In this study, we investigated responses of the mid-successional species Acer truncatum Bunge and
the late-successional species Quercus variabilis Blume to three solar illumination conditions: (1) constant
low light (CL), (2) constant high light (CH) and (3) low light first and high light afterwards (LH). The last
treatment was to simulate a canopy opening. Both species exhibited increases in biomass, totally and in
part, and decreases in leaf water content, specific leaf area and chlorophyll concentrations in LH treatment
compared to CL treatment. For A. truncatum, exposure to high light condition (LH) increased crown area,
and decreased root to shoot ratio, stem mass ratio and leaf perimeter. However, for Q. variabilis, LH treatment
increased stem diameter at ground height, effective quantum yield, photochemical quenching and
decreased maximum photosystem II quantum yield. The biomass allocation pattern did not change in Q.
variabilis among three light conditions. With respect to newly developed leaves, no significant differences
were found in leaf size of Q. variabilis between LH treatment and CH treatment while that of A. truncatum
decreased in LH treatment. All chlorophyll fluorescence parameters in newly developed oak leaves in LH
treatment increased compared to those of CH treatment while no difference was found for A. truncatum
between LH and CH treatment. A. truncatum displayed a greater overall plasticity than Q. variabilis although
the oak seedlings have a greater plasticity with respect to chlorophyll concentration and chlorophyll fluorescence
parameters. A. truncatum should be a better candidate for vegetation recovery, especially in places
with heterogeneous light conditions.
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