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The aim of this stud y was to compare the chemical properties of soils of Indian black earth soils with no anthropogenic . The soil samples were taken in Tortoise archaeological site in Braganca / PA , which has a total area of 100m x 100m . The soil of this website belongs to the Order of Gleissolos . Samples were collected in three areas of the archaeological site ( E1S1; E1S2 and adjacent area ). For this study were collected at 5-10 cm depth . Ten simple samples were taken to compose a composite sample . The experimental design was completely randomized , with three areas of study and a soil type with 10 repetitions , each collection area within the site measures 10m . Total exchangeable bases, base saturation, exchangeable aluminum, aluminum saturation and effective CEC and CEC at pH 7: the variables were calculated. The average values of sum of bases, base saturation were higher in areas of Dark Earth. However, the average values of m% were lower in anthropogenic soils. While the average values of Al 3+ were lower in point E1S1 the archaeological site. The effective CEC was higher in areas E1S1 and E2S1 (29.21 and 20.93 cmolc/dm 3 respectively) and lowest in the area (5.55 cmolc/dm 3 ). While the average values of CEC at pH 7 was higher in areas E1S1 and E2S1 (41,88 and 32,39 cmolc/dm 3 respectively) and Adjacent the lower (15 cmolc/dm 3 ) area. The black earth indiums present are more fertile than non-anthropogenic soils. KEYWORDS: archaeological site, chemical characteristics, fertility.

CARACTERIZAÇÃO DOS ATRIBUTOS QUÍMICOS DE UM HORIZONTE ANTRÓPICO EM GLEISSOLOS DO NORDESTE PARAENSE