Crab Bioturbation and Seasonality Control Nitrous Oxide Emissions in Semiarid Mangrove Forests (Ceara, Brazil)

Autor(es)

Barcellos, Diego ^[1] ; Romero, Danilo J. ^[1] ; Nobrega, Gabriel N. ^[2] ; Siqueira Neto, Marcos ^[7] ; Ferreira, Tiago O. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Soil Sci, Coll Agr Luiz de Queiroz, ESALQ USP, Av Padua Dias 11, BR-13418 Piracicaba, SP - Brazil

^[2] Fed Fluminense Univ, Dept Geochem, Grad Program Geosci Geochem, Outeiro Sao Joao Batista S-N, Campus Valonguinho, BR-24020 Niteroi, RJ - Brazil

^[3] CENA USP, Ctr Energia Nucl Agr, Lab Biogeoquim Ambiental, Av Centenario 303, BR-13400 Piracicaba, SP, Brazil.Otero, Xose L., Univ Santiago de Compostela, CRESTUS Inst, Fac Biol, Dept Edafol & Quim Agr, Rua Lope G Marzoa S-N, Campus Sur, Santiago De Compostela 15782 - Spain

• Tipo de documento: Artigo Científico
• Fonte: APPLIED SCIENCES-BASEL; v. 10, n. 7 APR 2020.
• Citações Web of Science: 0

Resumo

Seasonality and crab activity affects the nutrients and physicochemical parameters in mangrove soils, thus, affecting the emissions of greenhouse gases, such as nitrous oxide (N2O). Climate change may intensify rainfall and/or enhance droughts, affecting mangroves and associated biota. Crabs are natural soil bioturbators responsible for soil aeration and turnover. We evaluated the effect of Ucides cordatus crab on N2O emissions from mangrove soils under a semiarid climate in Northeastern Brazil. Soil and gas samples were collected over the rainy and dry seasons in crab-naturally-bioturbated and crab-exclusion mangrove plots. We measured the soil's pH, redox potential, and the total contents of carbon, nitrogen, and sulfur. We found higher N2O emissions in the crab-exclusion sites compared to the bioturbated sites, as well as higher N2O emissions in the rainy season compared to the dry season. The fluxes of N2O (mu g m(-2) h(-1)) were 47.3 +/- 9.7 and 8.9 +/- 0.5 for the crab-exclusion sites, and 36.5 +/- 7.8 and 4.5 +/- 2.1 for the bioturbated sites (wet and dry seasons, respectively). The soil turning over by macrofauna led to lower N2O fluxes in natural crab-bioturbated areas, and seasonality was the environmental factor that contributed the most to the changes in N2O emissions. Broadly, anthropic activities and seasonality influence nitrogen fate, N2O emissions, and ecological services in coastal ecosystems. (AU)

• Processo FAPESP: 18/04259-2 - Biogeoquímica de ferro e seu controle sobre a dinâmica de metais traço nos solos do estuário do Rio Doce após o "desastre de Mariana"
• Beneficiário: Hermano Melo Queiroz
• Modalidade de apoio: Bolsas no Brasil - Doutorado