Section 37
Chapter 36,690

Emissions of nitrous oxide from boreal agricultural mineral soils- Statistical models based on measurements

Regina, K.; Kaseva, J.; Esala, M.

Agriculture, Ecosystems and Environment 164: 131-136


DOI: 10.1016/j.agee.2012.09.013
Accession: 036689903

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This study compiles data of nitrous oxide (N2O) emissions from 13 fields on mineral soils in Finland with differing soil type, crop and management. Measurements using the chamber technique were conducted for periods of 1 3years on each field in 2000 2009. The annual emissions varied between 0.12 and 12kgN2O-Nha?1 yr?1 and the emission rates were higher for annual compared to perennial crops. Statistical mixed models were derived based on the measured emissions of N2O and background variables. Environmental and management data available for the analysis were the crop, fertilizer rate, type of fertilizer, soil characteristics and weather data. Models with the fertilizer rate and type of crop (annual/perennial) as variables were selected as the simplest method to estimate the flux of N2O from mineral agricultural soils. The effect of fertilizer type (mineral/organic) can be added to obtain a more detailed model. In the case of manures, the amount of mineral nitrogen was better related to N2O flux than the amount of total nitrogen. These models give realistic estimates of N2O fluxes in boreal conditions with frozen soils in the winter, frequently renewed grasslands and spring-sown crops as majority of the annual crops. Year-round N2O measurements on boreal mineral agricultural soils during 10years were compiled. N2O emissions were higher from annual than from perennial crops. The long non-vegetated period increases N2O emissions in the boreal region compared to other regions. Annual N2O emissions can be estimated using statistical models with the effect of crop type and fertilizer rate.

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