Figure 4
Overnight dark-adapted maximum photochemical efficiency of photosystem II (Fv/Fm) as a function of integrated PPFD during the morning (PPFDint) in 1-year-old shoots of field-grown Abies sachalinensis measured immediately before budbreak in springtime (a) and summertime (b), with various rates of canopy tree cutting conducted in October 2015 (open symbols) and January 2016 (closed symbols). The PPFDint was estimated for May 10, 2016 (a) and July 25, 2016 (b) based on a hemispheric photograph for each plot. Values are means ± standard error (SE) of n = 3–5.
