Effects of Simulated Tropospheric Ozone on nutrients levels and photosynthetic pigments concentrations of three Mangrove species

摘要

Three months old seedlings of three mangrove species (Rhizophora mangle, Laguncularia racemosa, and Conocarpus erectus) were fumigated during 6 weeks at three different concentrations of ozone (50, 110 and 250 ppb) using charcoal filtered air within an open-top chamber from June to July in 2009. Visible damages were identified, effects on phtosynthetic pigment levels (chlorophyll a, chlorophyll b, total chlorophyll and total charotenoids), soluble proteins content and nutrients concentrations (Ca~(2+), Mn~(2+), Mg~(2+) and K~+) were determined. All mangrove species studied showed sensitiveness to ozone exposure levels, being Red mangrove the most sensitive specie to tropospheric ozone.