RELAÇÃO ENTRE CARBONO ORGÂNICO TOTAL, GLOMALINA E ESTABILIDADE DE AGREGADOS EM NEOSSOLO LITÓLICO

Abstract

The soil structure is maintained by the aggregation of mineral and organic particles, where organic matter and glomalin levels stand out as factors that interfere in the stability of these aggregates. Knowing the stocks of glomalin in different ecosystems can help to better understand the dynamics of this protein in the soil and its contribution to soil aggregation. The objective of the present work was to estimate and correlate the total organic carbon (TOC), easily extractable glomalin (EEG) and the aggregate stability index (ASI) in the area of Neossolo Litólico under caatinga vegetation. Two areas, one under arboreal and other shrub vegetation, were selected, 18 single samples of one Neossolo Litólico were collected (9 samples per area x two areas) and analyzed for organic carbon, glomalin and aggregate stability. The highest levels of total organic carbon were found in the area under arboreal vegetation. On the other hand, glomalin extractable contents were similar in the areas. The aggregate stability index was higher in the area under shrub caatinga vegetation. The total organic carbon correlated positively with the glomalina easily extractable, independent of the vegetal cover. The aggregate stability index did not correlate with the total organic carbon, nor with easily extractable glomalin.