Division III.6 Identification of visible ozone on (small) tree, shrub, and perennial species within the LESS and (optional) the ground vegetation within the Level II plot

For the symptom assessment of small tree, shrub, and herbs species within the LESS and the ground vegetation (optional) within the Level II plot the following information is required for each of the randomly selected sampling spatial unit:

• The scientific name and code of the present (small) tree, shrub, and herbs species with the indication whether they show symptoms or not.

• Trees and shrubs shall be assessed singularly, vines and herbs as populations;

• Estimates are therefore resulting in terms of frequency, means and totals:

  • frequency of quadrates including symptomatic plants (% of forest edge vegetation area affected),

  • frequency of symptomatic species (% of symptomatic species over the total number of species of the forest edge),

  • mean number of symptomatic species,

  • total number of symptomatic species,

  • estimates should be reported with confidence intervals at a 95 % probability level.

Soil moisture conditions shall be recorded within the LESS and the optional subplots. Samples and pictures of each injured are to taken of species in accordance with the technical recommendations of the Working Group on Ambient Air Quality.