, Adrià (Centre de Recerca Ecològica i Aplicacions Forestals)
Yang, Xiaohong (Xi nan da xue (China). Key Laboratory of Horticulture Science for Southern Mountainous Regions.)
Peñuelas, Josep (Centre de Recerca Ecològica i Aplicacions Forestals)

Date: 2018
Abstract: Increasing drought combined with natural extremes are expected to accelerate forest die-off and shifts in vegetation in the Mediterranean Basin. However, fewer studies have explored these climate-driven changes in forest ecosystems. A long-term (17-year) experimental drought (−30% precipitation) was established in a Mediterranean holm oak forest with high (H) and low (L) canopies to determine the changes in stem mortality, recruitment and composition shifts. Experimental drought increased annual stem mortality rate at the community level for both H- and L-canopies. Natural drought amplified the effects of experimental drought on stem mortality at the community level and of Q. ilex for H- and L-canopies. The timescales of natural drought, however, varied substantially with canopy types and species, with shorter timescales in L- than H-canopy and for Q. ilex than P. latifolia. Furthermore, experimental drought combined with natural extremes amplified the increases in stem mortality and decreases in growth for L-canopy. Contrasting responses between Q. ilex and P. latifolia for the relative in abundance and growth were observed in L-canopy and drought treatment reinforced the vegetation shift favoring P. latifolia. These findings suggest continuous drought regimes accelerated a vegetation shift, implying potential consequences for the functions and services for water-limited forest ecosystems.
Note: Número d'acord de subvenció EC/FP7/610028
Note: Número d'acord de subvenció MINECO/CGL2016-79835-P
Note: Número d'acord de subvenció AGAUR/2014/SGR-274
Rights: Tots els drets reservats
Language: Anglès
Document: article ; recerca ; acceptedVersion
Subject: Water deficits ; Mediterranean forests ; Long-term experimental drought ; Frequent extreme droughts ; Stem-mortality rate ; Recruitment ; Vegetation shift
Published in: Environmental and experimental botany, Vol. 151 (July 2018) , p. 1-11, ISSN 0098-8472

DOI: 10.1016/j.envexpbot.2018.02.008


Available from: 2020-07-30
Post-print

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
Articles > Research articles
Articles > Published articles

 Record created 2018-04-25, last modified 2018-05-01



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