Photosynthetic Active Pigments Changes in Norway Spruce (Picea abies) under the Different Acclimation Irradiation and Elevated CO₂ Content

Figure 2

Chl b content in Norway spruce needles associated with dry matter (mg·g⁻¹). Legend on the right side represents acclimation irradiance 100 μmol·m⁻²·s⁻¹ and 1200 μmol·m⁻²·s⁻¹. AC—ambient concentration of CO₂—350 μmol·mol⁻¹, days 1−11 (elevated concentration of CO₂: 700 μmol·mol⁻¹).