Assessing ozone and nitrogen impact on net primary productivity with a Generalised non-Linear Model.
Some studies suggest that in Europe the majority of forest growth increment can be accounted for N deposition and very little by elevated CO(2). High ozone (O(3)) concentrations cause reductions in carbon fixation in native plants by offsetting the effects of elevated CO(2) or N deposition. The cause-effect relationships between primary productivity (NPP) of Quercus cerris, Q. ilex and Fagus sylvatica plant species and climate and pollutants (O(3) and N deposition) in Italy have been investigated by application of Generalised Linear/non-Linear regression model (GLZ model). The GLZ model highlighted: i) cumulative O(3) concentration-based indicator (AOT40F) did not significantly affect NPP; ii) a differential action of oxidised and reduced nitrogen depositions to NPP was linked to the geographical location; iii) the species-specific variation of NPP caused by combination of pollutants and climatic variables could be a potentially important drive-factor for the plant species' shift as response to the future climate change.
Italian National Agency for New Technologies, Energy and the Environment (ENEA), C.R. Casaccia, Via Anguillarese 301, 00123 S. Maria di Galeria, Rome, Italy. alessandra.demarco@casaccia.enea.it
Alessandra
A
De Marco
Augusto
A
Screpanti
Fabio
F
Attorre
Chiara
C
Proietti
Marcello
M
Vitale
D000393:Air Pollutants / Q000032:analysis* / Q000633:toxicity; D000397:Air Pollution / Q000706:statistics & numerical data; D057231:Climate Change; D004784:Environmental Monitoring; D007558:Italy; D009584:Nitrogen / Q000032:analysis* / Q000633:toxicity; D017711:Nonlinear Dynamics; D010126:Ozone / Q000032:analysis* / Q000633:toxicity; D014197:Trees / Q000187:drug effects / Q000254:growth & development / Q000502:physiology*
D000393:Air Pollutants; D010126:Ozone; D009584:Nitrogen