A5045378992- Soil Carbon and Nitrogen Dynamics
- Clay minerals and soil interactions
- Peatlands and Wetlands Ecology
- Plant Diversity and Evolution
- Ecology and Vegetation Dynamics Studies
- Cassava research and cyanide
- Botanical Research and Applications
- Rangeland and Wildlife Management
- Healthcare Systems and Challenges
- Heavy metals in environment
- Plant Water Relations and Carbon Dynamics
- Rocket and propulsion systems research
- Radioactive element chemistry and processing
- Engineering Structural Analysis Methods
- Forest ecology and management
- Mechanical Engineering and Vibrations Research
- Geological formations and processes
- Geology and Paleoclimatology Research
- Invertebrate Taxonomy and Ecology
- Clinical Nutrition and Gastroenterology
- Soil and Unsaturated Flow
- Plant Ecology and Soil Science
University of California, Davis
2024
Lawrence Berkeley National Laboratory
2022-2024
University of Zurich
2023
University of Lausanne
2016-2021
Chrysler (Canada)
2014
Soils play an essential role in the global cycling of carbon and understanding stabilisation mechanisms behind preservation soil organic (SOC) pools is globally recognised significance. Until recently, research into SOC has predominantly focused on acidic environments interactions between aluminium (Al) or iron (Fe). The calcium (Ca) have typically received less attention, with fewer studies conducted alkaline soils. Although it widely been established that exchangeable Ca (CaExch)...
Geochemical indicators are emerging as important predictors of soil organic carbon (SOC) dynamics, but evidence concerning the role calcium (Ca) is scarce. This study investigates Ca prevalence in SOC accumulation by comparing otherwise similar sites with (CaCO3-bearing) or without carbonates (CaCO3-free). We measured content and matter quality (C stable isotope composition, expressed δ13C values, thermal stability) bulk samples. then used sequential sonication density fractionation (DF) to...
Soil research in temperate to cool and humid regions has typically focused on acidic soils; there been relatively little investigation of the effects calcium carbonate (CaCO3) unamended soil properties or function these environments. The object this study was characterise small amounts CaCO3 pedogenic trajectories biogeochemistry a subalpine valley Switzerland. To isolate influence CaCO3, six profiles were selected that had developed under almost identical conditions for formation, i.e....
Organo-mineral and organo-metal associations play an important role in the retention accumulation of soil organic carbon (SOC). Recent studies have demonstrated a positive correlation between calcium (Ca) SOC content range types. However, most these focused on soils that contain carbonate (pH > 6). To assess importance Ca-SOC lower pH soils, we investigated their physical chemical interaction grassland Point Reyes National Seashore (CA, USA) at spatial scales. Multivariate analyses our bulk...
Global temperatures could increase by approximately 4°C until 2100, according to IPCC climate scenarios, causing surface and subsoil will warm in synchrony with the atmosphere. This warming is predicted accelerate soil carbon loss greenhouse gas release, but also change composition of organic matter ways that affect its cycling future vulnerability. important because despite low concentrations, subsoils store more than half total global carbon. However, it remains largely unknown...
Our understanding of mechanisms governing soil organic matter (OM) stability is evolving. It gradually becoming accepted that OM not primarily regulated by the molecular structure plant inputs, but instead biotic and abiotic properties edaphic environment. Moreover, several experimental studies conducted in artificial systems have suggested regulating may differ with depth profile. Up to now however, there very limited field-scale evidence regarding hierarchy controls on dynamics their...
The Oxalate-Carbonate Pathway (OCP) is a biogeochemical process that transfers atmospheric CO2 into the geologic reservoir as CaCO3; however, until now all investigations on this have focused species with limited food benefits. This study evaluates potential OCP associated Brosimum alicastrum, Neotropical agroforestry (ca. 70–200 kg-nuts yr−1), in calcareous soils of Haiti and Mexico. Enzymatic analysis demonstrated significant concentrations calcium oxalate (5.97 % D.W.) were B. alicastrum...
Abstract. Calcium (Ca) may contribute to the preservation of soil organic carbon (SOC) in more ecosystems than previously thought. Here we provide evidence that Ca is co-located with SOC compounds are enriched aromatic and phenolic groups, across different acidic soil-types locations ecosystem properties. In turn, this co-localised fraction Ca-SOC removed through cation-exchange, association then only re-established during decomposition presence (Ca addition incubation). Thereby highlighting...
The impact of warming on the soil organic carbon (SOC) cycle and its potential positive feedback with increasing atmospheric CO2 concentrations is global concern. Earth System Models currently predict that will increase efflux faster than net primary productivity (Crowther et al., 2016); yet there are still large uncertainties associated these modelled estimates, which can be reduced by process-based observations from whole-soil experiments. To identify influence 7.5 years +4°C SOC...
Abstract Grasslands are one of the most common land‐cover types, providing important ecosystem services globally, yet few studies have examined grassland critical‐zone functioning throughout hillslopes. This study characterised a coastal over small hillslope at Point Reyes National Seashore, California, using multidisciplinary techniques, combining remotely‐sensed, geophysical, plant, and soil measurements. Clustering techniques delineated area into four landscape zones, up‐, mid‐,...