Capacidade de retenção hídrica, estoque e macronutrientes (N, P e K) da liteira ecossistemas sucessionais nos tabuleiros costeiros da Amazônia Oriental.

Abstract

The litter can influence the water balance of the ecosystems and their ecological processes. In this study, the ex-situ water retention capacity was evaluated by the Blow method, in three distinct arcas of the Environmental Protection Arca of the metropolitan region of Belém-PA, during the periods, rainy and less rainy, accumulated litter stock and Quantification of the macronutrients (N, P, K) that it can transfer to the soil in the following ecosystems: Mocambo Reserve, arca of studies and research of EMBRAPA Amazônia Oriental; Monkey Trail - located inside the Utinga State Park (PEUt); Forest of UFRA located in Campus UFRABelém. For the sample collection, a collector with measures of 0.25 x 0.25 x 0.05 m was used, in which it was arranged randomly in the plots. Each ecosystem was schematized in five treatments, and in each treatment seven random samples were collected, totaling thirty - five samples, at each time of the year. In the rainy season, the highest water retention capacity was found in the Monkey Track with a mean of 258.45%, and in the less rainy period the Mocambo Reserve obtained 157.9%. In the analysis of the accumulated litter stock, the Monkey Track also presented higher stock (17.8 Mg.ha-1) in the rainy season, but in the less rainy forest the UFRA Forest had a higher stock (10.09 Mg.ha-1). Among the macronutrients N, P, K comparing the three arcas, it was observed that the Mocambo Reserve had the lowest average amounts of N, P, K. However, the UFRA Forest exhibited a greater amount of N and P, and the highest Amount of K on the Monkey Track.