6 documents found, page 1 of 1
Soil CO2 efflux in central Amazonia: environmental and methodological effects
Zanchi, Fabrício Berton; Waterloo, Maarten J.; Kruijt, Bart J.; Kesselmeier, Jürgen; Luizão, Flávio Jesus; Manzi, Antônio Ocimar; Dolman, Albertus J.Respiração do solo possui um importante papel no ciclo do carbono em florestas tropicais Amazônicas. Entretanto poucas medidas de respiração do solo foram feitas. Neste estudo são apontados os efeitos na metodologia de instalação dos anéis no solo, bem como os efeitos da precipitação e a distribuição espacial da emissão de CO2 na Amazônia central. Os efeitos da inserção de anéis no solo aumentaram de 13 a 20% p...
Estimate of the Leaf Area Index (LAI) and Biomass in pasture in the state of Ro...
Zanchi, Fabrício Berton; Waterloo, M. J.; Aguiar, Leonardo José Gonçalves; Von Randow, Celso; Kruijt, Bart J.; Cardoso, Fernando LuizMonthly measurements of the grass height, total above-ground biomass and the proportions of live and dead biomass, Specific Leaf Area (SLA) and Leaf Area Index (LAI) were made in one cattle ranch at the Fazenda Nossa Senhora (FNS) (February of 1999 to January of 2005) and also in Rolim de Moura (RDM) (February to March of 1999) in Rondônia state. The predominant grass species is Urochloa brizantha (Hochst. ex A...
Isoprene and monoterpene fluxes from Central Amazonian rainforest inferred from...
Kühn, Uwe; Andreae, Meinrat O.; Ammann, Christoph; Araüjo, Alessandro Carioca de; Brancaleoni, Enzo; Ciccioli, Paolo; Dindorf, TamaraWe estimated the isoprene and monoterpene source strengths of a pristine tropical forest north of Manaus in the central Amazon Basin using three different micrometeorological flux measurement approaches. During the early dry season campaign of the Cooperative LBA Air-borne Regional Experiment (LBA-CLAIRE-2001), a tower-based surface layer gradient (SLG) technique was applied simultaneously with a relaxed eddy a...
Variation in stem mortality rates determines patterns of above-ground biomass i...
Johnson, Michelle O.; Galbraith, David R.; Gloor, Manuel E.; Deurwaerder, Hannes de; Guimberteau, Matthieu; Rammig, Anja; Thonicke, KirstenUnderstanding the processes that determine above-ground biomass (AGB) in Amazonian forests is important for predicting the sensitivity of these ecosystems to environmental change and for designing and evaluating dynamic global vegetation models (DGVMs). AGB is determined by inputs from woody productivity [woody net primary productivity (NPP)] and the rate at which carbon is lost through tree mortality. Here, we...
Flood tolerance in two tree species that inhabit both the Amazonian floodplain ...
Pires, Hérica Ribeiro Almeida; Franco, Augusto C.; Piedade, Maria Teresa Fernandez; Scudeller, Veridiana Vizoni; Kruijt, Bart J.Comparing plants of the same species thriving in flooded and non-flooded ecosystems helps to clarify the interplay between natural selection, phenotypic plasticity and stress adaptation. We focussed on responses of seeds and seedlings of Genipa americana and Guazuma ulmifolia to substrate waterlogging or total submergence. Both species are commonly found in floodplain forests of Central Amazonia and in seasonal...
Performance of laser-based electronic devices for structural analysis of Amazon...
Pereira, Iokanam Sales; do Nascimento, Henrique E.Mendonça; Vicari, Matheus Boni; Disney, Mathias I.; DeLucia, Evan H.; null, Tomas; Kruijt, Bart J.Tropical vegetation biomass represents a key component of the carbon stored in global forest ecosystems. Estimates of aboveground biomass commonly rely on measurements of tree size (diameter and height) and then indirectly relate, via allometric relationships and wood density, to biomass sampled from a relatively small number of harvested and weighed trees. Recently, however, novel in situ remote sensing techni...