Improved sapflow methodology reveals considerable night-time ozone uptake by Mediterranean species

Giacomo Alessandro Gerosa, Angelo Finco, Simone Mereu, Lina Fusaro, S. Mereu, L. Fusaro, B. Muys, F. Manes

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

7 Citazioni (Scopus)

Abstract

Due to the evident tropospheric ozone impact on plant productivity, an accurate ozone risk assessment for the vegetation has become an issue. There is a growing evidence that ozone stomatal uptake may also take place at night and that the night-time uptake may be more damaging than diurnal uptake. Estimation of night-time uptake in the field is complicated because of instrumental difficulties. Eddy covariance technology is not always reliable because of the low turbulence at night. Leaf level porometry is defective at relative humidity above 70% which often takes place at night. Improved sap flow technology allows to estimate also slow flows that usually take place at night and hence may be, at present, the most trustworthy technology to measure night-time transpiration and hence to derive canopy stomatal conductance and ozone uptake at night. Based on micrometeorological data and the sap flow of three Mediterranean woody species, the night-time ozone uptake of these species was evaluated during a summer season as drought increased. Night-time ozone uptake was from 10% to 18% of the total daily uptake when plants were exposed to a weak drought, but increased up to 24% as the drought became more pronounced. The percentage increase is due to a stronger reduction of diurnal stomatal conductance than night-time stomatal conductance.
Lingua originaleEnglish
pagine (da-a)3151-3162
Numero di pagine12
RivistaBiogeosciences
Volume6
Stato di pubblicazionePubblicato - 2009

Keywords

  • fluxes
  • mediterranean maquis
  • night
  • ozone
  • sap-flow
  • water

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