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We assessed variable chlorophyll fl uorescence (Fv/Fm) and needle chlorophyll concentration of seedlings of Maccedonia fi r (Abies borisii regis Mattfeld), subalpine fi r (A. lasiocarpa (Hooker) Nuttall) , Sakhalin fi r (A. sachalinensis (Schmidt) Mast.), Siberian fi r (A. sibirica (Lebed.)), and Veitch fi r (A. veitchii Lindl.) grown under varying soil me- dia pH. Soil media pH was modifi ed using liquid fl owable dolomitic limestone, resulting in fi ve pH levels (3.4, 4.0, 5.4, 6.0, and 6.8). Increasing media pH signifi cantly reduced Fv/Fm and needle chlorophyll concentration in all of the species tested. The effect of pH on photochemistry was due to depressed nutrient uptake of P, Mn, B, and Cu. Because photosynthetic quantum yield may be related to defi ciencies of several elements affected by pH, Fv/Fm may serve as a criterion to select for improved pH tolerance. Among the species examined, A. veitchii and A. lasiocarpa were most tolerant of increased pH based on Fv/Fm and needle chlorophyll concentration.

Chlorophyll Fluorescence and Needle Chlorophyll Concentration of Fir (Abies sp.) Seedlings in Response to pH