Memorias de investigación
Artículos en revistas:
Disentangling the effects of tree species and microclimate on heterotrophic and autotrophic soil respiration in a Mediterranean ecotone forest
Año:2018
Áreas de investigación
  • Ciencia del suelo
Datos
Descripción
Understanding how forest ecosystems influence the response of soil respiration (RS) to climate drivers is essential to accurately predict soil carbon dioxide (CO2) fluxes in a changing environment. This is particularly crucial in areas of contact between coniferous and broadleaved forests in the Mediterranean region which are already experiencing a warmer and drier climate. We present a case study in a Mediterranean ecotone forest where RS components ?heterotrophic (RH) and autotrophic (RA)? were monitored beneath pure Scots pine (Pinus sylvestris L.) and Pyrenean oak (Quercus pyrenaica Willd.) stands using the root-trenching method. We used generalized linear models to predict the soil CO2 efflux based on interactions between soil water conent (SWC) and soil temperature. Regardless of the tree species, we found that the strong and inverse water availability and thermal seasonality of the Mediterranean climate intensely constrained soil microbial activity. The incorporation of the soil temperature-moisture covariation thus greatly improved the quality of the models compared to approaches that consider soil temperature alone. We also identified species-specific responses influencing both the total amount of RA and its sensitivity to environmental variables. Root respiration in the Scots pine stand showed greater vulnerability to the decline in SWC throughout the summer than in the oak stand. The RA in the Pyrenean oak stand was mainly limited by low soil temperatures in winter, indicating low maintenance rates during vegetative dormancy. Mean annual RH rates were highest in the Scots pine stand, probably driven by the larger litterfall rates and soil carbon (C) stocks; however, the apparent turnover rate of soil organic C in the oak stand was almost twice as fast as in the pine stand. While our observations are limited to a case study, our work shows that both soil moisture and forest composition can significantly control the temperature dependence of RS components under a Mediterranean climate.
Internacional
Si
JCR del ISI
Si
Título de la revista
Forest Ecology And Management
ISSN
0378-1127
Factor de impacto JCR
3,064
Información de impacto
Datos JCR del año 2016
Volumen
430
DOI
10.1016/j.foreco.2018.08.046
Número de revista
Desde la página
533
Hasta la página
544
Mes
SIN MES
Ranking
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Maria Jose Fernandez Alonso UPM
  • Autor: Eugenio Díaz-Pines López de los Mozos UPM
  • Autor: Carlos Ortiz Oñate UPM
  • Autor: Agustin Rubio Sanchez UPM
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Departamento: Sistemas y Recursos Naturales