Mineralogy and genesis in an alkaline soil system in the southern Pantanal wetland, Brazil

Soils Surrounding Saline-Alkaline Lakes of Nhecolândia, Pantanal, Brazil: Toposequences, Mineralogy and Chemistry

“…The soils surrounding these lakes become alkaline, which results in values of soil electrical conductivity (ECs), pH and dissolved organic carbon (DOC) in soil water reaching 80 dS.m -1 , 11 and 750 mgC.L -1 , respectively (Mariot et al, 2007;Barbiero et al, 2008). They exhibit a number of characteristic features, in particular, the presence of deep, low-permeability green horizons, which are the sites of neoformation of specific secondary clay minerals, stevensite or Fe-illite (Barbiero et al, 2008;Furquim et al, 2008Furquim et al, , 2010aFurquim et al, , 2010bFurian et al, 2013;Andrade et al, 2020;Vidoca et al, 2020;Souza Oliveira et al, 2021). The 3-D morphology of the green horizons may govern part of the lake groundwater dynamics (Sakamoto et al, 2004; This preprint research paper has not been peer reviewed.…”

Fine scale mapping of phosphorus stocks in brazilian soils by geotechnologies: implications for a sustainable agriculture

“…The Ki maps represent the spatial variations of weathering degree in soils formed under different circumstances, as can be observed in Figure 8a hydromorphism is the main pedogenetic process in its soils, reducing weathering rates . Additionally, the parent materials in the Pantanal region often consist of carbonate sediments or exhibit a significant presence of sodium (Andrade et al, 2020;Oliveira et al, 2021). The chemical elements released during the weathering of these sediments that remain in the soil solution increase the pH, favoring the neoformation of 2:1 clay minerals (Couto et al, 2023).…”

“…The larger AP stocks in the soils of the Pantanal are due to the low potential for P adsorption in these soils. The low P adsorption is a result of the predominance of 2:1 type clay minerals and more alkaline pH due to higher calcium contents in the parent material (De Souza Oliveira et al, 2021). In addition, the flooding of the plains creates a reducing environment, releasing the P from the clays and making it available (Hamilton et al, 1997).…”