Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Changes in litter chemistry associated with global change-driven forest succession resulted in time-decoupled responses of soil carbon and nitrogen cycles
Year:2018
Research Areas
  • Earth sciences,
  • Soil science,
  • Soil analysis,
  • Soil chemistry,
  • Soil type,
  • Natural environment,
  • Climate,
  • Forest,
  • Engineering
Information
Abstract
Global change-driven forest succession may modify key soil processes with potentially important impacts over carbon (C) and nutrient cycling. We studied how changes in litter throughout the replacement of Pinus sylvestris by Quercus pyrenaica influence the structure and functioning of soil microbial communities and the capacity of soils to sequester C and retain nitrogen (N). We designed a microcosm experiment to simulate the chronological sequence from pine to oak forest conversion in Central Spain, using mixtures of senescent litter (oak leaves, pine needles and an equal mixture of needles:leaves) and soils (from pure oak, mixed and pure pine stands). We investigated changing patterns of soil C and N contents, microbial community structure (PLFA) and greenhouse gas fluxes (CO2, CH4, N2O) across the chronosequence. The succession from pine to oak forest was associated with substantial changes in microbial community structure and functioning. Soil-C sink capacity was reduced, although soil-N availability was enhanced. We further show how effects of secondary succession on the C cycle were mismatched with N dynamics in response to two chronologically decoupled facts. First, there was an acceleration in soil organic matter (SOM) turnover after microbial ?especially bacterial? growth ceased to be so intensely inhibited by needle litter (ecotone soils), resulting in lower fungal to bacterial ratios; and second, N mineralization was stimulated once pine-derived SOM was no longer present in soils (pure oak forest soils), resulting in further acceleration of SOM turnover, suppression of CH4consumption and an increase in gram-negative bacteria. Our findings suggest that different sensitivities of key mechanisms (SOM decomposition, N mineralization, CH4consumption) to factors associated with succession (e.g. recalcitrance of pine SOM and allelopathic effects over bacteria) could have significant impacts on soil microbial ecology, C and nutrient cycling.
International
Si
JCR
No
Title
Soil Biology and Biochemistry
ISBN
00380717
Impact factor JCR
4,857
Impact info
Volume
120
10.1016/j.soilbio.2018.02.013
Journal number
From page
200
To page
211
Month
SIN MES
Ranking
Participants
  • Autor: Maria Jose Fernandez Alonso (UPM)
  • Autor: Agustin Rubio Sanchez (UPM)
  • Autor: Carlos Ortiz Oñate (UPM)
Research Group, Departaments and Institutes related
  • Creador: Departamento: Sistemas y Recursos Naturales
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