Atributos químicos do solo, fitossociologia, produção de biomassa e liteira em sistemas agroflorestais orgânicos e monocultivo de citrus em Capitão Poço, Pará.

Abstract

The objective of the study was to identify the spontaneous botanical species existing in two agroforestry systems with organic cultivation of citrus and to evaluate the production of biomass and litter. To identify the vegetal composition of the area, individuals present in the low-lying extract were evaluated, from two agroforestry systems and conventional system, with organic cultivation of oranges. To inventory the species present in the study areas, Lacerda, et al. (2016), so that samples of vegetation were collected in the lower extract (considering individuals with height <10 cm) the template used to inventory the species was 3m², randomly launched five times in each treatment. From the data obtained, the following phytosociological parameters were calculated: density; abundance; frequency; relative density; relative abundance and the importance value index. The biomass and litter samples were collected using a wooden template measuring 0.5 x 0.5 m, with two collections taking place: November 2016 and March 2017, the months of lowest and highest rainfall respectively. The poaceae family obtained the highest importance value in 7 of the 10 treatments studied. Regardless of the system studied, the production of dry litter mass was higher in the period of lower precipitation and for biomass it was higher in the period of higher rainfall. The agroforestry systems showed a number of similar families with a higher density of individuals in between crop lines.