TY - JOUR
T1 - Comparison of seasonal variations of ozone exposure and fluxes in a Mediterranean Holm oak forest between the exceptionally dry 2003 and the following year
AU - Gerosa, Giacomo Alessandro
AU - Finco, Angelo
AU - Mereu, Simone
AU - Vitale, Marcello
AU - Manes, Fausto
AU - Ballarin Denti, Antonio Angelo
PY - 2009
Y1 - 2009
N2 - Ozone and energy fluxes have been measured using the eddy covariance technique, from June to December 2004 in Castelporziano near Rome (Italy), and compared to similar measurements made in the previous year. The studied ecosystem consisted in a typical Mediterranean Holm oak forest. Stomatal fluxes have been calculated using the resistance analogy and by inverting the Penmann-Monteith equation. Results showed that the average stomatal contribution accounts for 42,6% of the total fluxes. Non-stomatal deposition proved to be enhanced by increasing leaf wetness and air humidity during the autumnal months.
From a comparison of the two years, it can be inferred that water supply is the most important limiting factor for ozone uptake and that prolonged droughts alter significantly the stomatal conductance, even two months after the soil water content is replenished. Ozone exposure, expressed as AOT40, behaves similarly to the cumulated stomatal flux in dry conditions whereas a different behaviour for the two indexes appears in wet autumnal conditions. A difference also occurs between the two years.
AB - Ozone and energy fluxes have been measured using the eddy covariance technique, from June to December 2004 in Castelporziano near Rome (Italy), and compared to similar measurements made in the previous year. The studied ecosystem consisted in a typical Mediterranean Holm oak forest. Stomatal fluxes have been calculated using the resistance analogy and by inverting the Penmann-Monteith equation. Results showed that the average stomatal contribution accounts for 42,6% of the total fluxes. Non-stomatal deposition proved to be enhanced by increasing leaf wetness and air humidity during the autumnal months.
From a comparison of the two years, it can be inferred that water supply is the most important limiting factor for ozone uptake and that prolonged droughts alter significantly the stomatal conductance, even two months after the soil water content is replenished. Ozone exposure, expressed as AOT40, behaves similarly to the cumulated stomatal flux in dry conditions whereas a different behaviour for the two indexes appears in wet autumnal conditions. A difference also occurs between the two years.
KW - FLUSSI DI OZONO
KW - FORESTA MEDITERRANEA
KW - LECCIO
KW - VARIAZIONI STAGIONALI
KW - FLUSSI DI OZONO
KW - FORESTA MEDITERRANEA
KW - LECCIO
KW - VARIAZIONI STAGIONALI
UR - http://hdl.handle.net/10807/29764
U2 - 10.1016/j.envpol.2007.11.025
DO - 10.1016/j.envpol.2007.11.025
M3 - Article
SN - 0269-7491
VL - 157
SP - 1737
EP - 1744
JO - Environmental Pollution
JF - Environmental Pollution
ER -