Interactive impacts of fire and vegetation dynamics on global carbon and water budget using Community Land Model version 4.5
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Published:2019-01-29
Issue:1
Volume:12
Page:457-472
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ISSN:1991-9603
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Container-title:Geoscientific Model Development
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language:en
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Short-container-title:Geosci. Model Dev.
Author:
Seo Hocheol, Kim YeonjooORCID
Abstract
Abstract. Fire plays an important role in terrestrial ecosystems. The burning of
biomass affects carbon and water fluxes and vegetation distribution. To
understand the effect of interactive processes of fire and ecological
succession on surface carbon and water fluxes, this study employed the
Community Land Model version 4.5 to conduct a series of experiments that
included and excluded fire and dynamic vegetation processes. Results of the
experiments that excluded the vegetation dynamics showed a global increase
in net ecosystem production (NEP) in post-fire regions, whereas the
inclusion of vegetation dynamics revealed a fire-induced decrease in NEP in
some regions, which was depicted when the dominant vegetation type was
changed from trees to grass. Carbon emissions from fires are enhanced by
reduction in NEP when vegetation dynamics are considered; however, this
effect is somewhat mitigated by the increase in NEP when vegetation dynamics
are not considered. Fire-induced changes in vegetation modify the soil
moisture profile because grasslands are more dominant in post-fire regions.
This results in less moisture within the top soil layer than that in
unburned regions, even though transpiration is reduced overall. These
findings are different from those of previous fire model evaluations that
ignored vegetation dynamics and thus highlight the importance of
interactive processes between fires and vegetation dynamics in evaluating
recent model developments.
Publisher
Copernicus GmbH
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