Validation and parametrization of the soil moisture index for stomatal conductance modelling and flux-based ozone risk assessment of Mediterranean plant species
Journal article, 2024

The Mediterranean region chronically experiences high levels of tropospheric ozone (O3) that can affect the health of vegetation. However, limiting plant growing conditions, such as low soil moisture, may restrict the stomatal phytotoxic ozone dose (POD) absorbed by vegetation, modulating O3 detrimental effects. Atmospheric chemistry transport models that estimate POD for O3 risk assessment of effects on vegetation species, such as the European Monitoring and Evaluation Programme (EMEP), have adopted the soil moisture index (SMI) to consider the influence of soil moisture on POD. The objectives of this study were the parametrization and validation of the SMI effect on stomatal conductance (gs) for improving the POD estimation and O3 risk assessment for different vegetation species under water-limiting growing conditions, using field data collected in Italy and Spain and a literature review. The modelled SMI from EMEP proved to be a good indicator of soil moisture dynamics across sites and years, although it showed a general tendency to overestimate soil moisture availability for plants, particularly in the driest seasons. New parametrizations derived for modelling SMI effects on gs under Mediterranean conditions proposed in this study stress the importance of using species-specific parameters for species showing contrasting water-saving strategies in contrast of the current approach of using a simple relation between SMI and gs for all the species. Furthermore, gs modelling parametrizations based on soil water potential (SWP) were found to be more suitable than SMI for local scale estimation of POD under water-limiting conditions. Further consideration of rooting depth and distribution will be required in the future to determine the soil depth at which the soil moisture should be measured in POD modelling, since these features represent one of the most important uncertainties affecting the estimation of POD that could not be addressed with the present database.

Quercus ilex

Leaf water potential

Broadleaf deciduous Mediterranean oaks

Mediterranean annual pastures

Phytotoxic ozone dose (POD)

Drought

Author

Tania Carrasco-Molina

Rey Juan Carlos University (URJC)

Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (Ciemat)

Riccardo Marzuoli

Università Cattolica del Sacro Cuore

Vicent Calatayud

Fundacion Centro de Estudios Ambientales del Mediterraneo

David Simpson

Chalmers, Space, Earth and Environment, Geoscience and Remote Sensing

Norwegian Meteorological Institute

G. Gerosa

Università Cattolica del Sacro Cuore

Arnaud Carrara

Fundacion Centro de Estudios Ambientales del Mediterraneo

Isaura Rábago

Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (Ciemat)

R. Alonso

Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (Ciemat)

Ignacio González-Fernández

Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (Ciemat)

Agricultural and Forest Meteorology

0168-1923 (ISSN)

Vol. 354 110080

Subject Categories

Meteorology and Atmospheric Sciences

Ecology

DOI

10.1016/j.agrformet.2024.110080

More information

Latest update

6/14/2024