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Dernière mise à jour : Mai 2018

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UMR ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes

Poster 2 : Fababean_N2O_IPNOA

Poster 2
Iride Volpi, Simona Bosco, Federico Triana, Patricia Laville, Nicoletta Nassi o Di Nasso, Enrico Bonari

Soil gas flux calculation from chamber measurements: the influence of faba bean (Vicia faba L. var. minor) volume on headspace volume

The chamber technique is widely used to measure soil gas fluxes. This technique allows to test the effects of different crop managements on soil gas emissions in agricultural soils. Collar and chamber volumes are both part of the headspace volume and must be included in the gas flux calculation. The aim of this work is to understand whether plant volume needs to be measured or not in order to accurately calculate soil gas fluxes. Nitrous oxide (N2O) was monitored on a faba bean (Vicia faba L. var. minor) cultivation that was part of the LIFE+IPNOA project field trials in Pisa (central Italy). The treatment was tillage intensity with two levels, ploughing (30 cm deep) and minimum tillage (10 cm deep). Plants volume was measured monthly with water displacement method using a graduated cylinder. At the end of the flux monitoring campaign two N2O fluxes datasets were compared, one including plants volume in headspace volume calculation and the other not including it. Statistical analysis highlighted no differences between the two datasets. Although plants height was about 1.3 meters at the harvest, crop volume during the crop cycle was only in the range from 0.7 to 3.4 % of the headspace volume. On the other hand, tillage intensity was identified as a key factor affecting N2O emissions. The increasing depth of the tillage was the major driver for the N2O emissions.

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