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Chlorophyll a, Chl a (A), chlorophyll b, Chl b (B), carotenoid, Cx+c (C), and leaf nitrogen (D) concentrations in randomly selected, fully expanded penultimate leaves of Spartina densiflora in response to treatment with a range of salinity concentrations at ambient and elevated CO2 concentration over 90 d. Values represent mean ±SE, n=5. Different letters indicate means that are significantly different from each other (two-way ANOVA, CO2×salinity; Tukey test, P <0.05).
