The carbon sink of tropical seasonal forests in southeastern Brazil can be under threat.
Vinícius Andrade MaiaAlisson Borges Miranda SantosNatália de Aguiar-CamposCléber Rodrigo de SouzaMatheus Coutinho Freitas de OliveiraPolyanne Aparecida CoelhoJean Daniel MorelLauana Silva da CostaCamila Laís FarrapoNathalle Cristine Alencar FagundesGabriela Gomes Pires de PaulaPaola Ferreira SantosFernanda Moreira GianasiWilder Bento da SilvaFernanda de OliveiraDiego Teixeira GirardelliFelipe D C AraújoTaynara Andrade VilelaRafaella Tavares PereiraLidiany Carolina Arantes da SilvaGisele Cristina de Oliveira MeninoPaulo Oswaldo GarciaMarco Aurélio Leite FontesRubens Manoel Dos SantosPublished in: Science advances (2020)
Tropical forests have played an important role as a carbon sink over time. However, the carbon dynamics of Brazilian non-Amazon tropical forests are still not well understood. Here, we used data from 32 tropical seasonal forest sites, monitored from 1987 to 2020 (mean site monitoring length, ~15 years) to investigate their long-term trends in carbon stocks and sinks. Our results highlight a long-term decline in the net carbon sink (0.13 Mg C ha-1 year-1) caused by decreasing carbon gains (2.6% by year) and increasing carbon losses (3.4% by year). The driest and warmest sites are experiencing the most severe carbon sink decline and have already moved from carbon sinks to carbon sources. Because of the importance of the terrestrial carbon sink for the global climate, policies are needed to mitigate the emission of greenhouse gases and to restore and protect tropical seasonal forests.