Cumulative effects of fire and drought in Mediterranean ecosystems
Abstract
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-droughtmore »
- Authors:
-
- CREAF Cerdanyola del Valles, Barcelona (Spain); CTFC, Solsona (Spain)
- CREAF Cerdanyola del Valles, Barcelona (Spain); InForest Joint Research Unit (CTFC-CEMFOR), Solsona (Spain); CSIC, Cerdanyola del Valles (Spain)
- Univ. of California, Berkeley, CA (United States)
- CREAF Cerdanyola del Valles, Barcelona (Spain); Univ. Autonoma Barcelona, Barcelona (Spain)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1479323
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Ecosphere
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 8; Journal ID: ISSN 2150-8925
- Publisher:
- Ecological Society of America
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; additive model; climatic change; compound disturbance regimes; cumulative effects; drought; ecosystem resilience; fire; Mediterranean ecosystems; regeneration traits; sequence of events
Citation Formats
Batllori, Enric, De Cáceres, Miquel, Brotons, Lluís, Ackerly, David D., Moritz, Max A., and Lloret, Francisco. Cumulative effects of fire and drought in Mediterranean ecosystems. United States: N. p., 2017.
Web. doi:10.1002/ecs2.1906.
Batllori, Enric, De Cáceres, Miquel, Brotons, Lluís, Ackerly, David D., Moritz, Max A., & Lloret, Francisco. Cumulative effects of fire and drought in Mediterranean ecosystems. United States. doi:10.1002/ecs2.1906.
Batllori, Enric, De Cáceres, Miquel, Brotons, Lluís, Ackerly, David D., Moritz, Max A., and Lloret, Francisco. Fri .
"Cumulative effects of fire and drought in Mediterranean ecosystems". United States. doi:10.1002/ecs2.1906. https://www.osti.gov/servlets/purl/1479323.
@article{osti_1479323,
title = {Cumulative effects of fire and drought in Mediterranean ecosystems},
author = {Batllori, Enric and De Cáceres, Miquel and Brotons, Lluís and Ackerly, David D. and Moritz, Max A. and Lloret, Francisco},
abstractNote = {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.},
doi = {10.1002/ecs2.1906},
journal = {Ecosphere},
number = 8,
volume = 8,
place = {United States},
year = {2017},
month = {8}
}
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