Análise multi-anual da dinâmica de produção de serapilheira fina em uma floresta da Amazônia Central
Extreme events of climate variables, above all those involving precipitation, are associated to temperature anomalies of surface sea temperatures of the Atlantic and Pacific (ASST). This work has then evaluated climatic effects, including those arising from sea surface anomalies of the Atlantic a...
| Autor principal: | Conceição, Adriana Castro da |
|---|---|
| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
|
| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/12624 http://lattes.cnpq.br/3998933277394770 |
| Resumo: |
|---|
|
Extreme events of climate variables, above all those involving precipitation, are associated to
temperature anomalies of surface sea temperatures of the Atlantic and Pacific (ASST). This work
has then evaluated climatic effects, including those arising from sea surface anomalies of the
Atlantic and Pacific, over the dynamics of litterfall on a multi-year record from forests along a
landscape gradient consisting of plateau, slope and valley botton. The study site was the Reserva
Biológica do Cuieiras, one of the main field sites for the Large Scale Biosphere-Atmosphere
experiment (LBA), 60km north of Manaus, Brazil. Fine litterfall production was measured every
fifteen days on 50x50 cm litter baskets, located in nine subplots at each topographic position.
Litterfall production (of leaves, twigs and fertile material) along the years of 2005 to 2014,
ranged from 9,4 to 7,1 t/ha in the plateau forests, 9,4 to 7,2 t/ha at the slopes and 7,9 to 6,2 t/ha in
the valleys. The highest production recorded for the plateau forests occurred in 2005, while
slopes and valleys had the highest recorded productions in 2009, which were the years with
strongest influence of climate anomalies. Production rates were found to be significantly different
among years for the three topographic positions and showed clear relation to ASST. A clear
seasonal pattern was also found for fine litterfall and its components, with higher production on
the drier months of the year (June to November) and lowest on the wettest months (December to
May). In 2005, litterfall production responded significantly to anomalies of the North Atlantic,
while in 2009 both the North Atlantic and Pacific (El Niño) anomalies influenced production
rates. Therefore we observed connections between climatic anomalies and litterfall production in
Amazonia, suggesting that litterfall production may be direct or indirectly affect by climate
change once a positive interaction is expected between climate change and anomalies of sea
surface temperature. |