| Texto completo | |
| Autor(es): |
Gorgens, Eric Bastos
;
Keller, Michael
;
Jackson, Toby
;
Marra, Daniel Magnabosco
;
Reis, Cristiano Rodrigues
;
de Almeida, Danilo Roberti Alves
;
Coomes, David
;
Ometto, Jean Pierre
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Biotropica; v. 55, n. 4, p. 12-pg., 2023-05-02. |
| Resumo | |
Canopy gaps are evidence of disturbances on forest landscapes. A forest stand is in constant flux, with long stretches of biomass accumulation punctuated by episodic disturbances. We used multitemporal airborne laser scanning data to compare the gap dynamics of four Amazon forest sites. We assessed gap dynamics over 1.9-3.8 years between 2017 and 2020 at sites in the central, central eastern, southeastern, and northeastern regions of the Brazilian Amazon, over areas ranging from 590 to 1205 ha at each site. Gap size ranged from a minimum of 10 m(2) to a maximum of about 10,000 m(2). We analyzed four stages of gap dynamics: formation, expansion, persistence, and recovery based on two consecutive airborne laser scanning surveys. The gap fraction at our study sites varied between 1.26% and 7.84%. All the sites have similar proportion of gaps among gap size classes. What notably differed among sites was not the gap size-distribution, but the relative importance of stages of gap dynamics. Expansion and persistence rates ranged from 12 to 118 m(2) ha(-1). The gap formation rate (formation + expansion) was lower than the recovery rate for three of the four study sites. In contrast, the southeastern site has 1.44 times more area in formation and expansion compared to gap recovery. Over the 2-4 years interval of our study, no site was close to steady state. Multitemporal analyses of large areas over many years are needed to improve our understanding of tropical forest dynamics. (AU) | |
| Processo FAPESP: | 18/21338-3 - Monitoramento da restauração de paisagens florestais usando veículo aéreo não tripulado com sensoriamento remoto Lidar e hiperespectral |
| Beneficiário: | Danilo Roberti Alves de Almeida |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 19/14697-0 - Monitoramento da demografia e diversidade de florestas em processo de restauração usando um sistema drone-lidar-hiperespectral |
| Beneficiário: | Danilo Roberti Alves de Almeida |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |