7 documents found, page 1 of 1
The Amazon Tall Tower Observatory (ATTO): Overview of pilot measurements on eco...
Andreae, Meinrat O.; Acevedo, Otávio C.; Araüjo, Alessandro Carioca de; Artaxo, Paulo; Barbosa, Cybelli G.G.; Barbosa, H. M. J.; Brito, Joel F.The Amazon Basin plays key roles in the carbon and water cycles, climate change, atmospheric chemistry, and biodiversity. It has already been changed significantly by human activities, and more pervasive change is expected to occur in the coming decades. It is therefore essential to establish long-term measurement sites that provide a baseline record of present-day climatic, biogeochemical, and atmospheric cond...
Drought-induced Amazonian wildfires instigate a decadal-scale disruption of for...
Silva, Camila V.J.; Aragao, L. E.O.C.; Barlow, Jos; Espírito-Santo, Fernando; Young, Paul J.; Anderson, Liana Oighenstein; Berenguer, ErikaDrought-induced wildfires have increased in frequency and extent over the tropics. Yet, the long-term (greater than 10 years) responses of Amazonian lowland forests to fire disturbance are poorly known. To understand post-fire forest biomass dynamics, and to assess the time required for fire-affected forests to recover to pre-disturbance levels, we combined 16 single with 182 multiple forest census into a uniqu...
Leaf phenology as one important driver of seasonal changes in isoprene emission...
Alves, Eliane Gomes; Tóta, Júlio; Turnipseed, Andrew A.; Guenther, Alex B.; Vega Bustillos, José Oscar W.; Santana, Raoni Aquino Silva deIsoprene fluxes vary seasonally with changes in environmental factors (e.g., solar radiation and temperature) and biological factors (e.g., leaf phenology). However, our understanding of the seasonal patterns of isoprene fluxes and the associated mechanistic controls is still limited, especially in Amazonian evergreen forests. In this paper, we aim to connect intensive, field-based measurements of canopy isopre...
In vitro multiplication and elongation of hybrid clones of Eucalyptus globulus
Oliveira, Leandro Silva; Xavier, Aloísio; Lopes, Aline Pontes; Takahashi, Elizabete Keiko; Otoni, Wagner CamposEucalyptus globulus hybrids represent an excellent alternative to the pulp and paper sector, because of gains in wood quality for pulp. However, these hybrids have shown recalcitrance to adventitious rooting. Thus, micropropagation is considered the technique for rejuvenating adult genetic materials, allowing its clonal propagation. This study evaluated the in vitro culture of three clones of Eucalyptus grandis...
Leaf development and demography explain photosynthetic seasonality in Amazon ev...
Wu, Jin; Albert, Loren P.; Lopes, Aline Pontes; Restrepo-Coupé, Natalia; Hayek, Matthew N.; Wiedemann, Kenia T.; Guan, Kaiyu; Stark, Scott C.In evergreen tropical forests, the extent, magnitude, and controls on photosynthetic seasonality are poorly resolved and inadequately represented in Earth system models. Combining camera observations with ecosystem carbon dioxide fluxes at forests across rainfall gradients in Amazônia, we show that aggregate canopy phenology, not seasonality of climate drivers, is the primary cause of photosynthetic seasonality...
Spectral analysis of amazon canopy phenology during the dry season using a towe...
Amaral, Cibele Hummel do; Moura, Yhasmin Mendes de; Galvão, Lênio Soares; Hilker, Thomas; Wu, Jin; Saleska, Scott; Nelson, Bruce WalkerThe association between spectral reflectance and canopy processes remains challenging for quantifying large-scale canopy phenological cycles in tropical forests. In this study, we used a tower-mounted hyperspectral camera in an eastern Amazon forest to assess how canopy spectral signals of three species are linked with phenological processes in the 2012 dry season. We explored different approaches to disentangl...
Multiplicação in vitro de clones híbridos de Eucalyptus globulus
Borges, Silvano Rodrigues; Xavier, Aloisio; Oliveira, Leandro Silva de; Lopes, Aline Pontes; Otoni, Wagner CamposO presente estudo teve como objetivos avaliar a resposta de clones híbridos de Eucalyptus globulus nos meios de cultura MS e JADS durante a fase de multiplicação in vitro. Os explantes foram provenientes da fase de estabelecimento in vitro de 21 clones de Eucalyptus urophylla x E. globulus, sendo 11 clones com três introduções in vitro, e de seis clones de Eucalyptus grandis x E. globulus, sendo dois clones com...