Resumo

SANCHEZ GUTIERREZ, Facundo et al. Tree structure of cocoa agroforestry system in Cárdenas, Tabasco, Mexico. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.spe14, pp.2695-2709. ISSN 2007-0934.

In this paper the floristic composition and structure and tree species diversity between cacao agroforestry systems (SAF-cacao) of different age were compared. In 20 sampling sites of 5 000 m2 each, from each tree measured diameter at breast height (DAP1.3 m) and total height (Ht); basal area (AB, m2 ha-1), importance value index (IVI), diversity indices (H') and Shannon index (E) and similarity indices were calculated. 2 856 trees were recorded, belonging to 67 species from 58 genera and 28 botanical families. The most diverse families were Fabaceae, Moraceae, Rutaceae, Sapotaceae and Verbenaceae. The 25 and 20 years SAF had the highest and lowest basal area (AB) with 22.7 and 12.16 m2 ha-1, respectively. As for IVI, Erythrina americana, Cedrela odorata, Poeppigiana erythrina, Gliricidia sepium and Colubrina arborescens, represented 53.1% of the 67 species recorded. The 35 and 6 years SAF had the highest and lowest diversity with H' values of 2.89 and 0.92, respectively. The older the SAF, were more uniform. The 18 and 38 years and between 25 and 30 years SAF-Cocoa were the most similar in tree species composition, respectively.

Palavras-chave : cacao agroforestry system; structure and tree diversity.

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