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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Developing allometric volume-biomass equations to support fuel characterization in North-Eastern Spain. Développement d’équations allométriques volume-biomasse pour aider à la caractérisation du combustible dans le nord-est de l’Espagne
Auteurs :	Beatriz Duguy Pedra, Auteur ; Jesús Godoy Puertas, Auteur ; Laura Fuentes Lopez, Auteur
Type de document :	Article
Dans :	Ecologia Mediterranea (41(2) 2015)
Article en page(s) :	15-24
Résumé :	As a consequence of the drastic land use changes which occurred in Spain, as in other northern Mediterranean countries, throughout the 20th century, high amounts of fuels accumulated in landscapes and large fires increased in the last decades causing the degradation of ecosystems and landscapes. This trend will likely be enhanced by climatic change, which makes necessary the design at the landscape level of new fire management strategies. Fire models appear as crucial tools for supporting that task. FARSITE is a spatially-explicit fire growth and behavior model initially validated in the USA and successfully calibrated for Mediterranean conditions afterwards. The goodness of its predictions is however strongly dependent on the accuracy of the fuel-related inputs. In that sense, the description of customized fire behavior fuel models for Mediterranean plant communities is essential. When describing custom fuel models a crucial parameter is fuel load for which plant aboveground fine biomass can be considered as a proxy. The development of allometries is a rapid and nondestructive method used for estimating aboveground biomass. The main objective of this study is to establish allometric equations accurately describing the relationship between the apparent volume and aerial total biomass, as well as fine and coarse biomass fractions, for two shrub species, which are very common in dry Mediterranean shrublands of Eastern Spain: Pistacia lentiscus and Ulex parviflorus. Several volume approaches (total and canopy volume) and geometric shapes were explored for estimating the apparent volume based on field-collected dimensional variables. For a given species and a given volume approach, all shapes led to very similar volume-biomass relationships. In most cases, the apparent volume was a very good predictive variable for the aerial biomass, with r2 values generally larger than 0.7. The power-function model applied with the canopy apparent volume predicted better the total and fine biomass fractions. The smallest predictive power was observed for allometric equations predicting the U. parviflorus coarse aerial biomass, which is likely due to the small relative presence of this fraction in this species. The volume-fine biomass allometric relationships appear as suitable tools for contributing to the description of shrubland-type custom fuel models that would result in more accurate fuel model maps and more reliable fire modeling predictions.
En ligne :	https://ecologia-mediterranea.univ-avignon.fr/numeros-precedents-previous-volumes/

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