Resumo

DELGADO-CARRANZA, Carmen et al. The organic carbon stock in Leptosls with discontinuous distribution in the Peninsula of Yucatan. Ecosistemas y recur. agropecuarios [online]. 2017, vol.4, n.10, pp.31-38. ISSN 2007-901X.  https://doi.org/10.19136/era.a4n10.688.

The soil organic carbon (SOC) content requires quantifying the coarse fraction (stones and gravels), bulk density and depth. The soils inventory realized for INEGI didn’t reports the first two parameters, then, the generated SOC maps have considerable doubt SOC. The objective was to evaluate the spatial variability of soil organic carbon over short distances, as well as to report the contents of organic carbon per unit area in Leptosols from northern of Yucatan Peninsula. 102 samples were taken; organic carbon was analyzed by technique of potassium dichromate; and coarse fragments (coarse gravel, medium and ne gravel) were separated from the ne earth. The Color was recorded dry and wet, bulk density was measured using the amount of ne earth in a volume of 10 x 10 cm surface by a depth to nd the rock. Leptosols presented SOC values below 100 t ha-1 reported for this area, with mean values of 32.85, 37.57, 43.72, and 61.93 t ha-1, for dark brown soils, very dark brown, blacks and very dark grays respectively. Coarse fragments ranging from 6.7 % to 96.4 % with an average of 71.15 %. It was found that the values of soil organic carbon obtained in this study are lower than those reported in unit area.

Palavras-chave : Organic matter; coarse fraction; bulk density; soil development; geostatistics.