Deforestation and climate change have the capacity to alter rainfall regimes, water availability, surface‐atmosphere flux of energy tropical forests, especially in ecotonal, semi‐deciduous forests southern Amazon Basin, which experienced rapid regional warming deforestation over last three decades. To reduce uncertainty regarding current future flux, micrometeorological measurements latent ( Q e ) sensible heat h canopy conductance G c were combined with sap density F d maximum leaf g smax...

This study analyzed how seasonal and interannual variations in climate alter litter dynamics, including production, decomposition, accumulation. Monthly measurements of leaf, stem, reproductive (flower plus fruit) the forest floor mass were combined with a balance model to determine rates decomposition for semideciduous tropical located rain forest‐savanna ecotone southern Amazon Basin 2001–2007. Annual production varied between 8 10.5 Mg ha −1 , leaf accounted majority (∼70%) total...

Brazilian savanna (cerrado) is composed of vegetation and soil types that are spatially variable, links between cerrado physiognomy properties poorly understood. To reduce this uncertainty, we measured the plant community structure within located near Cuiaba, Mato Grosso, Brazil, varied in physical chemical properties. We hypothesized composition, including tree density, leaf area index (LAI), grass cover, species diversity would be highly correlated with C content fertility. Our results...

Measurements of soil CO 2 efflux, litter production, and the surface pool biomass were made over a 1 year period in tropical transitional forest near Sinop, Mato Grosso, Brazil with aim quantifying seasonal variation respiration decomposition annual contribution to efflux. Average efflux (±95% confidence interval (CI)) was 7.91 ± 1.16 g C m −2 d −1 . Soil highest during November–February wet season (9.15 0.90 ) lowest May–September dry (6.19 1.40 ), 60% explained by variations temperature...

The Pantanal is a biodiversity hotspot comprised of mosaic landforms that differ in vegetative assemblages and flooding dynamics. Tree islands provide refuge for terrestrial fauna during the period are particularly important to regional ecosystem structure. Little soil CO2 research has been conducted this region. We evaluated dynamics relation primary controlling environmental parameters (soil temperature water). Soil respiration was computed using gradient method situ infrared gas analyzers...

Abstract The Cerrado (savanna) and Pantanal (wetland) biomes of Central Western Brazil have experienced significant development activity in recent decades, including extensive land cover conversion from natural ecosystems to agriculture urban expansion. Cuiabá River transects the biome prior inundating large areas Pantanal, creating one largest biodiversity hot spots world. We measured dissolved organic carbon (DOC) optical absorbance fluorescence properties matter (DOM) 40 sampling...

Abstract The savanna vegetation of Brazil (Cerrado) accounts for 20–25% the land cover and is second largest ecosystem following Amazonian forest; however, Cerrado mass energy exchange still highly uncertain. We used eddy covariance to measure net CO 2 (NEE) grass‐dominated ( campo sujo ) over 3 years. hypothesized that soil water availability would be a key control seasonal interannual variations in NEE. Multiple regression indicated gross primary production (GPP) was positively correlated...

Abstract Aims We tested two mechanisms of adaptation to extreme hydrological stresses (flooding and drought) species making up a tropical wetland plant community by measuring leaf gas exchange water potential. hypothesized that anoxic conditions occur during flooding will decrease when compared the dry season, ‘super‐dominant’ have distinctive physiological advantage other plants within community. Location Northern Pantanal wetland, Private Natural Heritage Reserve Brazilian Social Service...

This study investigated the influences of regional climate and soil moisture conditions on vegetative reproductive cycles seven savanna forest vegetation communities Pantanal Mato-grossense. Circular analysis phenological data revealed occurrence interspecific synchronism seasonal responses in activities, with flowering patterns differing most between communities. Leaf shedding intensity events were closely linked to climatic seasonality. Over half individuals semideciduous or deciduous,...

Tropical forest trees are sensitive to climate variations, especially during anomalously warm and dry years that occur El Niño. However, species growth responses poorly understood. We measured annual stem of 27 different tree from upland seasonally flooded forests woodlands in the Cuiaba Basin Northern Pantanal Mato Grosso, Brazil. Stem increment was using plastic, spring-loaded dendrometer bands installed on 344 trees. Measurements were made between 2015 2019, which encompassed 2015–16 Niño...

