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Plant Biol (Stuttg) 2002; 4(2): 228-233
DOI: 10.1055/s-2002-25731
Original Paper
Georg Thieme Verlag Stuttgart ·New York

A Novel System for Spectral Analysis of Solar Radiation within a Mixed Beech-Spruce Stand

H. Reitmayer, H. Werner, P. Fabian
  • Department of Ecology / Bioclimatology and Pollution Research, Technische Universität München, Freising, Germany
Further Information

Publication History

May 28, 2001

November 21, 2001

Publication Date:
26 April 2002 (online)

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Abstract

A multi-sensor system is described, based on a 1024 channel diode array spectrometer, to measure spectral radiant flux density in the range of 380 nm to 850 nm, with a resolution of 0.8 nm in minimal 16 milliseconds integration time per sensor (noon, clear sky conditions). 264 space-integrating 4π sensors deployed in the canopies and 2 m above stand floor are sequentially connected to the spectrometer by means of 30-m long fibre optics. During low-level conditions (dawn, overcast sky) the system automatically lengthens the integration time of the spectrometer. About 3 sec per sensor, i.e., 13 min for the total of 264 sensors (worst case) are needed to collect spectral energy data, store them on hard disk and move the channel multiplexer to the next fibre optic position. The detection limit of quartz fibre sensors is 0.2 W/m2; precision and absolute error of radiant flux density are smaller than 3 % and 10 %, respectively.

The system, operating since 1999, is derived from a 20-sensor pilot system developed for PAR measurements (PMMA fibre sensor, 400nm to 700 nm).

Data achieved with the system serve to determine vertical profiles of wavelength dependent radiation extinction, with special respect to R/FR ratios and to develop a model of spectral radiation distribution in a mature forest stand, prerequisites for the computation of carbon gain of the stand and the evaluation of stand growth models.

Key words

Solar radiation - PAR - red/far-red ratio - fibre optic sensor - spectral analysis - forest - beech - spruce

References

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H. Reitmayer

Department of Ecology/Bioclimatology and Pollution Research
Technische Universität München

Am Hochanger 13
85354 Freising
Germany

Section Editor: U. Lüttge