Genesis, Characterization, and Classification of Mangrove Soils in the Subaé River Basin, Bahia, Brazil

Autor: Marcela Rebouças Bomfim, Jorge Antonio Gonzaga Santos, Oldair Vinhas Costa, Xosé Luis Otero, Geraldo da Silva Vilas Boas, Valdinei da Silva Capelão, Edson de Souza dos Santos, Paulo Gabriel Soledade Nacif
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: Revista Brasileira de Ciência do Solo, Vol 39, Iss 5, Pp 1247-1260 (2015)
Druh dokumentu: article
ISSN: 1806-9657
01000683
DOI: 10.1590/01000683rbcs20140555
Popis: ABSTRACT Preservation of mangroves, a very significant ecosystem from a social, economic, and environmental viewpoint, requires knowledge on soil composition, genesis, morphology, and classification. These aspects are of paramount importance to understand the dynamics of sustainability and preservation of this natural resource. In this study mangrove soils in the Subaé river basin were described and classified and inorganic waste concentrations evaluated. Seven pedons of mangrove soil were chosen, five under fluvial influence and two under marine influence and analyzed for morphology. Samples of horizons and layers were collected for physical and chemical analyses, including heavy metals (Pb, Cd, Mn, Zn, and Fe). The moist soils were suboxidic, with Eh values below 350 mV. The pH level of the pedons under fluvial influence ranged from moderately acid to alkaline, while the pH in pedons under marine influence was around 7.0 throughout the profile. The concentration of cations in the sorting complex for all pedons, independent of fluvial or marine influence, indicated the following order: Na+>Mg2+>Ca2+>K+. Mangrove soils from the Subaé river basin under fluvial and marine influence had different morphological, physical, and chemical characteristics. The highest Pb and Cd concentrations were found in the pedons under fluvial influence, perhaps due to their closeness to the mining company Plumbum, while the concentrations in pedon P7 were lowest, due to greater distance from the factory. For containing at least one metal above the reference levels established by the National Oceanic and Atmospheric Administration (United States Environmental Protection Agency), the pedons were classified as potentially toxic. The soils were classified as Gleissolos Tiomórficos Órticos (sálicos) sódico neofluvissólico in according to the Brazilian Soil Classification System, indicating potential toxicity and very poor drainage, except for pedon P7, which was classified in the same subgroup as the others, but different in that the metal concentrations met acceptable standards.
Databáze: Directory of Open Access Journals
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