Carlos Alberto Quesada
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View article: The flask monitoring program for high-precision atmospheric measurements of greenhouse gases, stable isotopes, and radiocarbon in the central Amazon region
The flask monitoring program for high-precision atmospheric measurements of greenhouse gases, stable isotopes, and radiocarbon in the central Amazon region Open
Long-term and high-precision measurements of the mole fraction of greenhouse gases (GHG), together with their isotopic composition, are of fundamental importance to understand land–atmosphere interactions. Current flask monitoring programs…
View article: Multifaceted Assessment of Amazonian Tree Diversity Reveals Pervasive Impacts of Human Modification
Multifaceted Assessment of Amazonian Tree Diversity Reveals Pervasive Impacts of Human Modification Open
Tropical forests harbour the majority of tree species on the planet but are increasingly subjected to deforestation and human‐driven disturbances. Understanding how human modifications impact various facets of diversity—i.e., taxonomic, fu…
View article: The flask monitoring program for high-precision atmospheric measurements of greenhouse gases, stable isotopes, and radiocarbon in the central Amazon region
The flask monitoring program for high-precision atmospheric measurements of greenhouse gases, stable isotopes, and radiocarbon in the central Amazon region Open
Long-term and high-precision measurements of the mole fraction of greenhouse gases (GHG), together with their isotopic composition, are of fundamental importance to understand land-atmosphere interactions. Current flask monitoring programs…
View article: Moisture and soil depth govern relationships between soil organic carbon and oxalate-extractable metals at the global scale
Moisture and soil depth govern relationships between soil organic carbon and oxalate-extractable metals at the global scale Open
An important control on long-term soil organic carbon (SOC) storage is the adsorption of SOC by short-range-ordered (SRO) minerals. SRO are commonly quantified by measuring oxalate-extractable metals (M ox = Al ox + ½ Fe ox ), which many s…
View article: How long does carbon stay in a near-pristine central Amazon forest? An empirical estimate with radiocarbon
How long does carbon stay in a near-pristine central Amazon forest? An empirical estimate with radiocarbon Open
Amazon forests play a significant role in the global C cycle by assimilating large amounts of CO2 through photosynthesis and by storing C largely as biomass and soil organic matter. To evaluate the net budget of C in the Amazon, we must al…
View article: Reduced vegetation uptake during the extreme 2023 drought turns the Amazon into a weak carbon source
Reduced vegetation uptake during the extreme 2023 drought turns the Amazon into a weak carbon source Open
View article: Not just semantics: CO<sub>2</sub> fertilization can be a disturbance leading to worldwide forest degradation
Not just semantics: CO<sub>2</sub> fertilization can be a disturbance leading to worldwide forest degradation Open
Societal Impact Statement The physiological effects of increased atmospheric CO 2 (CO 2 fertilization) on intact forests are generally seen as a process that might buffer them against the impacts of climate change. However, CO 2 fertilizat…
View article: Perfis de fluxos turbulentos usados para a estimativa da altura da camada limite noturna na Amazônia Central
Perfis de fluxos turbulentos usados para a estimativa da altura da camada limite noturna na Amazônia Central Open
A Camada Limite Atmosférica (CLA) é uma porção da baixa troposfera que interage e é influenciada pela superfície. É um parâmetro chave para micrometeorologia, química da atmosfera e outras áreas de estudos. Contudo, a estimativa da altura …
View article: Cycling of dissolved organic nutrients and indications for nutrient limitations in contrasting Amazon rainforest ecosystems
Cycling of dissolved organic nutrients and indications for nutrient limitations in contrasting Amazon rainforest ecosystems Open
View article: Intra‐annual dynamics of soil and microbial C, N, and P pools in a Central Amazon Terra Firme forest
Intra‐annual dynamics of soil and microbial C, N, and P pools in a Central Amazon Terra Firme forest Open
Background Tropical ecosystem functioning is influenced by seasonal fluctuations in precipitation, but the impact on soil nutrient cycling and microbial stoichiometry is not fully understood. Aim This study investigates the magnitude of in…
View article: Tall tower observations of a northward surging gust front in central Amazon and its role in the mesoscale transport of carbon dioxide
Tall tower observations of a northward surging gust front in central Amazon and its role in the mesoscale transport of carbon dioxide Open
High‐frequency measurements obtained at two micrometeorological towers are investigated for a rare northward surging gust front that impacted the Amazon Tall Tower Observatory (ATTO), in central Amazon. The gust front originated from a dec…
View article: Comment on egusphere-2024-883
Comment on egusphere-2024-883 Open
Abstract. Amazon forests play a significant role in the global C cycle by assimilating large amounts of CO2 through photo- synthesis and storing C largely as biomass and soil organic matter. To evaluate the net …
View article: Correction to: Seasonal fluctuations of extracellular enzyme activities are related to the biogeochemical cycling of C, N and P in a tropical terra-firme forest
Correction to: Seasonal fluctuations of extracellular enzyme activities are related to the biogeochemical cycling of C, N and P in a tropical terra-firme forest Open
View article: How long does carbon stay in a near-pristine central Amazon forest? An empirical estimate with radiocarbon
How long does carbon stay in a near-pristine central Amazon forest? An empirical estimate with radiocarbon Open
