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APPARENT DAMAGE [1 record]

Record 1 1988-05-27

English

Subject field(s)
  • Effects of Pollution
  • Air Pollution
  • Plant Diseases
CONT

Many studies have shown that temporary impairment of growth at low concentrations can occur without visible injury.

CONT

Chronic damage may occur with sensitive species at mean levels as low as 120 ug.m [Superscript-3] while exposures of a few hours at 100-160 ug.m [Superscript-3] can produce visible injury.

OBS

"Apparent damage", which possess a broader sense then "visible injury", was taken from the Envirotips Manual on Sulphur dioxide, chap. 6.5.1., page 67.

French

Domaine(s)
  • Effets de la pollution
  • Pollution de l'air
  • Maladies des plantes
CONT

En raison de la grande sensibilité de certaines espèces et de la résistance d'autres espèces, il importe de savoir si le fluor gêne l'activité physiologique de la plante quand il ne provoque pas de lésions visibles.

CONT

Aussi bien aux Etats-Unis qu'en Allemagne, on a (...) mis en évidence que les arbres présentant aujourd'hui des dommages visibles avaient depuis trente ans des cernes annuels plus étroits que les arbres qui ne présentent pas de symptômes de dépérissement.

Spanish

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