Estoque de carbono no solo em área de blowdown na floresta tropical úmida da Amazônia Central
Since the Industrial Revolution, the concentration of carbon dioxide in the atmosphere has increased by nearly forty percent. This increase may lead to indirect responses in Earth's climate system. In the Amazon basin, convective storms cause mortality of thousands of trees and form huge clearing...
| Autor principal: | Santos, Leandro Tavares dos |
|---|---|
| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
|
| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/5140 http://lattes.cnpq.br/5220349120584906 |
| Resumo: |
|---|
|
Since the Industrial Revolution, the concentration of carbon dioxide in the
atmosphere has increased by nearly forty percent. This increase may lead to indirect
responses in Earth's climate system. In the Amazon basin, convective storms cause
mortality of thousands of trees and form huge clearings in the forest. In 2005, this
phenomenon reached part of the Brazilian Amazon (± 150 million hectares) causing
mortality of millions of trees. This study evaluated the effects of excessive
accumulation of biomass suddenly deposited on the soil surface in this area. We
quantified the concentrations of soil organic carbon (COS), carbon storage (ECS),
nitrogen (N) and C/N ratio (CN) in a non-flooded forest of the central brazilian
Amazon hit by a convective storm in 2005. Also evaluated the concentrations
between different microsites (leaf litter, branches and stem). Sixteen plots were
sampled over a gradient of disturbance, predetermined from the tree mortality
intensity with DAP ≥ 10cm. Soil samples were collected from six profiles,
systematically allocated every five meters along the plots at three depths (0-10cm,
10-20cm and 20-30cm). For densities samples, one or two profiles were collected in
each plot. Each profile was classified according to the residues on the soil surface
(litter, branches or trunk). In general, the amount of COS, ECS and N were greater in
clay soils and lower in sandy soils. The highest values of COS, ECS and N were
found on soil surface (0-10cm), decreasing with depth. COS (p<0,0001), ECS (p=0,
0047) and N (p<0,0001) were higher in disturbed forest than in the undisturbed
forest. Soils located under thick residues (stem and branches), showed higher COS,
ECS and N than leaf litter. The values of carbon storage (ECS) of the disburbed
forest of blowdown area showed positive correlation with the different intensities of
disturbance (mortality of trees) and with the clay content in the soil. This pattern
minimizes the negative effects of these events, but does not diminish the importance
of the effects that these phenomena can have on a regional scale and can affect both
ecosystem and ecological processes in the forest. |