Fitossociologia de uma floresta de várzea e de igapó na planície de inundação do Rio Maracá, Amapá, Amazônia Oriental

Abstract

There is little published information on soil characteristics and their relationship with the occurrence of palm trees in the estuarine coast of Amapa. This study was conducted in order to compare the characteristics of the soil and the abundance of palm trees, among the floodplain environments and igapó found in the lower Rio Maraca, near the confluence with the Amazon River. In this portion of the Maraca River basin were allocated 4 transects (T1, T2, T3 and T4) 1000m with 20 plots 10m x 25m each, up the tributary of the Amazon, distant at least 1 km from each other to ensure the independence between them and create a gradient away from the Amazon river. During the summer (December / 2015) were collected with a Dutch auger five single samples of soil at the depth of 0-5 cm to form one sample per share, for the analysis of texture and soil nutrients. The results of the physical and chemical properties of soils were submitted to descriptive statistics, calculating the average, minimum, maximum and coefficient of variation for each attribute in Microsoft Excel 2010. The soil igapó showed higher acidity and exchangeable aluminum content . The Euterpe oleracea Mart species. showed higher density and importance in igapó ecosystem