Resumo

HERNANDEZ-RAMOS, Adrián et al. Above-ground net primary productivity in commercial Eucalyptus urophylla S. T. Blake plantations in Huimanguillo, Tabasco, Mexico. Agrociencia [online]. 2017, vol.51, n.3, pp.343-358. ISSN 2521-9766.

The above-ground net primary productivity (ANPP) is an indicator of the plantations’ performance. The objective of this study was to estimate litterfall production and ANPP in commercial Eucalyptus urophylla S. T. Blake forest plantations in Huimanguillo, Tabasco, Mexico. The null hypothesis was that ANPP decreases as age increases. In order to estimate ANPP, we considered: 1) The annual total litterfall production (TLP), according to the information from 112 litter-traps, distributed in 1-7 years old plantations, and monthly litterfall measurements; 2) the increment in biomass per site, estimated with the initial and final biomass of 28 sampling sites (500 m2), distributed in plantations with a completely randomized experimental design. Biomass equations reported for this species were used to estimate the TLP and the biomass increment, both by component and total. ANOVA and Tukey’s multiple comparison test were applied in order to detect TLP and ANPP differences by plantation age. The plantations’ TLP average was 4.289 Mg ha-1 year-1; the highest production was achieved at 7 years-old plantation (5628 Mg ha-1 year-1). Peak litterfall was obtained from April to June (37.9 % of the annual total). The lower production matched the beginning of the rainy season (July to September). The average ANPP was 26.26 Mg ha-1 year-1, equivalent to an 84.0 % and a 16.0 % increment in biomass and litterfall, respectively. The highest production was achieved in one- and two-years plantations. Plantations show higher biomass growth in younger age.

Palavras-chave : Above-ground biomass; litterfall; biomass increment.

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