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Acta Amazonica

versión impresa ISSN 0044-5967versión On-line ISSN 1809-4392


SILVA, George Rodrigues da; SILVA JR., Mário Lopes da  y  MELO, Vânia Silva de. Effect of land use and management on chemical properties of a yellow latosol in Pará State, Brazil. Acta Amaz. [online]. 2006, vol.36, n.2, pp.151-157. ISSN 0044-5967.

The study was conducted at the Experimental Station "José Haroldo" of CEPLAC, Benevides, PA, to determine changes in chemical properties of a Yellow Latosol, medium texture, under different land cover systems. Samples were collected from the Ap, AB, BA, B21 horizons of the soil under a 40-year old secondary forest (FS), recent slash and burned secondary forest (DQ), cocoa cropping (CC) and degraded grassland (PA). Soil samples were analyzed for pH, organic carbon (SOC), total nitrogen (N), available phosphorus (P) and exchangeable bases (K+, Ca2+, Mg2+, Na+). Relationships among the soil chemical properties were determined by regression analysis. Results showed that available P, SOC and total N decreased with soil depth in all management systems. Highest values of available P, SOC and total N were found in the Ap horizon following the sequence cocoa > grassland > secondary forest. There was significant correlation between pH and SOC, and between SOC and soil N, and available P.

Palabras clave : Land use; tropical soil; Amazon Basin.

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