6 documents found, page 1 of 1
Multiple phosphorus acquisition strategies adopted by fine roots in low-fertili...
Lugli, Laynara F.; Andersen, Kelly M.; Aragao, L. E.O.C.; Cordeiro, Amanda L.; Cunha, Hellen Fernanda Viana; Fuchslueger, Lucia; Meir, Patrick W.Background and aims: Ancient Amazon soils are characterised by low concentrations of soil phosphorus (P). Therefore, it is hypothesised that plants may invest a substantial proportion of their resources belowground to adjust their P-uptake strategies, including root morphological, physiological (phosphatase enzyme activities) and biotic (arbuscular mycorrhizal (AM) associations) adaptations. Since these strateg...
Drought-mortality relationships for tropical forests
Phillips, Oliver L.; Van Der Heijden, Geertje M.F.; Lewis, Simon L.; Lopez-Gonzalez, Gabriela; Aragao, L. E.O.C.; Lloyd, Jon; Malhi, Yadvinder SinghThe rich ecology of tropical forests is intimately tied to their moisture status. Multi-site syntheses can provide a macro-scale view of these linkages and their susceptibility to changing climates. Here, we report pan-tropical and regional-scale analyses of tree vulnerability to drought. We assembled available data on tropical forest tree stem mortality before, during, and after recent drought events, from 119...
Leaf-level photosynthetic capacity in lowland Amazonian and high-elevation Ande...
Bahar, Nur H.A.; Ishida, Francoise Yoko; Weerasinghe, Lasantha K.; Guerrieri, Rossella; O'Sullivan, Odhran S.; Bloomfield, Keith J.; Asner, Gregory P.We examined whether variations in photosynthetic capacity are linked to variations in the environment and/or associated leaf traits for tropical moist forests (TMFs) in the Andes/western Amazon regions of Peru. We compared photosynthetic capacity (maximal rate of carboxylation of Rubisco (Vcmax), and the maximum rate of electron transport (Jmax)), leaf mass, nitrogen (N) and phosphorus (P) per unit leaf area (M...
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...
Biome-specific effects of nitrogen and phosphorus on the photosynthetic charact...
null, Tomas; Ishida, Francoise Yoko; Feldpausch, Ted R.; Grace, John; Meir, Patrick W.; Saiz, Gustavo; Séné, Olivier; Schrodt, FranziskaPhotosynthesis/nutrient relationships of proximally growing forest and savanna trees were determined in an ecotonal region of Cameroon (Africa). Although area-based foliar N concentrations were typically lower for savanna trees, there was no difference in photosynthetic rates between the two vegetation formation types. Opposite to N, area-based P concentrations were—on average—slightly lower for forest trees; a...
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...