Amazon forests play a significant role in the global C cycle by assimilating large amounts of CO2 through photo- synthesis and storing C largely as biomass and soil organic matter. To evaluate the net budget of C in the Amazon, we must als…
View article: Supplementary material to "How long does carbon stay in a near-pristine central Amazon forest? An empirical estimate with radiocarbon"
Supplementary material to "How long does carbon stay in a near-pristine central Amazon forest? An empirical estimate with radiocarbon" Open
View article: Effects of elevated CO2 on soil microbial communities in a tropical understory forest in the Central Amazon
Effects of elevated CO2 on soil microbial communities in a tropical understory forest in the Central Amazon Open
Soil microbial communities are central to understanding interactions between soil and climate change by controlling major carbon and nutrient fluxes, such as organic matter formation and decomposition. In addition, soil microbial com…
View article: Amazonian understory response to elevated CO2
Amazonian understory response to elevated CO2 Open
The response of plants to increasing atmospheric CO2 concentration depends on several factors such as life history of specific species, availability of water, nutrients and light, and the ecological context that the plants are found. Altho…
View article: Plant nutrient resorption efficiency in a Central Amazon rainforest
Plant nutrient resorption efficiency in a Central Amazon rainforest Open
Nutrient resorption efficiency (RE) occurs before leaf abscission, with nutrients being actively transported via phloem through abscission zones from senescent leaves to be used in other parts of the plant. It is an essential nutrient cons…
View article: In situ short‐term responses of Amazonian understory plants to elevated CO<sub>2</sub>
In situ short‐term responses of Amazonian understory plants to elevated CO<sub>2</sub> Open
The response of plants to increasing atmospheric CO 2 depends on the ecological context where the plants are found. Several experiments with elevated CO 2 (eCO 2 ) have been done worldwide, but the Amazonian forest understory has been negl…
View article: Reference maps of soil phosphorus for the pan-Amazon region
Reference maps of soil phosphorus for the pan-Amazon region Open
Phosphorus (P) is recognized as an important driver of terrestrial primary productivity across biomes. Several recent developments in process-based vegetation models aim at the concomitant representation of the carbon (C), nitrogen (N), an…
View article: Comment on essd-2023-272
Comment on essd-2023-272 Open
Abstract. Phosphorus (P) is recognized as an important driver of terrestrial primary productivity across biomes. Several recent developments in process-based vegetation models aim at the concomitant representation of the c…
View article: Supplementary material to "Reference maps of soil phosphorus for the pan-Amazon region"
Supplementary material to "Reference maps of soil phosphorus for the pan-Amazon region" Open
View article: Reference maps of soil phosphorus for the pan-Amazon region
Reference maps of soil phosphorus for the pan-Amazon region Open
Phosphorus (P) is recognized as an important driver of terrestrial primary productivity across biomes. Several recent developments in process-based vegetation models aim at the concomitant representation of the carbon (C), nitrogen (N) and…
View article: Carbon, nitrogen and phosphorous contents, related enzyme activities and organic matter fractions of litter and soil in a terra firme forest in Central Amazonia
Carbon, nitrogen and phosphorous contents, related enzyme activities and organic matter fractions of litter and soil in a terra firme forest in Central Amazonia Open
View article: Topography influence on turbulent profiles over the ATTO site
Topography influence on turbulent profiles over the ATTO site Open
The spatial representativeness of anemometric tower measurements and the underlying hypothesis of horizontal homogeneity of the atmospheric flows have long being questioned in the literature. Further, forest are rarely situated on uniform …
View article: Molecular transformation of dissolved organic matter in soils of contrasting tropical rainforest ecosystems is similar to temperate regions suggesting common processes
Molecular transformation of dissolved organic matter in soils of contrasting tropical rainforest ecosystems is similar to temperate regions suggesting common processes Open
The variability of the molecular composition of dissolved organic matter (DOM) in soils is predominantly explained by microbial mineralization and assimilation as well as interactions with mineral surfaces and soil organic matter (SOM). Fr…
View article: Turbulent Fluxes Within and Above the Amazon Roughness Sublayer
Turbulent Fluxes Within and Above the Amazon Roughness Sublayer Open
For tropical forests, such as the Amazon Forest, the turbulence intensity at the forest-atmosphere interface is high since in this region there is strong convective activity during the day and the aerodynamic roughness of the forest canopy…
View article: Seasonal fluctuations of extracellular enzyme activities are related to the biogeochemical cycling of C, N and P in a tropical terra-firme forest
Seasonal fluctuations of extracellular enzyme activities are related to the biogeochemical cycling of C, N and P in a tropical terra-firme forest Open
View article: Soil Δ15n Spatial Distribution is Primarily Shaped by Climatic Patterns in the Semiarid Caatinga, Northeast Brazil
Soil Δ15n Spatial Distribution is Primarily Shaped by Climatic Patterns in the Semiarid Caatinga, Northeast Brazil Open
View article: Capítulo 1: Historia Geológica y Geodiversidad de la Amazonía
Capítulo 1: Historia Geológica y Geodiversidad de la Amazonía Open
En este capítulo exploramos la forma como estas características evolucionaron a lo largo de una historia de tres mil millones de años, y mostramos que los períodos de separación continental seguidos por la formación de montañas finalmente …