A5077224467- Silicon Effects in Agriculture
- Geochemistry and Elemental Analysis
- Soil erosion and sediment transport
- Hydrology and Watershed Management Studies
- Geology and Paleoclimatology Research
- Arsenic contamination and mitigation
- Soil and Water Nutrient Dynamics
- Geomagnetism and Paleomagnetism Studies
- Aeolian processes and effects
- Invertebrate Taxonomy and Ecology
- Clay minerals and soil interactions
- Heavy metals in environment
- Urban Stormwater Management Solutions
- Marine and coastal ecosystems
- Soil and Unsaturated Flow
- Environmental DNA in Biodiversity Studies
- Integrated Water Resources Management
- Climate change and permafrost
- Mollusks and Parasites Studies
- Hydrology and Sediment Transport Processes
- Flood Risk Assessment and Management
- Species Distribution and Climate Change
- Smart Materials for Construction
- Fish Ecology and Management Studies
- Soil Carbon and Nitrogen Dynamics
Flemish Institute for Technological Research
2024
Province of Antwerp
2022
Earthwatch Europe
2017-2021
KU Leuven
2009-2019
Lund University
2013-2017
Quaternary Research Association
2014
University of Antwerp
2013
The silicon isotope composition of biogenic silica (δ30SiBSi) in the ocean is a function δ30Si available dissolved Si (DSi; H2SiO4), degree utilisation DSi, and, for some organisms, concentration DSi. This makes δ30SiBSi sediment archives promising proxy past DSi concentrations and utilisation. At steady-state, mean must equal weighted average inputs, majority which are continental origin. Variation functioning cycle on timescales similar to residence time (~ 10 ka) may therefore contribute...
Abstract Impact studies of catchment management in the developing world rarely include detailed hydrological components. Here, changes response a 200‐ha north Ethiopia are investigated. The included various soil and water conservation measures such as construction dry masonry stone bunds check dams, abandonment post‐harvest grazing, establishment woody vegetation. Measurements at outlet indicated runoff depth 5 mm or coefficient (RC) 1·6% rainy season 2006. Combined with measurements plot...
Biosilicification has driven variation in the global Si cycle over geologic time. The evolution of different eukaryotic lineages that convert dissolved (DSi) into mineralized structures (higher plants, siliceous sponges, radiolarians and diatoms) a secular decrease DSi ocean leading to low concentrations seen today. Recent studies, however, have questioned timing previously proposed for decreases concentration changes through deep time, which would major implications cycling carbon other key...
Abstract. Human land use changes perturb biogeochemical silica (Si) cycling in terrestrial ecosystems. This directly affects Si mobilisation and storage influences export from the continents, although magnitude of impact is unknown. A major reason for our lack understanding that very little information exists on how amorphous (ASi) soils. We have quantified compared total alkali-extracted (PSia) easily soluble (PSie) pools at four sites along a gradient anthropogenic disturbance southern...
Abstract An overall approach to assess the effectiveness of soil conservation measures at catchment scale is comparison sediment budgets before and after implementation a management programme. In May Zeg‐zeg (187 ha) in Tigray, north Ethiopia, integrated has been implemented since 2004: stone bunds were built whole catchment, vegetation was allowed re‐grow on steep slopes other marginal land, stubble grazing abandoned, check dams gullies. Land use mapped analysed for 2000 2006, whereby...
Abstract. Colluvial soils are enriched in soil organic carbon (SOC) comparison to the of upslope areas due deposition and progressive burial SOC. This SOC has important implications for global cycle, but long-term dynamics buried remain poorly constrained. We addressed this issue by determining efficiency (i.e. fraction originally deposited that is preserved colluvial deposits) as well stability soils. quantified turnover rate establishing sediment chronologies. The was derived from...
Summary The primary source of dissolved silicon ( S i: DSi ) is the weathering silicate minerals. In recent years, it has been shown that Si cycling through vegetation creates a more soluble pool in soil, as amorphous ASi deposits plants (phytoliths) are returned to soil litter. Amorphous accumulation soils depends on number factors, including land use. addition biogenic fraction, contain other non‐biogenic and sorbed fractions could contribute significantly export rivers, but hitherto these...
The Ganges is one of the world's largest rivers and lies at heart a body literature that investigates interaction between mountain orogeny, weathering global climate change. Three regions can be recognised in basin, with Himalayan orogeny to north plateaus peninsular India south together delimiting alluvial plain. Despite constituting approximately 80% processes peninsula plain have received little attention. Here we present an analysis 51 water samples along transect plain, including all...
Abstract The biogeochemical cycling of silicon (Si) along the land‐to‐ocean continuum is studied by a variety research fields and for scientific reasons. However, there an increasing need to refine methodology underlying assumptions used determine biogenic silica (BSi) concentrations. Recent evidence suggests that contributions nonbiogenic sources Si dissolving during alkaline extractions, not corrected standard silicate mineral dissolution correction protocols, can be substantial. ratio...
The involvement of volunteers in aspects freshwater research and monitoring has a long history. However, the advent smart technology access to internet opened up possibility mass public participation science, termed citizen science. potential science generate data over wider spatial temporal scales than conventional approaches is well recognized. as field matured, more attention being given participant journey, how practitioners can maximize engagement. papers this special series on are...
Abstract Sediments mobilized by interrill erosion are often highly enriched in soil organic carbon (SOC) comparison to source soils. This selectivity may lead the preferential mobilization of SOC with specific properties, e.g., that is especially susceptible decomposition. then have important implications respect role global cycle. We addressed this issue investigating behavior different components field rainfall simulation experiments on arable fields loess‐derived characterized...
Conventional water quality monitoring has been done for decades in Lake Tanganyika, under different national and international programs. However, these projects utilized approaches, which were temporally limited, labour intensive costly. This study examines the use of citizen science to monitor dynamics coliform concentrations Tanganyika as a complementary method statutory project-focused measurements. Persons five coastal communities (Kibirizi, Ilagala, Karago, Ujiji Gombe) trained...
In terrestrial ecosystems, a large portion (20-80%) of the dissolved Si (DSi) in soil solution has passed through vegetation. While importance this "terrestrial filter" is generally accepted, few data exist on pools and fluxes forest vegetation rate release from decomposing plant tissues. We quantified coarse woody debris (CWD) northern hardwood ecosystem (Watershed 6, W6) at Hubbard Brook Experimental Forest (HBEF) New Hampshire, USA. Previous work suggested that decomposition CWD may have...
Freshwater ecosystems are increasingly facing major global and local stressors, while monitoring surface water status by regulatory agencies is often limited financial political constraints. Citizen science–based approaches with robust quality control training can support decision-making. Herein, we outline the criteria used to develop a citizen science program for quality, based on standardized methodology designed Agenda 2030 indicator 6.3.2 EU’s Water Framework Directive. We explore...
Despite increasing recognition of the relevance biological cycling for Si in ecosystems and export from soils to fluvial systems, effects human cultivation on cycle are still relatively understudied. Here we examined stable isotope (δ30Si) signatures soil water samples across a temperate land use gradient. We show that – independent geological climatological variation there is depletion light isotopes intensive croplands managed grasslands relative native forests. Furthermore, our data...