A5052362122- Plant Water Relations and Carbon Dynamics
- Geography and Environmental Studies
- Hydrology and Watershed Management Studies
- Conservation, Biodiversity, and Resource Management
- Soil erosion and sediment transport
- Environmental and biological studies
- Fish biology, ecology, and behavior
- Climate variability and models
- Ecology and Vegetation Dynamics Studies
- Flood Risk Assessment and Management
- Soil Management and Crop Yield
- Soil Moisture and Remote Sensing
- Land Use and Ecosystem Services
- Groundwater and Isotope Geochemistry
- Remote Sensing in Agriculture
- Environmental and Cultural Studies in Latin America and Beyond
- Fire effects on ecosystems
- Tailings Management and Properties
- Soil Carbon and Nitrogen Dynamics
- Tree-ring climate responses
- Forest ecology and management
- Mine drainage and remediation techniques
- Heavy metals in environment
- Soil and Unsaturated Flow
- Precipitation Measurement and Analysis
National Institute for Space Research
2015-2024
Universidade de São Paulo
2009-2013
Universidade Federal do Tocantins
2009
Centro de Tecnologia Mineral
2001
Significance The Amazonian tropical forests have been disappearing at a fast rate in the last 50 y due to deforestation open areas for agriculture, posing high risks of irreversible changes biodiversity and ecosystems. Climate change poses additional stability forests. Studies suggest “tipping points” not be transgressed: 4° C global warming or 40% total deforested area. regional development debate has focused on attempting reconcile maximizing conservation with intensification traditional...
We investigated the seasonal patterns of water vapor and sensible heat flux along a tropical biome gradient from forest to savanna. analyzed data network towers in Brazil that were operated within Large‐Scale Biosphere‐Atmosphere Experiment Amazonia (LBA). These tower sites included humid semideciduous forest, transitional floodplain (with physiognomies cerrado), cerrado sensu stricto. The mean annual at all ranged 20 38 Wm −2 , was generally reduced wet season increased late dry season,...
Abstract The possibility that the Amazon forest system could soon reach a tipping point, inducing large-scale collapse, has raised global concern 1–3 . For 65 million years, Amazonian forests remained relatively resilient to climatic variability. Now, region is increasingly exposed unprecedented stress from warming temperatures, extreme droughts, deforestation and fires, even in central remote parts of 1 Long existing feedbacks between environmental conditions are being replaced by novel...
Abstract Non-structural carbohydrates (NSC) are major substrates for plant metabolism and have been implicated in mediating drought-induced tree mortality. Despite their significance, NSC dynamics tropical forests remain little studied. We present leaf branch data 82 Amazon canopy species six sites spanning a broad precipitation gradient. During the wet season, total (NSC T ) concentrations both organs were remarkably similar across communities. However, its soluble sugar (SS) starch...
The present study focuses on the impacts of extreme drought and flooding situations in Amazonia, using level/discharge data from some rivers Amazon region as indicators impacts. last 10 years have featured various "once a century" droughts floods basin, which affected human natural systems region. We assess history such hazards based river data, discuss observed terms vulnerability systems, well adaptation strategies implemented by regional local governments to cope with them. A critical...
Abstract Recent studies using water isotopes have shown that trees and streams appear to return distinct pools the hydrosphere. Cryogenically extracted plant soil isotopic signatures diverge from meteoric lines, suggesting plants would preferentially use bound water, while mobile infiltrates recharges groundwater feeds streamflow all plots on lines. These findings been described under “two worlds” (TWW) hypothesis. In spite of growing evidence for TWW hypothesis, several questions remain...
Reducing uncertainties in the response of tropical forests to global change requires understanding how intra- and interannual climatic variability selects for different species, community functional composition ecosystem functioning, so that events differing frequency severity can be predicted. Here we present an extensive dataset hydraulic traits dominant species two Amazon with contrasting precipitation regimes - low seasonality forest (LSF) high (HSF) relate them El Niño-Southern...
