Effects of elevated CO2, elevated O3 and potassium deficiency on Norway spruce (Picea abies (L.) Karst.): seasonal changes in photosynthesis and non-structural carbohydrate content.

age air pollution amidon arbre forestier carbohidratos carbohydrates carbon dioxide carence en substance nutritive chemical composition composition chimique deficiencias nutritivas dioxyde de carbone edad efecto invernadero effet de serre feuille forest trees fructosa fructose glucide glucosa glucose greenhouse effect hojas leaves nutrient deficiencies nutrition des plantes ozone ozono photosynthese photosynthesis picea abies plant nutrition potasio potassium seasonal variation starch