Nitrous oxide emissions from fertilised grassland: A 2-year study of the effects of N fertiliser form and environmental conditions
作者： H. Clayton , I. P. McTaggart , J. Parker , L. Swan , K. A. Smith
关键词: Loam 、 Nitrogen cycle 、 Ecology 、 Agronomy 、 Organic fertilizer 、 Environmental science 、 Ammonium 、 Calcium nitrate 、 Denitrification 、 Ammonium nitrate 、 Nitrous oxide
摘要: The aim was to investigate the effects of different N fertilisers on nitrous oxide (N2O) flux from agricultural grassland, with a view suggesting fertiliser practices least likely cause substantial N2O emissions, and assess influence soil environmental factors emissions. Replicate plots clay loam grassland were fertilised ammonium sulphate (AS), urea (U), calcium nitrate (CN), (AN), or cattle slurry supplemented AN three occasions in each 2 years. Frequent measurements made variables. loss N2O-N as percentage applied highest (SS) treatment U, lowest AS. temporal pattern losses for between Losses U lower than those CN spring, but higher summer. high summer fluxes associated water-filled pore space (WFPS) values. Fluxes also rose steeply temperature where WFPS mineral values not limiting. Total annual 2nd year, probably because rainfall pattern: 2.2, 1.4, 1.2, 1.1 0.4 SS, AN, AS, respectively. Application spring twice year gave an average emission factor 0.8% – application either individual fertiliser. We suggest that similar varied fertilisation practices, modified according crop type climatic conditions, might be employed minimise emissions land.
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