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Pulse emissions of N2O and CO2 from an arable field depending on fertilization and tillage practice
Authors:Roland Fuß  ,Bernhard RuthRolf Schilling,Hagen ScherbJean Charles Munch
Affiliation:a Institute of Soil Ecology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
b Institute of Agricultural Climate Research, Johann Heinrich von Thünen Institute, Braunschweig, Germany
c Institute of Biomathematics and Biometry, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
Abstract:Nitrous oxide (N2O) emissions from soil are characterized by strong emission pulses. Although several mechanisms are known to create them, pulses are difficult to predict. Currently there is no established systematic way to identify pulses from long-term static chamber measurement results. In this study we suggest a simple algorithm for pulse identification. The algorithm was applied on time series of N2O and carbon dioxide (CO2) fluxes from a field study on the long-term impact of fertilization and tillage practice. Between 4 and 9% of N2O values were pulse values; 20-60% of total emission was emitted as pulses. Minimum tillage resulted in more pulses than plowing. In contrast, long-term averages of N2O losses from nitrogen (N) fertilizer were similar (3-4%) for all management practices. N2O emissions per crop yield for increased fertilization practice were double the values for reduced fertilization practice independent of tillage practice. CO2 emission pulses were scarce and there was no significant effect of management practice on CO2 pulse probability.
Keywords:N2O flux   CO2 flux   Pulse identification   Tillage practice   Fertilization practice
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