A5047898761- Soil Carbon and Nitrogen Dynamics
- Soil Management and Crop Yield
- Soil and Water Nutrient Dynamics
- Plant nutrient uptake and metabolism
- Banana Cultivation and Research
- Plant Water Relations and Carbon Dynamics
- Plant responses to elevated CO2
- Atmospheric and Environmental Gas Dynamics
- Environmental and biological studies
- Agronomic Practices and Intercropping Systems
- Invertebrate Taxonomy and Ecology
- Environmental Impact and Sustainability
- Carbon Dioxide Capture Technologies
- Ecology and Vegetation Dynamics Studies
- Plant Micronutrient Interactions and Effects
- Geography and Environmental Studies
- Indigenous Health and Education
- Mycorrhizal Fungi and Plant Interactions
- Fish biology, ecology, and behavior
- Amazonian Archaeology and Ethnohistory
- Legume Nitrogen Fixing Symbiosis
- Land Use and Ecosystem Services
- Forest ecology and management
National Institute of Amazonian Research
2016-2025
Wageningen University & Research
2021-2025
Ancient Amazon soils are characterised by low concentrations of soil phosphorus (P). Therefore, it is hypothesised that plants may invest a substantial proportion their resources belowground to adjust P-uptake strategies, including root morphological, physiological (phosphatase enzyme activities) and biotic (arbuscular mycorrhizal (AM) associations) adaptations. Since these strategies energy demanding, we hypothesise trade-offs between morphological traits phosphatase exudation symbiotic...
Soil nutrient availability can strongly affect root traits. In tropical forests, phosphorus (P) is often considered the main limiting for plants. However, support P paradigm limited, and N cations might also control forests functioning. We used a large-scale experiment to determine how factorial addition of nitrogen (N), affected productivity traits related acquisition strategies (morphological traits, phosphatase activity, arbuscular mycorrhizal colonisation contents) in primary rainforest...
Abstract Purpose Large parts of the Amazon rainforest grow on weathered soils depleted in phosphorus and rock-derived cations. We tested hypothesis that this ecosystem, fine roots stimulate decomposition nutrient release from leaf litter biochemically by releasing enzymes, exuding labile carbon stimulating microbial decomposers. Methods monitored a Central tropical rainforest, where were either present or excluded, over 188 days added substrates (glucose citric acid) fully factorial design....
Abstract Purpose The tropical phosphorus cycle and its relation to soil (P) availability are a major uncertainty in projections of forest productivity. In highly weathered soils with low P concentrations, plant microbial communities depend on abiotic biotic processes acquire P. We explored the seasonality relative importance drivers controlling fluctuation common pools via such as litter production decomposition, phosphatase activity. Methods analyzed intra-annual variation using modified...
The impacts of elevated CO2 (eCO2) and alterations in nutrient availability on the carbon (C) storage capacity resilience Amazon forest remain highly uncertain. Carbon dynamics are controlled by multiple eco-physiological processes responding to environmental change, but we lack solid experimental evidence, hampering theory development thus representation ecosystem models. Here, present two ecosystem-scale manipulation experiments, be carried out Amazon, that examine tropical responses eCO2...
Abstract Extracellular enzymes (EE) play a vital role in soil nutrient cycling and thus affect terrestrial ecosystem functioning. Yet the drivers that regulate microbial activity, therefore EE remain under debate. In this study we investigate temporal variation of tropical terra-firme forest. We found activity peaked during drier season association with increased leaf litterfall, which was also reflected negative relationships between activities precipitation. Soil nutrients were weakly...
Abstract The stress‐dominance hypothesis (SDH) predicts that trait variation at the community level increases with availability of limiting resources, driving spatial and temporal patterns in above‐ground plant functional expression. Here, we test assumption SDH also applies to fine roots responding fluctuations soil resource availability. We monitored root mass traits associated acquisition, is specific length (SRL), tip abundance (SRTA) branching index (BI), related stress tolerance, such...
Abstract The response of lowland tropical forest on highly weathered P-limited soils to changes in atmospheric composition is likely be regulated by P-availability from litter and soil. Our aim was gain insight into possible mechanisms that may affect C sequestration. We collected soil samples along a transect Central Amazonia. examined properties, determined C, N, P contents performed density fractionation obtain organic-C, -N -P fractions. To assess microbial demand mineralization, we...
Abstract Background Tropical ecosystem functioning is influenced by seasonal fluctuations in precipitation, but the impact on soil nutrient cycling and microbial stoichiometry not fully understood. Aim This study investigates magnitude of intra‐annual availability biomass a tropical forest examining carbon (C), nitrogen (N), phosphorus (P) pools. Methods We analyzed total, extractable, C, N, P contents their Terra Firme Ferralsols, representative for central Amazon basin. Results observed...
Phosphorus (P) is hypothesised to be the main nutrient limiting forest productivity in tropical forests, but more recent evidence suggests that multiple nutrients could regulate functioning. Root functional trait expression represents a trade-off between maximising acquisition of resources and minimising root tissue construction maintenance. Therefore, if soil supply increased, plant investment biomass uptake strategies should decrease. To test this hypothesis we investigated how fine traits...
<p>The rapid rise in atmospheric CO<sub>2</sub> concentration over the past century is unprecedented. It has unambiguously influenced Earth’s climate system and terrestrial ecosystems. Elevated concentrations (eCO<sub>2</sub>) have induced an increase biomass thus, a carbon sink forests worldwide. assumed that eCO<sub>2</sub> stimulates photosynthesis plant productivity enhances...
Abstract Background It is relatively unknown if and how seasonal fluctuations of tropical microbial activity affect soil nutrient availability. In forests, economics are often considered to be centered around phosphorus, which might a limiting factor sustain crucial ecosystem processes, such as primary production decomposition organic material, thus in turn affecting processes associated dynamics the forest ecosystem. Aims We investigate extracellular hydrolytic enzyme activities nutrients...
Lowland tropical forests on highly weathered soils are generally expected to be predominantly P-limited. Their response increasing atmospheric CO 2 concentrations is therefore likely regulated by P-availability from litter and soil. To gain insight into possible mechanisms that may affect C sequestration, we collected soil samples at 10 locations along a transect in Central Amazonia examined properties, C, N, P contents, organic matter fractions N associated enzyme activities. We see clear...
Abstract Purpose . The tropical phosphorus-cycle and its impacts on phosphorus (P) availability are a major uncertainty in projections of forest productivity. In highly weathered soils with low P concentrations, plant microbial communities depend biological physical processes to acquire P. We explored the seasonality relative importance drivers controlling fluctuation common pools via such as litter production decomposition, soil phosphatase activity. Methods analyzed variation standard over...