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| Titel |
A stand-alone tree demography and landscape structure module for Earth system models: integration with inventory data from temperate and boreal forests |
| VerfasserIn |
V. Haverd, B. Smith, L. P. Nieradzik, P. R. Briggs |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 15 ; Nr. 11, no. 15 (2014-08-01), S.4039-4055 |
| Datensatznummer |
250117533
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| Publikation (Nr.) |
 copernicus.org/bg-11-4039-2014.pdf |
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| Zusammenfassung |
Poorly constrained rates of biomass turnover are a key limitation of Earth
system models (ESMs). In light of this, we recently proposed a new approach
encoded in a model called Populations-Order-Physiology (POP), for the
simulation of woody ecosystem stand dynamics, demography and
disturbance-mediated heterogeneity. POP is suitable for continental to
global applications and designed for coupling to the terrestrial ecosystem
component of any ESM. POP bridges the gap between first-generation dynamic
vegetation models (DVMs) with simple large-area parameterisations of woody
biomass (typically used in current ESMs) and complex second-generation DVMs
that explicitly simulate demographic processes and landscape heterogeneity
of forests. The key simplification in the POP approach, compared with
second-generation DVMs, is to compute physiological processes such as
assimilation at grid-scale (with CABLE (Community Atmosphere Biosphere Land Exchange) or a similar land surface model), but
to partition the grid-scale biomass increment among age classes defined at
sub-grid-scale, each subject to its own dynamics. POP was successfully
demonstrated along a savanna transect in northern Australia, replicating the
effects of strong rainfall and fire disturbance gradients on observed stand
productivity and structure.
Here, we extend the application of POP to wide-ranging temporal and boreal
forests, employing paired observations of stem biomass and density from
forest inventory data to calibrate model parameters governing stand
demography and biomass evolution. The calibrated POP model is then coupled
to the CABLE land surface model, and the combined model (CABLE-POP) is
evaluated against leaf–stem allometry observations from forest stands
ranging in age from 3 to 200 year. Results indicate that simulated biomass
pools conform well with observed allometry. We conclude that POP represents
an ecologically plausible and efficient alternative to large-area
parameterisations of woody biomass turnover, typically used in current ESMs. |
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