Strong resilience of soil respiration components to drought-induced die-off resulting in forest secondary succession
Barba, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Curiel Yuste, Jorge (Museo Nacional de Ciencias Naturales (Madrid, Espanya))
Poyatos, Rafael (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Janssens, Ivan (Universiteit Antwerpen. Departement Biologie)
Lloret Maya, Francisco (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)

Data:	2016
Resum:	How forests cope with drought-induced perturbations and how the dependence of soil respiration on environmental and biological drivers is affected in a warming and drying context are becoming key questions. The aims of this study were to determine whether drought-induced die-off and forest succession were reflected in soil respiration and its components and to determine the influence of climate on the soil respiration components. We used the mesh exclusion method to study seasonal variations in soil respiration (R S) and its components: heterotrophic (R H) and autotrophic (R A) [further split into fine root (R R) and mycorrhizal respiration (R M)] in a mixed Mediterranean forest where Scots pine (Pinus sylvestris L. ) is undergoing a drought-induced die-off and is being replaced by holm oak (Quercus ilex L. ). Drought-induced pine die-off was not reflected in R S nor in its components, which denotes a high functional resilience of the plant and soil system to pine die-off. However, the succession from Scots pine to holm oak resulted in a reduction of R H and thus in an important decrease of total respiration (R S was 36 % lower in holm oaks than in non-defoliated pines). Furthermore, R S and all its components were strongly regulated by soil water content-and-temperature interaction. Since Scots pine die-off and Quercus species colonization seems to be widely occurring at the driest limit of the Scots pine distribution, the functional resilience of the soil system over die-off and the decrease of R S from Scots pine to holm oak could have direct consequences for the C balance of these ecosystems.
Ajuts:	Ministerio de Educación y Ciencia CGL2009-08101 Ministerio de Ciencia e Innovación CGL2010-16373 Ministerio de Ciencia e Innovación CGL2010-22180-C03-03 Ministerio de Ciencia e Innovación CGL2012-32965 Ministerio de Economía y Competitividad CGL2013-42271-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-00247 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-453
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Autotrophic respiration ; Heterotrophic respiration ; Mediterranean forest ; Partitioning fluxes ; Pinus sylvestris
Publicat a:	Oecologia, Vol. 182, issue 1 (Sep. 2016) , p. 27-41, ISSN 1432-1939

DOI: 10.1007/s00442-016-3567-8
PMID: 26879544

Post-print 35 p, 2.8 MB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
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