Abstract

DURAN-BAUTISTA, Ervin Humprey; ANGEL-SANCHEZ, Yimi Katherine  and  SUAREZ-SALAZAR, Juan Carlos. DYNAMIC OF THE PHOTOSYNTHETICALLY ACTIVE RADIATION IN ARRANGEMENTS AGROFORESTALES WITH Hevea brasiliensis IN NORTHERN COLOMBIA AMAZON. rev.udcaactual.divulg.cient. [online]. 2015, vol.18, n.2, pp.365-372. ISSN 0123-4226.

Agroforestry arrangements with rubber (Hevea brasiliensis (Willd. Ex A. Juss.) Müll. Arg.), at the department of Caquetá (Colombia), with a planted area of 6017ha, are important for the rural economy. Therefore, the influence of the rubber agroforestry structure, associated with cocoa (Theobroma cacao L.) and copoazú (Theobroma grandiflorum (Willd. ex Spreng.) K. Schum.) on the distribution of the transmitted photosynthetically active radiation (fPart) in plots, located in the municipality of Morelia in the western southern region of the department was evaluated. Plots of different ages and species were selected. Sampling of the transmitted radiation in an area of 2500m² was made, and the information modeled using the statistical software R 3.1.2, through the akima package. For the agroforestry structure the Sexi FS simulator was employed. The results revealed an effect of plots age on the transmitted radiation (p <0.0001), as well as an irregular distribution of the individuals within the arrangement. As consequence, the fPARt is not homogeneously distributed, generating areas where the transmitted radiation is high and others where it is low. This raises the need to improve the management and distribution of species within agroforestry arrangements with rubber, to make them more efficient in the use and distribution of radiation

Keywords : Shade; spatial distribution; canopy; natural rubber.

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