A5014279211- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Insect and Pesticide Research
- Insect and Arachnid Ecology and Behavior
- Crop Yield and Soil Fertility
- Soil and Unsaturated Flow
- Agriculture, Soil, Plant Science
- Insect-Plant Interactions and Control
- Plant and animal studies
- Forest Insect Ecology and Management
- Climate change and permafrost
- Insect Resistance and Genetics
- Phosphorus and nutrient management
- Plant nutrient uptake and metabolism
- Peatlands and Wetlands Ecology
- Botany and Plant Ecology Studies
- Entomopathogenic Microorganisms in Pest Control
- Bee Products Chemical Analysis
- Bioenergy crop production and management
- Forest Biomass Utilization and Management
- Soil erosion and sediment transport
- Phytochemistry and Biological Activities
- Industrial Gas Emission Control
- Insect Pest Control Strategies
- Flowering Plant Growth and Cultivation
Agriculture and Agri-Food Canada
2022-2025
University of Alberta
2017-2023
Fooyin University
2023
Cornell University
2001-2005
Iowa State University
1997-2000
Pennsylvania State University
1999
Abstract The greenhouse gas (GHG) balance of boreal peatlands in permafrost regions will be affected by climate change through disturbances such as thaw and wildfire. Although the future GHG including ponds is dominated exchange both carbon dioxide (CO 2 ) methane (CH 4 ), disturbance impacts on fluxes potent nitrous oxide (N O) could contribute to shifts net radiative balance. Here, we measured monthly (April October) N O, CH , CO from three sites located across sporadic discontinuous zones...
Abstract Crop rotations are considered a promising strategy for mitigating greenhouse gas (GHG) emissions and enhancing soil organic matter in agricultural land. However, studies often focused solely on either GHG or carbon (SOC) changes, rather than integrating both indicators. We conducted 4‐year (2018–2021) crop rotation study to examine effects of six systems three ecoregions (sub‐humid, sub‐semiarid, semiarid) emissions, SOC C footprints Saskatchewan, Canada. The include (i) control,...
Abstract. Reductions in N2O emissions from nitrification inhibitors (NI) are substantial but remain uncertain because measurements of highly variable and discontinuous. Mathematical modelling may offer an opportunity to estimate these reductions if the processes causing variability can be accurately simulated. In this study, effect NI was simulated with a simple, time-dependent algorithm slow NH4+ oxidation ecosystem model ecosys. Slower modelled caused increases soil concentrations NO3-...
Adult Diabroticites including western corn rootworm (WCR), Diabrotica virgifera LeConte, consume pollen of corn, squash, sunflower, and other species. Short-chain neutral amino acids in methanol-water extracts have been previously identified our laboratory as strong phagostimulants for Diabrotica. Bioassay-driven fractionation was used to characterize the interacting lipid midpolarity adult WCR Giant Gray Stripe Helianthus annuus L., pollen. Lipids rich omega3-linolenic acid triglycerides,...
Abstract. Varroa destructor is a parasitic mite of the honey bee species Apis cerana Fabr . and A. mellifera L. Mature females reproduce on immature stages their hosts, producing more viable female offspring drone hosts than worker hosts. Thus, drones are likely to be infested with mites workers. To investigate hypothesis that differences in host chemistries underlie biased distribution between brood, arrestment responses solvent extracts number stimuli normally encountered by during its...
Applying abundant manure to soils can accelerate nitrogen (N) transformations and nitrous oxide (N 2 O) emissions. We conducted a laboratory incubation examine the turnover of labile N in manured soils. Soils were collected from agricultural fields that had recently received spring-injected liquid dairy with or without admixing nitrification inhibitors. Bands interbands plots incubated separately. Time courses ammonium (NH 4 + ) nitrate (NO 3 − used derive contrast zero-, first-,...
Ecosys is an hourly time-step model with multiple canopy and soil layers that provide a framework for simulated plant microbial populations to acquire, transform exchange resources (energy, water, C, N P).The constructed from algorithms representing basic physical, chemical biological processes determine process rates in interacting within complex biomes.These interact simulate ecosystem behaviour across wide range of spatial scales.The designed represent terrestrial ecosystems under natural...
Abstract. Reductions in N2O emissions from nitrification inhibitors (NI) are substantial, but remain uncertain because measurements of highly variable and discontinuous. Mathematical modelling may offer an opportunity to estimate these reductions if the processes causing variability can be accurately simulated. In this study, effect NI was simulated with a simple, time-dependent algorithm slow NH4+ oxidation ecosystem model ecosys. Slower modelled caused increases soil...
<p>Thaw-induced N<sub>2</sub>O emissions have been shown to account for 30-90% of in agricultural fields. Due the climate change, increased precipitatio is expected fall and winter seasons certain regions. As a result, this would turn enhance thaw-induced aggravate change. A mesocosm study was conducted investigate production sources from soils under elevated soil moisture contents response simulated fall-freeze-thaw cycle. Treatments included two...
Abstract Increasing contributions of nitrous oxide (N 2 O) from agriculture to the atmosphere is a concern. We quantified N O emissions barley fields after repeated injections liquid manure in Central Alberta, Canada. Manure alone was injected fall or spring, and we also evaluated two nitrification inhibitors (NIs: nitrapyrin DMPP) admixed with manure. Flux measurements were done surface chambers soil thawing freezing. Soil moisture, ammonium nitrate repeatedly measured. Across all...