Intraspecific leaf trait variation in tropical agroforestry systems: a case study of shade-grown coffee

Isaac Marney E., Martin Adam R., Gagliardi Stephanie, Buchanan Serra, Van den Meersche Karel, Rapidel Bruno. 2016. Intraspecific leaf trait variation in tropical agroforestry systems: a case study of shade-grown coffee. In : Tropical ecology and society reconciliating conservation and sustainable use of biodiversity. Program and abstracts. Plinio Sist (ed.), Stéphanie Carrière (ed.), Pia Parolin (ed.), Pierre-Michel Forget (ed.). ATBC. Storrs : ATBC, p. 445. Annual Meeting of the Association for Tropical Biology and Conservation (ATBC 2016). 53, Montpellier, France, 19 Juin 2016/23 Juin 2016.

Matériel d'accompagnement : 1 poster

Résumé : Understanding plant functional traits is critical for a mechanistic understanding of agroecological processes, with increasing attention on understanding specifically the extent, causes, and consequences of within-species trait variation of cultivated crops. However, to date there are few studies that evaluate how traits vary simultaneously within any crop, across multiple interacting environmental and management-related conditions, and throughout plant development. Using coffee (Coffea arabica var. Caturra), one of the world's most important commodity crops, in Central American agroforestry systems as a case study, we present findings from multiple comparative studies that quantify patterns of intraspecific leaf trait variation across: 1) shade tree diversity gradients, 2) multiple soil fertility levels, 3) different climatic conditions, and 4) plant ontogeny. We demonstrate considerable intraspecific variation in key coffee physiological and morphological leaf traits, that! occurs across different environmental gradients and throughout plant development. Generally, patterns of bivariate and multivariate intraspecific trait variation in coffee are consistent with, but weaker than, well-documented interspecific patterns. Our research shows overwhelmingly that mean trait values (even when measured at the site or management-level) are unlikely to accurately represent the breadth of functional variation within crop species (or even cultivars). Understanding how traits covary across integrated scales of environmental variation or biological organization is critical for comprehensively quantifying intraspecific trait variation in crops and plants. In turn, research in this field is critical for i) developing new diagnostics for appropriate management of shade and other agricultural management practices, and ii) understanding how agroecological function responds to both natural and anthropogenic environmental change. (Texte intégral)

Classification Agris : F62 - Physiologie végétale - Croissance et développement
F50 - Anatomie et morphologie des plantes
F08 - Systèmes et modes de culture
K10 - Production forestière

Auteurs et affiliations

• Isaac Marney E., Université de Toronto (CAN)
• Martin Adam R., Université de Toronto (CAN)
• Gagliardi Stephanie, Université de Toronto (CAN)
• Buchanan Serra, Université de Toronto (CAN)
• Van den Meersche Karel, CIRAD-PERSYST-UMR Eco&Sols (CRI) ORCID: 0000-0002-0866-7657
• Rapidel Bruno, CIRAD-PERSYST-UMR SYSTEM (CRI) ORCID: 0000-0003-0288-5650

Source : Cirad-Agritrop (https://agritrop.cirad.fr/580637/)

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