Descripción del proyecto
Efectos dinámicos de la biodiversidad en la biomasa y la productividad de la biomasa
En general, se considera que unos niveles elevados de biodiversidad son importantes para el funcionamiento de los ecosistemas. La cantidad de biomasa (organismos vivos en un ecosistema) y la productividad de la biomasa (la cantidad de materia orgánica por esta biomasa) tienen un papel potencialmente diversificador, pero al establecer un vínculo directo se han obtenido resultados controvertidos. En el proyecto Ambiguity, que cuenta con el apoyo de las Acciones Marie Skłodowska-Curie, se investigará esta cuestión en un nuevo marco conceptual. El equipo del proyecto considerará los componentes separados de la biomasa aérea (número de tallos, densidad de la madera y volumen medio aéreo) y los impactos separados del «efecto de selección» y el «efecto de complementariedad» para dilucidar mejor la repercusión de la biodiversidad sobre la biomasa y la productividad de la biomasa.
Objetivo
The importance of biodiversity in supporting ecosystem functioning, especially biomass productivity, has motivated numerous research questions. However, controversial results have been found so far while testing a direct link between diversity metrics and biomass, an approach that discards the fact that biomass is a composition of three other variables: number of stems, wood density and mean aboveground volume. It is only possible to access the role of diversity on biomass by separating the components of AGB, since diversity operates through different (and non-exclusive) ecological mechanisms that act separately on different AGB components: the selection effect (SE) and the complementarity effect (CE). The SE (or “sampling effect”) emerge as a result of a hyper-diverse community having a greater chance of containing particularly productive species, while the CE states that plant communities consisting of multiple species that coevolved to occupy different environmental niches can partition limited resources more efficiently, thus providing greater biomass compared to that expected from monocultures. This proposal aims at developing a new conceptual framework that will help test 1) how diversity drives variation in biomass and productivity through different ecological mechanisms acting on specific components of biomass; 2) whether historical disturbances influence the current effect of diversity on biomass and biomass productivity and; 3) whether the effect of diversity on biomass and biomass productivity differ among the Neotropics, Afrotropics and Asian tropical forests. These objectives will be achieved via i) disaggregating AGB in wood density, stem density and mean aboveground volume components and ii) separating the effect of SE and CE to assess the effects of diversity metrics on AGB components through specific indirect pathways, including effects related to variation in forest characteristics across continents and canopy packing.
Ámbito científico
- social scienceseconomics and businesseconomicsproduction economicsproductivity
- natural sciencesbiological sciencesecologyecosystems
- agricultural sciencesagricultural biotechnologybiomass
- natural sciencesearth and related environmental sciencesphysical geography
- agricultural sciencesagriculture, forestry, and fisheriesforestry
Programa(s)
- HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA) Main Programme
Régimen de financiación
HORIZON-AG-UN - HORIZON Unit GrantCoordinador
13572 Marseille
Francia