Abstract: To investigate the relation of water supply condition in rhizosphere and leaf photosynthetic
characteristics，the paper studied the effects of different treatments such as Natural light with normal water
supply（T1），Shading 50% with normal water supply（T2），Natural light with drought（T3）and Shading
50% with drought（T4）on leaf photosynthetic parameters and chlorophyll fluorescence parameters of
potted ginger. The results showed that during the treatment，the Pn in T1，T2 had no significant change，
but in T3，T4 reduced constantly and amplitude of T3 was significantly higher than T4；With the
prolonging of treatment，Ci and Ls in T1，T2 all had no significant change，but Ci in T3 and T4 increased
and Ls reduced after 1 and 3 days of stress treatment respectively，showing that the initial reduced of Pn in T3，T4 is mainly due to stomatal limitation and the latter to non-stomatal limitation；After six-day stress，
although Pn reduced significantly in all treatments at midday，but the amplitude of T3，T4 was higher than
T1 and T2，especially T3 did not appear second peak，while T1，T2，T4 all showed a bimodal curve. The
Fv/Fm of ginger leaves in T1，T3，T4 reduced constantly during stress treatment，meanwhile NPQ increased，
and the largest change amplitude was got by T3，and followed by T4 and T1，but T2 had no significant
change. After six-day treatment，Fv/Fm，ФPSⅡ，qP in all treatments reduced significantly at noon，meanwhile
NPQ increased prominently，the largest change amplitude was got by T3，and followed by T4 and T1，but
the change amplitude of T2 was smaller. The results indicated that the effect of water stress was greater
than strong light on ginger leaves photochemical efficiency，and shading can relieve drought stress.

Key words: ginger, light, photochemical efficiency, photosynthesis