RESUMO
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.
RESUMO
Um estudo etnobotânico do uso de plantas medicinais foi realizado em Vista Alegre, distrito de Claro dos Poções - MG, de Novembro/2009 a Maio/2010. Em um total de 37 pessoas, 22 mulheres e 15 homens foram entrevistados. A idade dos participantes variou de 29 a 90 anos, onde 46% apresentaram idade entre 61 e 76 anos e 19% entre 77 e 90 anos. Foram identificadas 101 espécies, utilizadas como medicinais, distribuídas em 46 famílias botânicas em que, as mais representativas foram Fabaceae (17 spp.) e Asteraceae (10 spp.). As espécies Amburana cearensis (IR = 2,0) e Croton antisyphiliticus (IR = 1,6) tiveram maior importância relativa. A maioria das espécies é nativa do Brasil (85%). Os resultados mostram que os informantes têm um grande conhecimento sobre plantas medicinais nativas da região. Portanto, este trabalho pode representar uma forma de resgate cultural, já que este conhecimento encontra-se nas pessoas mais velhas.(AU)
An ethnobotanical study on use of medicinal plants was conducted at Vista Alegre district, Claro dos Poções - MG, from November/2009 to May/2010. In a total 37 people, 22 women and 15 men were interviewed. The age of respondents ranged from 29 to 90 years, where 46% between 61 and 76 years and 19% between 77 and 90 years. They identified 101 species used in traditional medicine distributed in 46 botanical families, the most representative were Fabaceae (17 spp.) and Asteraceae (10 spp.). The species Amburana cearensis (IR = 2.0) and Croton antisyphiliticus (IR = 1.6) had higher relative importance. The species are mostly Brazilian native (85%).The results show that the informants have great knowledge of native medicinal plants of the region; therefore, this work may represent a form of cultural revival, since this knowledge focuses on older people.(AU)
