Changing scale in ecological modelling: A bottom up approach with an individual based vegetation model

Boulain, N; Simioni, G; Gignoux, J

Changing scale in ecological modelling: A bottom up approach with an individual based vegetation model

Boulain, N Simioni, G Gignoux, J

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Publication Type:: Journal Article
Citation:: Ecological Modelling, 2007, 203 (3-4), pp. 257 - 269
Issue Date:: 2007-05-10

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Field	Value	Language
dc.contributor.author	Boulain, N	en_US
dc.contributor.author	Simioni, G	en_US
dc.contributor.author	Gignoux, J	en_US
dc.date.issued	2007-05-10	en_US
dc.identifier.citation	Ecological Modelling, 2007, 203 (3-4), pp. 257 - 269	en_US
dc.identifier.issn	0304-3800	en_US
dc.identifier.uri	http://hdl.handle.net/10453/14754
dc.description.abstract	Net primary production (NPP) depends crucially on the sun radiation absorption, and hence its prediction on the modelling of the radiation. In heterogeneous systems such as savannas, the photosynthetically active radiation (PAR) absorption is more difficult to predict than in homogeneous systems, due to the presence of tree clumps and open grass areas. Using a detailed 3D model, we propose new formulations of PAR absorption derived from the Beer-Lambert law for heterogeneous vegetation. To account for intra-plot vegetation heterogeneity we assume an intra-plot partition of space into two or three zones, based on tree location. We develop two models derived model from the Beer-Lambert law: (1) a simple partition of space below and outside trees, (2) a partition in three zones, including the tree shading area. The only model to predict PAR interception for all types of spatial patterns was the most complex one (including tree + tree shading zone + open grass areas). In this model, extinction coefficients can be derived from vegetation structural parameters like tree cover, and tree shading area. Tree shading area could be computed from geometric site parameters (latitude, longitude, tree height). With increasing satellite resolution it can be possible to obtain these structural parameters of vegetation (cover, overlap, tree height) needed by this Beer-Lambert derived model. Such an absorption model could then be used as a basis for a Monteith-style model of vegetation functioning for heterogeneous vegetation. © 2006 Elsevier B.V. All rights reserved.	en_US
dc.relation.ispartof	Ecological Modelling	en_US
dc.relation.isbasedon	10.1016/j.ecolmodel.2006.11.024	en_US
dc.subject.classification	Ecology	en_US
dc.title	Changing scale in ecological modelling: A bottom up approach with an individual based vegetation model	en_US
dc.type	Journal Article
utslib.citation.volume	3-4	en_US
utslib.citation.volume	203	en_US
utslib.for	0599 Other Environmental Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access
pubs.issue	3-4	en_US
pubs.publication-status	Published	en_US
pubs.volume	203	en_US

Abstract:

Net primary production (NPP) depends crucially on the sun radiation absorption, and hence its prediction on the modelling of the radiation. In heterogeneous systems such as savannas, the photosynthetically active radiation (PAR) absorption is more difficult to predict than in homogeneous systems, due to the presence of tree clumps and open grass areas. Using a detailed 3D model, we propose new formulations of PAR absorption derived from the Beer-Lambert law for heterogeneous vegetation. To account for intra-plot vegetation heterogeneity we assume an intra-plot partition of space into two or three zones, based on tree location. We develop two models derived model from the Beer-Lambert law: (1) a simple partition of space below and outside trees, (2) a partition in three zones, including the tree shading area. The only model to predict PAR interception for all types of spatial patterns was the most complex one (including tree + tree shading zone + open grass areas). In this model, extinction coefficients can be derived from vegetation structural parameters like tree cover, and tree shading area. Tree shading area could be computed from geometric site parameters (latitude, longitude, tree height). With increasing satellite resolution it can be possible to obtain these structural parameters of vegetation (cover, overlap, tree height) needed by this Beer-Lambert derived model. Such an absorption model could then be used as a basis for a Monteith-style model of vegetation functioning for heterogeneous vegetation. © 2006 Elsevier B.V. All rights reserved.

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http://hdl.handle.net/10453/14754