Atributos químicos do solo e interação com folhas de serapilheira em manguezais da ilha de Itarana e comunidade Caranã, São João de Pirabas, Pará, Brasil

Abstract

Mangroves are coastal ecosystems situated in the land-sea interface, under constant influence of the dynamics of the tides. It is known that this ecosystem is considered one of the most productive in the world, due to the large amount of organic matter that is produced and fed into other environments. This productivity, in turn, has its origin both in litterfall produced within the system itself, the inputs of nutrients arising tidal and storm water. The nutrient dynamics in mangroves is linked to factors such as the frequency of flooding by tides, the seasonal period, the topography and biogeochemical processes. In this context, this study aims to evaluate the soil chemical properties and verify the interaction between soil and leaf litterfall in mangroves in northeast Pará, in the rainy and less rainy season. For this, samples of soil and leaf litterfall were collected in different seasonal periods, for analyses of pH, Eh, interstitial salinity, C, N, S, P, Fe, Na +, K +, Ca + 2, Mg + 2 and Al + 3. The results of soil chemical properties show that seasonality exerted greater influence on the results of Na +, K + and interstitial salinity. The intertidal mangrove presented nutrient content of higher soil when compared to the supramaré mangrove. In general, there was a relation to the concentration of the soil nutrients with the concentration of nutrients in leaf litterfall, more evident in the high carbon concentration, as well as the lifting conditions content of some nutrients in leaf litterfall of supramaré mangrove during the rainy season.