| Texto completo | |
| Autor(es): |
Godinho, Joao Paulo Mariano
;
Taniwaki, Ricardo Hideo
;
Costa-Silva, Andre Renan
;
Montes, Celia Regina
;
Melfi, Adolpho Jose
;
Carmo, Janaina Braga do
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | INTERNATIONAL REVIEW OF HYDROBIOLOGY; v. N/A, p. 10-pg., 2025-08-25. |
| Resumo | |
The Pantanal, one of the largest wetlands on Earth, stores substantial carbon in its diverse ecosystems but faces increasing threats, such as fires, poor soil management, deforestation, and climate change impacts that may elevate CH4 emissions. Given the importance of this ecosystem, we investigated methane (CH4) emissions from the limnetic zone and marginal soils in a drying lagoon in the Pantanal during a drought period unprecedented in over 75 years. To this end, CH4 flux measurements were conducted along a transect with three replicates in each of the evaluated compartments, with four samples collected per day during both a dry-season and a wet-season campaign (2019-2020). The highest emissions occurred during the drying event, primarily in the aquatic compartment (7.43 mg +/- 5.51 CH4 m(-)(2) day(-)(1), mean +/- SD, n = 20), representing a 56-fold increase in CH4 emissions compared to the wet season, and along the margins (3.43 +/- 3.55 mg CH4 m(-)(2) day(-)(1), n = 12). This indicates that the lowering of the water column and exposed sediments became a significant source of CH4 emissions. Our results suggest that these environments can become large CH4 emitters during drying events. Accordingly, current CH4 emission models underestimate their contribution due to neglecting sediment exposure effects. With the expected increase in drying events in the Pantanal, CH4 emissions will likely rise in the coming years, exacerbating global warming and intensifying climate change. (AU) | |
| Processo FAPESP: | 16/14227-5 - Mudanças climáticas e impactos ambientais em áreas alagadas (wetlands) do Pantanal (Brasil): quantificação, fatores de controle e previsão em longo prazo |
| Beneficiário: | Adolpho José Melfi |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático |
| Processo FAPESP: | 18/10290-0 - Caracterização e quantificação das emissões de gases de efeito estufa pelos diferentes tipos de lagoas da Nhecolândia, Pantanal |
| Beneficiário: | João Paulo Mariano Godinho |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |