Resumo

TERAN-RAMIREZ, Mayra Atalí; RODRIGUEZ-ORTIZ, Gerardo; ENRIQUEZ-DEL VALLE, José Raymundo  e  VELASCO-VELASCO, Vicente Arturo. Aerial biomass and allometric equations in a coffee plantation in the Sierra Norte de Oaxaca. Ecosistemas y recur. agropecuarios [online]. 2018, vol.5, n.14, pp.217-226. ISSN 2007-901X.  https://doi.org/10.19136/era.a5nl4.1444.

Coffee agroforestry systems (CAFS) are of productive importance in the state of Oaxaca. In the last 20 years they have been affected by various factors that promote land-use change and thereby increase greenhouse gases. In order to analyze the structure and accumulation of aerial biomass in a CAFS and fit allometric biomass equations for Coffea arabica L., an experiment was established under a completely randomized design, under three levels of crown cover in 400 m2 experimental units in which dasometric measurements of all the trees were recorded; the data were subjected to an analysis of variance and Duncan's multiple range test (p ≤ 0.05). By means of regression, the aerial biomass equations of the coffee trees were selected. The CAFS structure is irregular; in total, 14 species were identified, with the most frequently occurring being the species Inga edulis Mart (749 trees ha-1) and Liquidambar styraciua L. (493 trees ha-1). The highest biomass accumulation was found in CAFS with mean cover level for shade trees and aerial total of 43 and 86% with 78.4 ± 29.4 and 87.02 ± 33.3 t ha-1. The biomass on the ground did not show significant differences among the cover levels evaluated. The aerial biomass compartments for C. arabica are estimated with fit coefficients between 0.71 and 0.89, where the basal diameter and height of the coffee trees are independent variables.

Palavras-chave : Crown cover; Coffea arabica L.; allometric equations; horizontal structure; vertical structure.

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