Landscape and Seasonal Patterns of Nitrous Oxide Emissions in a Semiarid Region

摘要: As a prerequisite for quantification of annual N 2 O emissions at regional scale, this study was conducted to determine the landscape-scale patterns and seasonal fluctuations emission demonstrate linking relationships between large-scale controllers proximal factors emission. An area Black soil zone central Saskatchewan, Canada, stratified into three main textural areas: clay loam, fine sandy sandy. Within each area, representative sites were selected based on land use: unfertilized fertilized cropland, fallow, pasture, forest sites. A consistent pattern observed; footslope positions had higher fluxes than shoulder positions. The role topography is attributed its strong influence hydrologic pedologic processes in landscape, which, turn, regulate controlling microscale level. fluctuation influenced by precipitation. Pulses activity observed during summer, after rainfall events following fertilizer application, spring thaw. At lower fine-textured areas. general order evolved among uses < pasture fallow cropland. Our results showed importance developing spatially based, predictive factors. Linking these with integrative variables, such as texture use, provides means extrapolating from landscape scale.