CHEMICAL ATTRIBUTES AND ORGANIC MATTER IN FOREST COMPLEX SEASONALLY FLOODED IN RESTINGA OF MARAMBAIA, RIO DE JANEIRO STATE

Abstract

http://dx.doi.org/10.5902/1980509812337This study aimed to evaluate and characterize the chemical properties of soil organic matter under twoperiodically flooded forest formations on the island of Marambaia, Rio de Janeiro. These formations differon the degree of soil water saturation, caused by the influence of water table, and in the (F1) formationpresents the water table nearer the surface compared to the (F2) formation. Samples were collected in layersfrom 0.00 to 0.05, 0.05-0.10 and 0.10-0.20 m. The soil properties evaluated were: pH, H+ + Al+3, Ca+2, Mg+2,Na+, K+, P, N, total organic carbon (TOC) and base saturation (V%), humin carbon fraction (C-HUM),carbon of humic acid fraction (HAF-C) and fulvic acid fraction carbon (FAF-C). Statistically higher pHvalues were observed for F1. In F2 there are higher values of Mg+2, P, N and V% value. Correlation wasfound between the concentrations of Mg+2, N, humic acid and fulvic acid with water table in F1, and watertable in F2 with Na+ and K+. Fraction C-HUM was more representative of the total organic carbon, followedby C-HAF and C-FAF. The TOC levels were higher in F1. The C / N ratio was lower in F2, with valuesranging between 9 and 12, and F1 were found higher values of this relationship, ranging from 9 to 15.Among the pathways of formation of organic soils in both areas it appears that the major route for organicmatter accumulation is the inheritance route

Keywords

• fertilidade natural
• carbono orgânico total, substâncias húmicas
• saturação hídrica