Summary
Needles from spruces at different environmental and physiological conditions were analyzed by long term delayed luminescence in the seconds-range (LDL) using a novel set-up with on-line computer and a specially written computer program. Upon red light induction, the LDL-kinetics showed a super-position of three exponentially decaying components (“fast”, “medium” and “slow”) with reaction constants ofk f =5−15 s−1,k m =0.8−1.8 s−1 andk s =0.13−0.23 s−1,k s -values are fairly independent of the individual tree and quite stable throughout the whole year. They are also independent of the status and localization, i.e. the physiological situation of the individual tree. However,k m -andk f -values as well as the related amplitudesA m andA f exhibit a general, significant seasonal variation and obviously are correlated with the damage class or the environmental situation of the individual tree. Therefore, the measurement of long term delayed luminescence might offer a valuable piece of information in search of an early detection of forest decline.
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Abbreviations
- SDL:
-
short term delayed luminescence (lasting from ms to µs), LDL long term delayed luminescence (lasting from s to min)
- OTC:
-
Open Top Chamber
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Schmidt, W., Schneckenburger, H. Time-resolving luminescence techniques for possible detection of forest decline. Radiat Environ Biophys 31, 63–72 (1992). https://doi.org/10.1007/BF01211513
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DOI: https://doi.org/10.1007/BF01211513