A5058821317- Soil Carbon and Nitrogen Dynamics
- Soil Management and Crop Yield
- Plant nutrient uptake and metabolism
- Soil and Water Nutrient Dynamics
- Plant Water Relations and Carbon Dynamics
- Forest ecology and management
- Banana Cultivation and Research
- Environmental and biological studies
- Geography and Environmental Studies
- Agronomic Practices and Intercropping Systems
- Mycorrhizal Fungi and Plant Interactions
- Soil Geostatistics and Mapping
- Ecology and Vegetation Dynamics Studies
- Forest Ecology and Biodiversity Studies
- Plant responses to elevated CO2
- Peatlands and Wetlands Ecology
- Agricultural and Food Sciences
- Forest Management and Policy
- Fish biology, ecology, and behavior
- Legume Nitrogen Fixing Symbiosis
- Biocrusts and Microbial Ecology
- Coastal wetland ecosystem dynamics
- Bioenergy crop production and management
- Sustainability and Ecological Systems Analysis
- Groundwater and Watershed Analysis
Technical University of Munich
2022-2025
National Institute of Amazonian Research
2014-2025
Weihenstephan-Triesdorf University of Applied Sciences
2024
University of Exeter
2019-2022
Wageningen University & Research
2021
In-Q-Tel
2020
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...
Summary Tropical forest root characteristics and resource acquisition strategies are underrepresented in vegetation global models, hampering the prediction of forest–climate feedbacks for these carbon‐rich ecosystems. Lowland tropical forests often have globally unique combinations high taxonomic functional biodiversity, rainfall seasonality, strongly weathered infertile soils, giving rise to distinct patterns traits functions compared with higher latitude We provide a roadmap integrating...
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....
Vegetation processes are fundamentally limited by nutrient and water availability, the uptake of which is mediated plant roots in terrestrial ecosystems. While tropical forests play a central role global water, carbon, cycling, we know very little about tradeoffs synergies root traits that respond to resource scarcity. Tropical trees face unique set limitations, with rock-derived nutrients moisture seasonality governing many ecosystem functions, versus availability often separated spatially...
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...
Abstract There is increasing evidence to suggest that soil nutrient availability can limit the carbon sink capacity of forests, a particularly relevant issue considering today's changing climate. This question especially important in tropics, where most part Earth's plant biomass stored. To assess whether tropical forest growth limited by nutrients and explore N P limitations, we analyzed stem foliar elemental composition five widest trees per plot at two sites French Guiana after 3 years...
Abstract. Most land surface models (LSMs), i.e. the components of Earth system (ESMs), include representation nitrogen (N) limitation on ecosystem productivity. However, only a few these have incorporated phosphorus (P) cycling. In tropical ecosystems, this is likely to be important as N tends abundant, whereas availability rock-derived elements, such P, can very low. Thus, without P cycling, forest response in areas Amazonia rising atmospheric CO2 conditions remain highly uncertain. study,...
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 carbon (C), nitrogen (N), and P cycles ecosystems, building upon ecological stoichiometry processes that govern nutrient availability soils. Thus, understanding spatial distribution forms soil fundamental to initializing and/or evaluating include biogeochemical cycle P. One major...
Abstract Tropical ecosystems contain the world's largest biodiversity of vascular plants. Yet, our understanding tropical functional diversity and its contribution to global patterns is constrained by data availability. This discrepancy underscores an urgent need bridge gaps incorporating comprehensive root into datasets. Here, we provide a database characteristics. new database, TropiRoot 1.0, will be instrumental in evaluating array hypotheses pertaining ecology plant biogeography, both...
Fine roots mediate plant nutrient acquisition and growth. Depending on soil availability, plants can regulate fine root biomass morphological traits to optimise acquisition. Little is known, however, about the importance of these parameters influencing forest functioning. In this study, we measured responses additions gain a mechanistic understanding adaptations limitation in two tropical forests French Guiana, differing twofold their statuses. We analysed biomass, mean diameter (RD),...
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...
More than 60% of the Amazonian rainforest grows on old and weathered soil with low availability important rock-derived nutrients like phosphorus (P), efficient nutrient recycling is main source to maintain forest productivity. Thus, effect elevated CO2 atmospheric concentrations (eCO2) tree productivity (i.e., fertilization effect) may depend capacity plants access currently unavailable or increase acquisition efficiency. In some Amazon regions, high root proliferation in litter layer, where...
AbstractBackground: Coarse woody debris (CWD) is an essential component in tropical forest ecosystems and its quantity varies widely with types.Aims: Relationships among CWD, soil, structure other environmental factors were analysed to understand the drivers of variation CWD forests on different soil types across central Amazonia.Methods: To estimate stocks density dead wood debris, 75 permanent plots 0.5 ha size assessed along a transect that spanned ca. 700 km undisturbed from north Rio...
Abstract. Most Land Surface Models (LSMs), the land components of Earth system models (ESMs), include representation N limitation on ecosystem productivity. However only few these have incorporated phosphorus (P) cycling. In tropical ecosystems, this is likely to be particularly important as tends abundant but availability rock-derived elements, such P, can very low. Thus, without a P cycling, forest response in areas Amazonia rising atmospheric CO2 conditions remains highly uncertain....
Abstract The response of plants to increasing atmospheric CO 2 depends on the ecological context where are found. Several experiments with elevated (eCO ) have been done worldwide, but Amazonian forest understory has neglected. As central Amazon is limited by light and phosphorus, understanding how responds eCO important for foreseeing will function in future. In a natural Central Amazon, we installed four open‐top chambers as control replicates another under (+250 ppm above ambient levels)....
Abstract. Terrestrial biosphere models typically use the biochemical model of Farquhar, von Caemmerer, and Berry (1980) to simulate photosynthesis, which requires accurate values photosynthetic capacity different biomes. However, data on tropical forests are sparse highly variable due high species diversity, it is still uncertain how these respond nutrient limitation in terms C uptake. Tropical often grow soils low phosphorus (P) are, general, assumed be P rather than nitrogen (N) limited....
Plants growing in low phosphorus (P) soils, such as the predominant soils of Amazonia, are believed to devote more energy acquiring P through absorptive root production, symbionts, and exudates than plants fertile soils. Accounting for these costs vegetation models is essential, underestimating carbon (C) allocation nutrient acquisition may lead overestimating plant biomass growth. We developed a quantitative model test theoretical framework C across soil gradients. The considers four...
Abstract In tropical forests, free‐living Biological nitrogen (N) fixation (BNF) in soil and litter tends to decrease when substrate N concentrations increase, whereas increasing phosphorus (P) molybdenum (Mo) have been shown stimulate BNF rates. Yet, very few studies explored the effects of adding N, P, Mo together a single large‐scale fertilization experiment, which would teach us these elements constrain or limit activities. At two distinct forest sites French Guiana, we performed 3‐year...
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 carbon (C), nitrogen (N) and P cycles ecosystems, building upon ecological stoichiometry processes that govern nutrient availability soils. Thus, understanding spatial distribution forms soil fundamental to initialize and/or evaluate include biogeochemical cycle P. One major...