Maia Vinícius Andrade, Santos Alisson Borges Miranda, de Aguiar-Campos Natália, de Souza Cléber Rodrigo, de Oliveira Matheus Coutinho Freitas, Coelho Polyanne Aparecida, Morel Jean Daniel, da Costa Lauana Silva, Farrapo Camila Laís, Fagundes Nathalle Cristine Alencar, de Paula Gabriela Gomes Pires, Santos Paola Ferreira, Gianasi Fernanda Moreira, da Silva Wilder Bento, de Oliveira Fernanda, Girardelli Diego Teixeira, de Carvalho Araújo Felipe, Vilela Taynara Andrade, Pereira Rafaella Tavares, da Silva Lidiany Carolina Arantes, de Oliveira Menino Gisele Cristina, Garcia Paulo Oswaldo, Fontes Marco Aurélio Leite, Dos Santos Rubens Manoel
Departamento de Ciências Florestais, Universidade Federal de Lavras, P.O. Box 3037, Lavras, MG 37200-900, Brazil.
Departamento de Ciências Biológicas, Universidade Federal de Lavras, P.O. Box 3037, Lavras, MG 37200-900, Brazil.
Sci Adv. 2020 Dec 18;6(51). doi: 10.1126/sciadv.abd4548. Print 2020 Dec.
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 year) 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.
长期以来，热带森林一直作为碳汇发挥着重要作用。然而，巴西非亚马逊热带森林的碳动态仍未得到充分了解。在此，我们使用了1987年至2020年监测的32个热带季节性森林站点的数据（平均站点监测时长约15年）来研究它们碳储量和碳汇的长期趋势。我们的研究结果凸显了净碳汇的长期下降（每年0.13公吨碳/公顷），这是由碳吸收量下降（每年2.6%）和碳损失增加（每年3.4%）导致的。最干旱和最温暖的站点正经历着最严重的碳汇下降，并且已经从碳汇转变为碳源。鉴于陆地碳汇对全球气候的重要性，需要制定政策来减少温室气体排放，并恢复和保护热带季节性森林。
