| Creator |
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Riggs, Robert A.
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Keane, Robert E.
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Cimon, Norm
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Cook, Rachel
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Holsinger, Lisa
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Cook, John
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DelCurto, Timothy
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Baggett, L. Scott
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Justice, Donald
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Powell, David
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Vavra, Martin
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Naylor, Bridgett
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| Abstract |
- Landscape fire succession models (LFSMs) predict spatially–explicit interactions between vegetation
succession and disturbance, but these models have yet to fully integrate ungulate herbivory as a driver of
their processes. We modified a complex LFSM, FireBGCv2, to include a multi-species herbivory module,
GrazeBGC. The system is novel in that it explicitly accommodates multiple herbivore populations, inter- and
intra-specific spatial forcing of their forage demands, and site-specific dietary selectivity to interactively modify biomass, fuels and
fire behavior across a landscape and over time. A factorial experiment with five grazing regimes, three climates and two
fire-management scenarios generated interactive influences on undergrowth biomass (shrub, herb, total), surface-fire (fire-line intensity;
flame length; scorch height; soil heat; CO, CO₂, CH₄, and PM[subscript 2.5] emissions), and the landscape’s
fire-return interval. Herbivory’s effects increased with biophysical site potential and herbivore forage demand, but
its effects were also contingent on climate and fire-suppression. Multi-species grazing modified biomass
and fire within stands and biophysical sites, but regimes involving only wildlife or livestock were less
effectual. Multi-species herbivory affected the landscape’s fire-return interval, but otherwise it did not
“scale up” to significantly modify total landscape respiration, primary production, carbon, or the total
area burned by individual fires. As modeled here, climate change and the effectiveness of future
fire suppression exerted stronger effects on landscape metabolism and carbon than did herbivory.
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| Citation |
- Riggs, R. A., Keane, R. E., Cimon, N., Cook, R., Holsinger, L., Cook, J., ... & Naylor, B. (2015). Biomass and fire dynamics in a temperate forest-grassland mosaic: Integrating multi-species herbivory, climate, and fire with the FireBGCv2/GrazeBGC system. Ecological Modelling, 296, 57-78. doi:10.1016/j.ecolmodel.2014.10.013
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| Funding Statement (additional comments about funding) |
- This work was supported by a “New Fire Science Initiative”grant from the United States Joint Fire Science Program(JFSP No.: 09-3-01-20).
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| Additional Information |
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Previous issue date: 2015-01-24
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