Abstract Severe hydrological droughts in the Amazon have generally been associated with strong El Niño events. More than 100 years of stage record at Manaus harbour confirms that minimum water levels coincide intense warming tropical Pacific sea waters. During 2005, however, experienced a severe drought which was not an event. Unless what usually occurs during events, when negative rainfall anomalies affect central and eastern drainage basin; deficiencies 2005 were spatially constrained to...
This article discusses seasonal and interannual variations of the evapotranspiration (ET) rates in Bananal Island floodplain, Brazil. Measurements included ET sensible heat flux using eddy covariance method, atmospheric forcings (net radiation, Rn, vapor pressure deficit, VPD, wind speed air temperature), soil moisture profiles, groundwater level flood height, taken from November 2003 to December 2006. For hydrological years (October‐September) 2003/2004, 2004/2005 2005/2006, accumulated...
Abstract Tropical forests are recognized for their role in providing diverse ecosystem services (ESs), with carbon uptake the best recognized. The capacity of tropical to provide ESs is strongly linked enormous biodiversity. However, causal relationships between biodiversity and poorly understood. This may be because often translated into species richness. Here, we argue that focusing on multiple attributes biodiversity—structure, composition, function—will make clearer. In this review,...
The Atlantic forest is one of the world's major tropical biomes due to its rich biodiversity. Its vast diversity plant species poses challenges in floristic surveys. Fourier transform infrared spectroscopy (FTIR) enables rapid and residue-free data collection, providing diverse applications organic sample analysis. FTIR spectra quality depends on preparation methodology. However, no research methodology for taxonomy has been conducted with tree species. Hence, this study addresses influence...
ABSTRACT Knowledge about water resources is critical for climate adaptation in face of long-term changes and more frequent extreme events occurrence. During the major droughts 2005 2010, a large epicenter was located southwestern Amazon over Purus River Basin. In this sense, we conducted hydrological simulation basin to assess change impacts on its throughout 21st century. The balance simulated using Distributed Hydrological Model (MHD-INPE). future projections were by regional ETA-INPE...
Several studies have explored the linkages between phenology and ecosystem productivity across Amazon basin. However, few focused on flooded forests, which correspond to c.a. 14% of In this study, we assessed seasonality (gross primary productivity, GPP) from eddy covariance measurements, environmental drivers phenological patterns obtained field (leaf litter mass) satellite measurements (enhanced vegetation index (EVI) Moderate Resolution Imaging Spectroradiometer/multi-angle implementation...
We investigated the water use of Caatinga vegetation, largest seasonally dry forest in South America. identified and analysed environmental phenological drivers woody species their relationship with transpiration. To monitor evolution, we used remote sensing indices at different spatial temporal scales: normalized difference vegetation index (NDVI), soil adjusted (SAVI), green chromatic coordinate (GCC). represent phenology, GCC extracted from in-situ automated digital camera images;...
The oxidation of iron sulphides in dredged sediments can be a source long-term contamination surface and underground water. adverse effects are related to decrease the ability soil retain heavy metals, which is caused by acidification. Laboratory tests were conducted, pH variations consequent release especially Zn, Cu, Pb, into solution monitored over time. rate pyrite was determined based on sulphate production rate, through stoichiometry reaction. Samples from Jacarepaguá lagoon complex,...
Abstract Soil moisture plays a key role in hydrological, biogeochemical, and energy budgets of terrestrial ecosystems. Accurate soil measurements remote ecosystems such as the Amazon are difficult limited because logistical constraints. Time domain reflectometry (TDR) sensors widely used to monitor require calibration convert TDR's dielectric permittivity measurement ( K ) volumetric water content (θ v ). In this study, our objectives were develop field‐based TDR an old‐growth upland forest...
The availability of accurate rainfall data with high spatial resolution, especially in vast watersheds low density ground-measurements, is critical for planning and management water resources can increase the quality hydrological modeling predictions. In this study, we used two classical methods: optimal interpolation successive correction method (SCM), merging ground-measurements satellite estimates. Cressman Barnes schemes have been SCM order to define error covariance matrices. bias has...