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| Titel |
The Nexus Land-Use model version 1.0, an approach articulating biophysical potentials and economic dynamics to model competition for land-use |
| VerfasserIn |
F. Souty, T. Brunelle, P. Dumas, B. Dorin, P. Ciais, R. Crassous, C. Müller, A. Bondeau |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 5 ; Nr. 5, no. 5 (2012-10-19), S.1297-1322 |
| Datensatznummer |
250002854
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| Publikation (Nr.) |
 copernicus.org/gmd-5-1297-2012.pdf |
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| Zusammenfassung |
| Interactions between food demand, biomass energy and forest preservation are driving
both food prices and land-use changes, regionally and globally. This study presents
a new model called Nexus Land-Use version 1.0 which describes these interactions through a
generic representation of agricultural intensification mechanisms
within agricultural lands.
The Nexus Land-Use
model equations combine biophysics and economics into a single coherent framework to
calculate crop yields, food prices, and resulting pasture and cropland areas within
12 regions inter-connected with each other by international trade. The
representation of cropland and livestock production systems in each region relies
on three components: (i) a biomass production function derived from the crop yield
response function to inputs such as industrial fertilisers; (ii) a detailed
representation of the livestock production system subdivided into an intensive and
an extensive component, and (iii) a spatially explicit distribution of potential
(maximal) crop yields prescribed from the Lund-Postdam-Jena global vegetation model
for managed Land (LPJmL). The economic principles governing decisions about land-use
and intensification are adapted from the Ricardian rent theory, assuming cost
minimisation for farmers. In contrast to the other land-use models linking
economy and biophysics, crops are aggregated as a representative product in calories
and intensification for the representative crop is a non-linear function of chemical
inputs. The model equations and parameter values are first
described in details. Then, idealised scenarios exploring the impact of forest
preservation policies or rising energy price on agricultural intensification are
described, and their impacts on pasture and cropland areas are investigated. |
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