CHLOROPHYLL FLUORESCENCE AND DELAYED FLUORESCENCE AS POTENTIAL TOOLS IN REMOTE-SENSING - A REFLECTION OF SOME ASPECTS OF PROBLEMS IN COMPARATIVE-ANALYSIS

Induction kinetics of chlorophyll fluorescence (the Kautsky effect) an d delayed fluorescence (DF) of some cold climate species were studied in both laboratory and in situ experiments to assess their vlaue as in dicators of plant health. Experiments included studies of natural vari ability of fluorescence in connection with the seasonal leaf maturatio n process, as well as the influence of environmental stress factors, s uch as ozone. It was found that parameters of induction curves (normal ized variable fluorescence, time of its half decrease) could be used a s indicators of plant health. No significant differences have been eli cited between the information content of the Kautsky effect and induct ion curves of DF as tools for remote sensing. It is suggested that mea surements of the single decay curves of DF are preferable for remote e stimation of photosynthetic capacity.