Browsing by Autor "Edmar Almeida de Oliveira"

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Increasing tree size across Amazonia
(Nature Portfolio, 2025) Adriane Esquivel‐Muelbert; Rebecca Banbury Morgan; Roel Brienen; Emanuel Gloor; Simon L. Lewis; Aurora Levesley; Gabriela López‐González; Edmar Almeida de Oliveira; Esteban Álvarez‐Dávila; Joey Talbot
Large range sizes link fast life histories with high species richness across wet tropical tree floras
(Nature Portfolio, 2025) Timothy R. Baker; Stephen Adu‐Bredu; Kofi Affum‐Baffoe; Shin‐ichiro Aiba; Perpetra Akite; Miguel N. Alexiades; Everton Cristo de Almeida; Edmar Almeida de Oliveira; Esteban Álvarez‐Dávila; Christian Amani
Soil pyrogenic carbon in southern Amazonia: Interaction between soil, climate, and above-ground biomass
(Frontiers Media, 2022) Edmar Almeida de Oliveira; Ted R. Feldpausch; Beatriz Schwantes Marimon; Paulo S. Morandi; Oliver L. Phillips; Michael I. Bird; Alejandro Araujo Murakami; Luzmila Arroyo; Carlos A. Quesada; Ben Hur Marimon
The Amazon forest represents one of the world’s largest terrestrial carbon reservoirs. Here, we evaluated the role of soil texture, climate, vegetation, and distance to savanna on the distribution and stocks of soil pyrogenic carbon (PyC) in intact forests with no history of recent fire spanning the southern Amazonia forest-Cerrado Zone of Transition (ZOT). In 19 one hectare forest plots, including three Amazonian Dark Earth (ADE, terra preta) sites with high soil PyC, we measured all trees and lianas with diameter ≥ 10 cm and analyzed soil physicochemical properties, including texture and PyC stocks. We quantified PyC stocks as a proportion of total organic carbon using hydrogen pyrolysis. We used multiple linear regression and variance partitioning to determine which variables best explain soil PyC variation. For all forests combined, soil PyC stocks ranged between 0.9 and 6.8 Mg/ha to 30 cm depth (mean 2.3 ± 1.5 Mg/ha) and PyC, on average, represented 4.3% of the total soil organic carbon (SOC). The most parsimonious model (based on AICc) included soil clay content and above-ground biomass (AGB) as the main predictors, explaining 71% of soil PyC variation. After removal of the ADE plots, PyC stocks ranged between 0.9 and 3.8 Mg/ha (mean 1.9 ± 0.8 Mg/ha –1 ) and PyC continued to represent ∼4% of the total SOC. The most parsimonious models without ADE included AGB and sand as the best predictors, with sand and PyC having an inverse relationship, and sand explaining 65% of the soil PyC variation. Partial regression analysis did not identify any of the components (climatic, environmental, and edaphic), pure or shared, as important in explaining soil PyC variation with or without ADE plots. We observed a substantial amount of soil PyC, even excluding ADE forests; however, contrary to expectations, soil PyC stocks were not higher nearer to the fire-dependent Cerrado than more humid regions of Amazonia. Our findings that soil texture and AGB explain the distribution and amount of soil PyC in ZOT forests will help to improve model estimates of SOC change with further climatic warming.
The pace of life for forest trees
(American Association for the Advancement of Science, 2024) Lalasia Bialic‐Murphy; Robert M. McElderry; Adriane Esquivel‐Muelbert; Johan van den Hoogen; Pieter A. Zuidema; Oliver L. Phillips; Edmar Almeida de Oliveira; Patricia Álvarez-Loayza; Esteban Álvarez‐Dávila; Luciana F. Alves
Tree growth and longevity trade-offs fundamentally shape the terrestrial carbon balance. Yet, we lack a unified understanding of how such trade-offs vary across the world's forests. By mapping life history traits for a wide range of species across the Americas, we reveal considerable variation in life expectancies from 10 centimeters in diameter (ranging from 1.3 to 3195 years) and show that the pace of life for trees can be accurately classified into four demographic functional types. We found emergent patterns in the strength of trade-offs between growth and longevity across a temperature gradient. Furthermore, we show that the diversity of life history traits varies predictably across forest biomes, giving rise to a positive relationship between trait diversity and productivity. Our pan-latitudinal assessment provides new insights into the demographic mechanisms that govern the carbon turnover rate across forest biomes.
Variation in wood density across South American tropical forests
(Nature Portfolio, 2025) Martin J. P. Sullivan; Oliver L. Phillips; David Galbraith; Everton Cristo de Almeida; Edmar Almeida de Oliveira; Jarcilene Silva de Almeida‐Cortez; Esteban Álvarez‐Dávila; Luciana F. Alves; Ana Andrade; Luiz E. O. C. Aragão