Climate change has the capacity to alter water availability and litter production of tropical forests, which will rates carbon (C) cycling storage. We conducted a short-term field experiment in two hydrologically diverse forests Brazilian Pantanal assess initial response decomposition soil respiration (Rsoil) variations pool size. Total annual Rsoil significantly declined with removal increased addition, but rate was highest for plots where removed. positively related organic matter content...

Seasonal variations in cerrado nutrient availability and mineralization are poorly understood, especially for "hyperseasonal" cerrado, which experiences both flooding drought over an annual cycle. Here we quantified seasonal soil ammonium (NH4+), phosphorus (P), organic C (SOC) concentration net upland seasonally flooded forests of the Brazilian Pantanal, hypothesized that NH4+, P, SOC concentrations would decline under increase during dry season as becomes unsaturated. We found were...

Forest to pasture land use change following deforestation in Southern Amazonia can result changes stream water quality. However, some streams have riparian forest buffers, while others are dammed for farm ponds. Stream corridor management differential effects on hydrology and dissolved organic matter (DOM) characteristics. We examined rainfall-runoff patterns DOM characteristics a catchment with forested buffer, an adjacent impoundment. Total streamflow was 1.5 times higher the whereas...

Previous studies have shown that high levels of air pollutants may increase activity systemic lupus erythematosus (SLE). The aim this study is to analyze the association between originating from Brazilian Legal Amazon and SLE activity. This a retrospective longitudinal cohort with patients in General Hospital Cuiabá, Brazil. was measured using disease index (SLEDAI) data on quality-PM2.5 CO, published websites State Department Environment Center for Weather Forecasting Climate Studies. To...

The Pantanal is a large and diverse wetland whose main attribute the flood pulse that alters soil nutrients contributes to spread an invasive tree (Vochysia divergens Pohl) for more than four decades forming monospecific stands (locally known as Cambarazal).Our goal was investigate vegetation structure in seasonal flooded forest dominated by Vochysia Pohl Northern Brazilian Pantanal.There increasing of H+Al, H, OM, S, P, Al CEC concentration after flooding, but only Fe showed significant...

The Pantanal is the largest seasonal wetland in world with a landscape that consists of mosaic permanent aquatic habitats, and floodable non-floodable savannas, pastures forests. Drought events are expected to occur more frequently biome under future climate conditions, but effects land management hydrological extremes on have been poorly studied at spatial scales relevant local livestock. In this study, we measured CO2C fluxes using eddy covariance over year within cattle farm Brazilian...

Brazilian tropical savanna (referred to as Cerrado) has enormous structural variability ranging from tree- and shrub-free grasslands tall, dense forests that are found in both well-drained upland seasonally flooded (hyperseasonal) landforms. These hydrological variations cause aboveground carbon (C) storage, presumably nitrogen (N) phosphorus (P) storage fluxes; however, the effects of these on ecosystem N P pools fluxes less well-known. Thus, our objective was analyze for a spectrum Cerrado...

O objetivo deste trabalho foi (a) estimar o efluxo de CO2 do solo em uma Floresta Transição Amazônica Cerrado e área Pastagem localizadas no norte Mato Grosso, (b) verificar a influência da umidade temperatura solo, serrapilheira acumulada CO2. As medições foram realizadas com aparelho absorção por infravermelho (EGM/WMA-2 PP System, Hitchin Hertz, UK) maio/2005 abril/2006. Os valores médios na 5,45 4,95 µmolm-2s-1, respectivamente. Uma resposta satisfatória acumulada, ocorreu somente...

Abstract The Pantanal is the largest tropical wetland on planet, and yet little information available biome's carbon cycle. We used an automatic station to measure soil CO 2 concentrations oxidation‐reduction potential over 2014 2015 flood cycles of a tree island in that immune inundation during wetland's annual flooding. concentration profile was then estimate efflux two periods. In 2014, subsurface saturation at 0.30 m depth created conditions layer led buildup close 200,000 ppm below −300...