Resumo

PULIDO-MONCADA, Mansonia et al. Changes in organic matter dynamic fractions of two soils, Inceptisol and Ultisol, by growing citrus crops. Bioagro [online]. 2010, vol.22, n.3, pp.201-210. ISSN 1316-3361.

Organic matter (OM) is one of the most accepted parameters as indicator of changes in soil quality; however, its dynamic fractions can be even more sensitive to the effects of soil management and vegetation type. Determination of early changes due to soil management can be important in tropical soils, because the biological processes of the modified ecosystems can occur at high rates. The objective of this work was to determine if the OM dynamic fractions can reflect changes in the quality of two soils types (Inceptisol and Ultisol) due to the use with fruit crops. In plots with secondary forest and citric crops the soil physical and chemical characteristics as well as the OM dynamic fractions were evaluated. The results showed that the soil with less evolution presented higher changes in the carbon efficient use at the citrus cropped plots. The changes are attributed to soil pH, the lower microbial biomass and minor crop OM quality, along with the intensive soil management.

Palavras-chave : Microbial biomass; soil quality; modified ecosystems; soil management.