Abstract

YESCAS-CORONADO, Pedro et al. Spatial variability of organic and inorganic carbon in soils of the Comarca Lagunera, México. Bol. Soc. Geol. Mex [online]. 2018, vol.70, n.3, pp.591-610. ISSN 1405-3322.  https://doi.org/10.18268/bsgm2018v70n3a2.

Organic, inorganic and total soil carbon stocks are partially controlled by exposure to environmental conditions, vegetation cover and land use. Geostatistics has helped to understand the distribution of carbon stocks (organic, inorganic and total) in the soils. However, there is little explanation of factors that determine it, specifically arid regions, and their spatial variability. The objectives of this work were to determine the organic and inorganic carbon reserves in agricultural soils of the Comarca Lagunera in Mexico, to establish their distribution and spatial variability using ordinary kriging and to validate the thematic maps whit real data. The correlation spatial of organic, inorganic and total soil carbon stocks of georeferenced samples were examined by an analysis of semivariance; the data were interpolated to obtain thematic maps of prediction of the different carbon stocks. Subsequently, the maps were validated with field data. The organic, inorganic and total soil carbon stocks showed spatial correlation, which was weak for the soil organic carbon storage (82.4%), and moderate for the inorganic and total carbon (26.6 and 35.0%, respectively). The thematic maps of organic and inorganic carbon stores differed, with the inorganic carbon map having an error of 2.01 Mg ha-1, which was lower than that of organic carbon (4.69 Mg ha-1). The use and management of soils in this area influenced the spatial distribution of carbon stocks, while physiography, parent material and climate intervened in the spatial distribution of inorganic carbon.

Keywords : Organic matter; carbonates; geostatistics; arid region.

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