HEИндивидуална стипендия2023–2025

DivMass · The role of Diversity on tropical forest bioMass dynamics: effects of disturbance and biogeography

„Хоризонт Европа“ — Действия „Мария Склодовска-Кюри“

Период: 2023-09-01 → 2025-08-31
Финансиране от ЕС: 195 915 €
Участници: 1
Схема: HORIZON-TMA-MSCA-PF-EF

Линиите свързват координатора с партньорите.

Накратко на български

Биомасата в тропическите гори зависи от това колко плътно се застъпват короните на различните видове дървета. Разбирането на този механизъм помага да се разбере как биоразнообразието и миналите природни смущения влияят върху продуктивността на екосистемите.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

The role of Diversity on tropical forest bioMass dynamics: effects of disturbance and biogeography

The relationship between biodiversity and ecosystem functions (BEF) is a central yet debated topic in ecological research, as consistent empirical support remains contraditory. Diversity metrics are assumed to represent the amount of niche space filled due to the better partitioning of resource use between different species, thereby leading to higher overall ecosystem function. In attempts to elucidate the establishment of a causal link between biodiversity and productivity in hyper-diverse tropical forests, canopy packing (greater crown complementarity resulting in more densely packed canopies), seems to be one important yet understudied missing key. Adding to this complexity, recent findings suggest that BEF relationships are not universal, but rather context-dependent. In particular, disturbance history has been shown to disrupt the effect of biodiversity on productivity. The project main objective was to investigate whether canopy packing mediates the diversity-productivity relationships in old-growth and disturbed forest stands. A first objective of the project aimed to provide an understanding of how diversity drives variation in biomass and productivity through different ecological mechanisms acting on specific components of biomass. A second objective of the project aimed to investigate whether historical disturbances influence the current effect of diversity on biomass and biomass productivity. We expected canopy packing to be greater in tree communities composed of species that are dissimilar in terms of resource-use strategies, that spatially and functionally complementary canopies would harvest more light and use it more efficiently, leading to increased biomass gain, and that stronger canopy packing effects should be found in old-growth forests, and weaker effects in disturbed forests.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

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.

Оригинален текст от CORDIS (на английски).

Участници

INSTITUT DE RECHERCHE POUR LE DEVELOPPEMENT · MarseilleКоординаторФранция