A5069131175- Soil Management and Crop Yield
- Oil Palm Production and Sustainability
- Forest ecology and management
- Conservation, Biodiversity, and Resource Management
- Soil Carbon and Nitrogen Dynamics
- Environmental and biological studies
- Plant Water Relations and Carbon Dynamics
- Agricultural and Food Sciences
- Ecology and Vegetation Dynamics Studies
- Geography and Environmental Studies
- Agroforestry and silvopastoral systems
- Cassava research and cyanide
- Cocoa and Sweet Potato Agronomy
- Growth and nutrition in plants
- Agriculture and Rural Development Research
- Banana Cultivation and Research
- Agronomic Practices and Intercropping Systems
- Leaf Properties and Growth Measurement
- Plant responses to water stress
- Tree-ring climate responses
- Soil and Unsaturated Flow
- Soil erosion and sediment transport
- Fire effects on ecosystems
- Clay minerals and soil interactions
- Aluminum toxicity and tolerance in plants and animals
Amazon (United States)
2014-2024
Brazilian Agricultural Research Corporation
2012-2024
Amazon (Germany)
2024
Amazon Research Foundation
2005-2023
Centro de Estudos e Pesquisas em Educação, Cultura e Ação Comunitária
2016
Estácio (Brazil)
2016
Universidade Federal Rural da Amazônia
2016
University of Florida
2003-2012
Universidade Federal Rural do Rio de Janeiro
2002
Abstract The fate of tropical forests under future climate change is dependent on the capacity their trees to adjust drier conditions. withstand drought likely be determined by traits associated with hydraulic systems. However, data whether can when experiencing remain rare. We measured plant (e.g. conductivity and embolism resistance) system status leaf water potential, native safety margin) >150 from 12 genera (36 species) spanning a stem size range 14 68 cm diameter at breast height...
Summary The tropics are predicted to become warmer and drier, understanding the sensitivity of tree species drought is important for characterizing risk forests climate change. This study makes use a long‐term experiment in Amazon rainforest evaluate role leaf‐level water relations, leaf anatomy their plasticity response six genera. variables (osmotic potential at full turgor, turgor loss point, capacitance, elastic modulus, relative content saturated content) were compared between seasons...
Abstract Determining climate change feedbacks from tropical rainforests requires an understanding of how carbon gain through photosynthesis and loss respiration will be altered. One the key changes that may experience under future scenarios is reduced soil moisture availability. In this study we examine if both leaf dark acclimate following more than 12 years experimental deficit, via a through‐fall exclusion experiment ( TFE ) in eastern Amazonian rainforest. We find experimentally...
Abstract The absorption of atmospheric water directly into leaves enables plants to alleviate the stress caused by low soil moisture, hydraulic resistance in xylem and effect gravity on column, while enabling scavenge small inputs from leaf‐wetting events. By increasing availability water, supplying it top canopy (in a direction facilitated gravity), foliar uptake (FU) may be significant process determining how forests interact with climate, could alter our interpretation current metrics for...
Changes in land‐use and climate are likely to alter moisture substrate availability tropical forest soils, but quantitative assessment of the role resource constraints as regulators soil trace gas fluxes is rather limited. The primary objective this study was quantify effects on an Amazonian regrowth forest. We measured efflux carbon dioxide (CO 2 ), nitric oxide (NO), nitrous (N O), methane (CH 4 ) from response two experimental manipulations. In first, we increased during dry season by...
Transpiration from the Amazon rainforest generates an essential water source at a global and local scale. However, changes in function with climate change can disrupt this process, causing significant reductions precipitation across Amazonia, potentially We report only study of forest transpiration following long-term (>10 year) experimental drought treatment Amazonian forest. After 15 years receiving half normal rainfall, drought-related tree mortality caused total to decrease by 30%....
Summary Plant traits are increasingly being used to improve prediction of plant function, including demography. However, the capability predict demographic rates remains uncertain, particularly in context trees experiencing a changing climate. Here we present data combining 17 associated with structure, metabolism and hydraulic status, measurements long‐term mean, maximum relative growth for 176 from world’s longest running tropical forest drought experiment. We demonstrate that can mean...
*Fine root dynamics is widely recognized as an important biogeochemical process, but there are few data on fine growth and its response to soil resource availability, especially for tropical forests. *We evaluated the of altered availability water nutrients in a 20-yr-old forest regrowth eastern Amazonia. In one experiment dry season reduction moisture was alleviated by irrigation. other experiment, nutrient supply reduced litter removal. We used ingrowth core technique measure mass growth,...
Dry periods are predicted to become more frequent and severe in the future some parts of tropics, including Amazonia, potentially causing reduced productivity, higher tree mortality increased emissions stored carbon. Using a long-term (12 year) through-fall exclusion (TFE) experiment we test hypothesis that trees produce leaves adapted cope with levels water stress, by examining following leaf characteristics: area, thickness, mass per vein density, stomatal thickness palisade mesophyll,...
Summary CO 2 efflux from stems ( 2_stem ) accounts for a substantial fraction of tropical forest gross primary productivity, but the climate sensitivity this flux remains poorly understood. We present study 215 trees across wet and dry seasons, at world's longest running drought experiment site. show 27% increase in season droughted relative to control forest. This was driven by increasing 10–40 cm diameter. Furthermore, we that increases proportion maintenance growth respiration > 20...
Abstract Whether tropical trees acclimate to long‐term drought stress remains unclear. This uncertainty is amplified if accompanied by changes in other drivers such as the increases canopy light exposure that might be induced tree mortality or disturbances. Photosynthetic capacity, leaf respiration, non‐structural carbohydrate (NSC) storage and stomatal conductance were measured on 162 at world's longest running (15 years) forest experiment. We test whether surviving have altered strategies...
Abstract The expansion of oil palm (Elaeis guineensis Jacq.) cultivation in degraded areas has increased the Brazilian Amazon. Cultivation diversified agroforestry systems may be a relatively sustainable alternative to monocultures for crop expansion. Here, we evaluated effect on soil C, an important indicator quality production systems. We assessed: (1) whether these alter potassium permanganate oxidizable C content (POx‐C) and carbon management index (CMI); (2) how POx‐C varied among zones...
Abstract: Litterfall quantity and quality may respond to alterations in resource availability expected with ongoing land-use climate changes. Here, we quantify the effects of altered on non-woody litterfall (nitrogen phosphorus concentrations) eastern Amazonian forest regrowth (Brazil) through two multi-year experimental manipulations: (1) daily irrigation (5 mm d −1 ) during dry season; (2) fortnightly litter removal. Consistent other tropical data exhibited seasonal patterns, increasing...
Discovered in 1980 and unleashed an utter gold rush of the modern era, Serra Pelada was largest open-air mine Brazil. About 80,000 prospectors worked there until 1984, when pits were flooded. The environmental impact caused by mining inflicted irreversible damage to ecosystem, with formation a large lake piles waste rock sterile overburden, still evident 28 years after closed. This study aimed evaluate available pseudo total contents potentially toxic elements (PTEs), contamination pollution...
ABSTRACT Leaf‐litter decomposition is a major component of carbon and nutrient dynamics in tropical forest ecosystems, moisture availability widely considered to be influence on rates. Here, we report the results study leaf‐litter five tree species response dry‐season irrigation regrowth stand Brazilian Amazon; three experiments differing timing installation duration allowed for an improved resolution effects decomposition. We hypothesized that rates would faster under higher wet season...