Browsing by Autor "Paulo S. Morandi"

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Sensitivity of South American tropical forests to an extreme climate anomaly
(Nature Portfolio, 2023) Amy C. Bennett; Thaiane R. Sousa; Abel Monteagudo‐Mendoza; Adriane Esquivel‐Muelbert; Paulo S. Morandi; Fernanda Coelho de Souza; Wendeson Castro; Luisa Fernanda Duque; Gerardo Flores Llampazo; Rubens Manoel dos Santos
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.
Tree diversity and above-ground biomass in the South America Cerrado biome and their conservation implications
(Springer Science+Business Media, 2018) Paulo S. Morandi; Beatriz Schwantes Marimon; Ben Hur Marimon; J. A. Ratter; Ted R. Feldpausch; Guarino Rinaldi Colli; Cássia Beatriz Rodrigues Munhoz; Manoel Cláudio da Silva Júnior; Edson de Souza Lima; Ricardo Flores Haidar