Plant Isotopes As Indicators Of N Cycling Processes In Agricultural Fields,
2010
Wilfrid Laurier University
Plant Isotopes As Indicators Of N Cycling Processes In Agricultural Fields, Eric Thuss
Theses and Dissertations (Comprehensive)
When nitrogen (N) availability exceeds biological demand, excess N, especially nitrate (NO3), may subsequently pollute ground and surface water. Agricultural practices in Southern Ontario typically supplement soils with organic and inorganic nutrients to aid in crop development, and employ various management techniques to limit nutrient loss. Excess N has several potential fates, which are controlled by the net effects of numerous N cycling reactions in the soil that are often difficult to measure directly. N cycling in soils is controlled in large part by soil moisture, as it affects microbial activity and soil redox conditions. Stable isotope geochemistry …
Spatial And Temporal Patterns In Nitrous Oxide Flux From Agricultural Soil In Southern Ontario,
2010
Wilfrid Laurier University
Spatial And Temporal Patterns In Nitrous Oxide Flux From Agricultural Soil In Southern Ontario, Michelle E. Zurbrigg
Theses and Dissertations (Comprehensive)
This research examines spatial and temporal variations in N2O flux from agricultural clay loam in corn-wheat and corn-oat rotations in southern Ontario. Gas samples are collected by the chamber method following significant precipitation events, thaw events, fertilization events, and otherwise every two weeks over a two-year period. Crop type appears to influence the magnitude of N2O emisions, whereas N2O fluxes do not otherwise seem to vary by landscape position. The seasonal pattern of in situ N2O flux at Strawberry Creek (SC) indicates that the highest N2O emissions are occuring during …
