Variabilidade espacial da estabilidade dos agregados e matéria orgânica do solo em terra preta arqueológica sob pastagem

Abstract

The soil aggregation may represent a parameter that relates handling to soil quality for archaeological black earth (TPA). The objective was to study the spatial variability of the aggregates and soil organic matter in archaeological black earth under pasture. The data were collected in a sample plot with dimensions of 80 x 56 m, with space between the points of 08 m, and total of 88 sampling points. Soil samples were collected at depths 0.0-0.05, 0.05-0.10 and 0.10 to 20 m, for evaluations: geometric mean diameter (GMD), aggregate class > 2,00mm, 2-1 mm, the aggregate stability index (ESI) and soil organic matter (SOM); after exploratory and geostatistical analysis, the models were fitted to semivariograms for each attribute. The results showed that the percentage of aggregates in the class > 2.00 mm had values above 80%, indicating greater resistance to breakdown. The high SOM content in the soil influenced the formation and stabilization of soil aggregates.