The effects of sodium erythorbate and ethylenediurea on photosynthetic function of ozone-exposed loblolly pine seedlings

air pollution antioxidantes antioxidants antioxydant arbre forestier azote carotenoide carotenoides carotenoids chemical composition chlorophylle chlorophylls chloroplaste chloroplasts clorofilas cloroplasto composition chimique fitotoxicidad forest trees gas exchange intercambio de gases nitrogen ozone ozono photosynthese photosynthesis phytotoxicity pigment pigmentos pigments pinus taeda plantule regression analysis seedlings statistical methods