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Eco-volume and bio-surface interplay with the universal scaling laws both in biology and in the Mata Atlantica

Janssens, Marc J. J | Mulindabigwi, Valens [autor/a] | Pohlan, Jurgen [autor/a] | Torrico, Juan Carlos [autor/a].
Tipo de material: Capítulo de libro en línea Capítulo de libro en línea Tema(s): Agricultura | Biomasa | Ecoclima | Climatología agrícola | Indicadores ambientalesTema(s) en inglés: Agriculture | Biomass | Ecoclimax | Crops and climate | Environmental indicatorsDescriptor(es) geográficos: México | Brasil Nota de acceso: Acceso en línea sin restricciones En: Seminário A Cooperação Brasil-Alemanha no Programa mata Atlântica. Teresopolis, 29 November, 3 December 2004. páginas 1-15Número de sistema: 50808Resumen:
Inglés

The applicability of a scenario or a model is mainly a matter of validation, which in turn will depend on the relevance of the interdisciplinary research hypotheses, on the one hand, and on the integrative if not interdisciplinary nature of the retained variables and/or indicators on the other hand. The notion of agro-climax is proposed as an alternative to that of eco-climax. Each agro-climax is characterised by a certain level of agro-diversity, contributing in its manmade way to biodiversity. The apparent global photosynthesis can be approximated through the measurement of litter fall, using the latter two status definitions. The above ground net primary production is close to fourfold the litter fall. The integrative indicator « eco-volume » enables to better discriminate between vegetation types and farming systems. The eco-volume contributes to supplementary precipitations of ecological origin. Finally, eco-volume is an interconnecting parameter helping validating more complex hydrological models. The ratio of eco-volume to bio-volume, tells how much eco-volume can be colonised per unit of bio-volume. To each bio-volume does correspond a bio-surface, which will regulate gaseous and caloric exchanges between bio-volume and the space encapsulated by the eco-volume. The ratio of bio-surface to ground surface is a direct measure of the vitality and the metabolic efficiency of an eco-system. The alleged universal scaling laws of biology (Enquist et al. 1999) where production and metabolic rate are believed to scale at M3/4 and whereby M is the corresponding biomass, are neglecting the metabolic expenses of the surrounding vegetal environment i.e. an eco-volume within which young plantlets are to develop at a most efficient metabolic rate. Above formula should be corrected both for bio-surface and eco-volume.

Recurso en línea: http://www.tropen.uni-bonn.de/new_website/englische_seiten/Research/Publications/docs/Janssens%20Biosurface.pdf
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Acceso en línea sin restricciones

The applicability of a scenario or a model is mainly a matter of validation, which in turn will depend on the relevance of the interdisciplinary research hypotheses, on the one hand, and on the integrative if not interdisciplinary nature of the retained variables and/or indicators on the other hand. The notion of agro-climax is proposed as an alternative to that of eco-climax. Each agro-climax is characterised by a certain level of agro-diversity, contributing in its manmade way to biodiversity. The apparent global photosynthesis can be approximated through the measurement of litter fall, using the latter two status definitions. The above ground net primary production is close to fourfold the litter fall. The integrative indicator « eco-volume » enables to better discriminate between vegetation types and farming systems. The eco-volume contributes to supplementary precipitations of ecological origin. Finally, eco-volume is an interconnecting parameter helping validating more complex hydrological models. The ratio of eco-volume to bio-volume, tells how much eco-volume can be colonised per unit of bio-volume. To each bio-volume does correspond a bio-surface, which will regulate gaseous and caloric exchanges between bio-volume and the space encapsulated by the eco-volume. The ratio of bio-surface to ground surface is a direct measure of the vitality and the metabolic efficiency of an eco-system. The alleged universal scaling laws of biology (Enquist et al. 1999) where production and metabolic rate are believed to scale at M3/4 and whereby M is the corresponding biomass, are neglecting the metabolic expenses of the surrounding vegetal environment i.e. an eco-volume within which young plantlets are to develop at a most efficient metabolic rate. Above formula should be corrected both for bio-surface and eco-volume. eng

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