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Title: Cumulative effects of fire and drought in Mediterranean ecosystems

Journal Article · · Ecosphere
DOI:https://doi.org/10.1002/ecs2.1906· OSTI ID:1479323
 [1];  [1];  [2];  [3];  [3];  [4]
  1. CREAF Cerdanyola del Valles, Barcelona (Spain); CTFC, Solsona (Spain)
  2. CREAF Cerdanyola del Valles, Barcelona (Spain); InForest Joint Research Unit (CTFC-CEMFOR), Solsona (Spain); CSIC, Cerdanyola del Valles (Spain)
  3. Univ. of California, Berkeley, CA (United States)
  4. CREAF Cerdanyola del Valles, Barcelona (Spain); Univ. Autonoma Barcelona, Barcelona (Spain)

Here, the occurrence of multiple disturbances can jointly affect the recovery capacity of ecosystems, potentially leading to changes in vegetation dynamics or loss of resilience. The effects of interacting disturbances on ecosystems are, however, not well understood. We use a model system based on Mediterraneantype ecosystems (MTEs) to examine how the interplay between vegetation regeneration traits and compound, stochastic disturbances modulate ecosystem dynamics. We developed a state-and-transition simulation model including two tree species with contrasting regeneration strategies (seeder vs. resprouter) and a shrubland formation. We aim to assess potential compositional switches under contrasted scenarios of compound fire-drought regimes, and to characterize the cumulative effects of fire-drought (synergism vs. antagonism) relative to the effects of individual disturbance regimes. Our simulation results indicate that interaction between moderate fire and sporadic drought recurrence-as opposed to chronic dryness-can act as a strong mechanism generating highly heterogeneous landscapes in which different regeneration types coexist, as observed in MTEs. Resprouters dominated under individual, moderate disturbance regimes of fire or drought, whereas the interaction of the two disturbances promoted the longterm coexistence of both tree regeneration strategies. However, shrubland expansion and persistence at the expanse of forests was favored by increases in drought recurrence and associated fire-drought interactions, highlighting the potential for important vegetation changes in MTEs under climate change. Overall, the cumulative effects of fire and drought can lead to distinct landscape configurations under moderate disturbance regimes that are otherwise only attained under high frequency of individual disturbances. At the ecosystem level, however, we suggest that disturbance-induced vegetation dynamics can modify vegetation sensitivity and resilience to further disturbances precluding the prevalence of synergistic effects of the two disturbances.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1479323
Journal Information:
Ecosphere, Vol. 8, Issue 8; ISSN 2150-8925
Publisher:
Ecological Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Cited By (10)

Fire-induced deforestation in drought-prone Mediterranean forests: drivers and unknowns from leaves to communities journal January 2018
Loss of potential bat habitat following a severe wildfire: a model-based rapid assessment journal January 2018
Climatic and fire determinants of early life-history stages in the Mediterranean shrub Cistus albidus journal November 2019
Compound fire‐drought regimes promote ecosystem transitions in Mediterranean ecosystems journal November 2018
A comparative assessment of plant flammability through a functional approach: The case of woody species from Argentine Chaco region: A comparative assessment of plant flammability journal August 2019
Evolutionary history of fire‐stimulated resprouting, flowering, seed release and germination journal November 2018
Increased aridity drives post‐fire recovery of Mediterranean forests towards open shrublands journal November 2019
Correspondence: Uncertainty in Climate-Vegetation Feedbacks on Fire Regimes Challenges Reliable Long-Term Projections of Burnt Area from Correlative Models journal February 2019
Increased aridity drives post‐fire recovery of Mediterranean forests towards open shrublands text January 2020
Interaction of drought and frost in tree ecophysiology: rethinking the timing of risks journal April 2021