Spatiotemporal Variability in Soil Properties and Composition in Mangrove Forests in Baía de Todos os Santos (NE Brazil)

Monica Arlinda Vasconcelos Ramos, Augusto Pérez-Alberti (), Gabriel Nuto Nóbrega and Xosé Luis Otero
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Monica Arlinda Vasconcelos Ramos: CRETUS, Departamento de Edafoloxía e Química Agrícola, Facultade de Bioloxía, Universidade de Santiago de Compostela, 15705 Santiago, Spain
Augusto Pérez-Alberti: CRETUS, Departamento de Edafoloxía e Química Agrícola, Facultade de Bioloxía, Universidade de Santiago de Compostela, 15705 Santiago, Spain
Gabriel Nuto Nóbrega: Departamento de Ciências do Solo, Centro de Ciências Agrárias (CCA), Universidade Federal do Ceará, Fortaleza 60020-181, Brazil
Xosé Luis Otero: CRETUS, Departamento de Edafoloxía e Química Agrícola, Facultade de Bioloxía, Universidade de Santiago de Compostela, 15705 Santiago, Spain

Land, 2023, vol. 12, issue 7, 1-20

Abstract: Soil properties and components in mangrove ecosystems influence their geochemical processes and services. Despite the extensive mangrove areas present in Brazil, few studies focusing on these themes are under development. In this sense, this work aimed to investigate the spatial variability in soil attributes and composition, the geochemistry of Fe, and the isotopic characteristics of organic matter in mangroves in Baía de Todos os Santos (Cacha Prego, Ponta Grossa, Ilha de Maré, Pitinga), which constitutes Brazil’s second largest bay. The soils investigated showed spatial and temporal changes affecting their properties (pH, Eh) and composition (TOC, Fe fractions), as well as clear spatial changes in the redox potential values (+30–+188 mV), with higher values in PT. Soil textures ranged from predominantly sandy (CP, PT, PG: sand, >70%) to a finer granulometry (IM: sand, 33–64%). These characteristics influenced Fe partitioning and organic matter content, with higher TOC and pyrite values observed in IM (FeS 2 : 2720–9233 mg kg −1 ; TOC: 4.4–6.6%) and lower sulfide values found in PT, mainly in the dry season (FeS 2 : 85–235 mg kg −1 ). The soil δ 13 C and N/C ratios seem to suggest a mixed origin of organic matter.

Keywords: soil geochemistry; pyrites; iron partitioning; organic matter; isotopic signatures; FESEM (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:gam:jlands:v:12:y:2023:i:7:p:1392-:d:1192219

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