Nitrous oxide (N2O) emissions from several Italian croplands along a latitudinal gradient were analyzed and the fertilizer induced emission (FIE) factor, for each single fertilization event, was calculated. Data show that the average emission factor was between 0.7 and 0.3 %, hence much lower than the IPCC EF used for temperate croplands. The relationship between N2O production and applied N fertilization rate was exponential and not linear, although the rate of exponential increase was lower than previously reported. Maximum N2O emission rate was correlated with magnitude of the total FIE, whereas it was inversely related to the length of FIE, which varied from a minimum of 8–56 days. Overall data suggest that the internationally applied emission factors for temperate crops, which are empirically derived from sites with cooler and wetter climates than the Mediterranean, would overestimate N2O emissions for Italian crops, in particular those developing between spring and summer
Castaldi, S.; Alberti, G.; Bertolini, T.; Forte, A.; Miglietta, F.; Valentini, R.; Fierro, A. (2015). N2O emission factors for Italian crops. In: The greenhouse gas balance of Italy: an insight on managed and natural terrestrial ecosystems (editor(s) Valentini, R.; Miglietta, F.). Berlin Heidelberg: Springer: 135-144. ISBN: 9783642324239 doi: 10.1007/978-3-642-32424-6_9. handle: http://hdl.handle.net/10449/25190
N2O emission factors for Italian crops
Miglietta, Franco;
2015-01-01
Abstract
Nitrous oxide (N2O) emissions from several Italian croplands along a latitudinal gradient were analyzed and the fertilizer induced emission (FIE) factor, for each single fertilization event, was calculated. Data show that the average emission factor was between 0.7 and 0.3 %, hence much lower than the IPCC EF used for temperate croplands. The relationship between N2O production and applied N fertilization rate was exponential and not linear, although the rate of exponential increase was lower than previously reported. Maximum N2O emission rate was correlated with magnitude of the total FIE, whereas it was inversely related to the length of FIE, which varied from a minimum of 8–56 days. Overall data suggest that the internationally applied emission factors for temperate crops, which are empirically derived from sites with cooler and wetter climates than the Mediterranean, would overestimate N2O emissions for Italian crops, in particular those developing between spring and summer
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