Estimativa da capacidade de capacidade de troca Catiônica e variabilidade espacial dos atributos químicos da camada superficial dos solos do Estado da PB.

Abstract

This work aimed to estimate the CEC and geospatialize the chemical attributes for the surface layer of soils in the State of Paraíba using geoprocessing techniques. A spreadsheet was created with data from the chemical analyzes of Na2+, Ca2+, Mg2+, K2+, Al3+, H+, described in representative profiles. Using the QGIS© software, the soils were classified with the values obtained. The effective and Total Cation Exchange Capacity of the soils were estimated by modeling and classified. A descriptive analysis of the data and a normality test were carried out using the RStudio© software, non-parametric hypothesis tests were used. Effective and Total CEC followed the sequence of Vertisols>Luvisols>Fluvic Neosols>Cambisols>Plintosols>Quartzarenic Neosols. The effective CTC was distributed in 84.18% of the lands in the Middle and Upper class; in 15.82% in the Lower class under Litholic and Regolitic Neosols, Argisols, and in the coastal region under Quartzarenic Neosols. CTC Total was in the Upper class at 37.17%, with emphasis on Fluvial Neosols. Na2+ presented 83.35% of the land in the Lower class; Ca2+ was 65.84% in the High and Very High classes under Vertisols, Cambisols, Luvisols and Fluvisols; Mg2+ made up 57.53% in the High and Very High classes distributed throughout the semi-arid region; K+ values were present in 88.05% of the lands in the Low class under the Luvisols, Vertisols and Planosols; H2+ was present in 81.53% of the lands in the Lower class. The variable H+ followed an abnormal behavior in the distribution in terms of quantiles.