Time-resolving luminescence techniques for possible detection of forest decline |
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Authors: | W Schmidt H Schneckenburger |
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Institution: | (1) Fachbereich Optoelektronik, Fachhochschule Aalen, Beethovenstrasse 1, W-7080 Aalen, Germany;(2) Fakultät für Biologie, Universität Konstanz, Postfach 5560, W-7750 Konstanz 1, Germany |
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Abstract: | 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.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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Keywords: | |
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