Seasonal variation in the red/far-red ratio and photon flux density in an Australian sub-tropical rainforest

Turnbull M.H. and Yates D.J. (1993) Seasonal variation in the red/far-red ratio and photon flux density in an Australian sub-tropical rainforest. Agricultural and Forest Meteorology, 64 1-2: 111-127. doi:10.1016/0168-1923(93)90096-Z


Author Turnbull M.H.
Yates D.J.
Title Seasonal variation in the red/far-red ratio and photon flux density in an Australian sub-tropical rainforest
Journal name Agricultural and Forest Meteorology   Check publisher's open access policy
ISSN 0168-1923
Publication date 1993-01-01
Sub-type Article (original research)
DOI 10.1016/0168-1923(93)90096-Z
Open Access Status
Volume 64
Issue 1-2
Start page 111
End page 127
Total pages 17
Subject 1107 Immunology
1902 Film, Television and Digital Media
1900 Earth and Planetary Sciences
2300 Environmental Science
Abstract The temporal distribution of red light (R, in the range 655-665 nm) and far-red light (FR, in the range 725-735 nm) was measured at 10 min intervals for 1 year at three contrasting sites in a sub-tropical rainforest. It was measured in the understorey beneath a closed canopy, in the middle of a 450 m2 tree-fall gap, and at the transition between the gap and understorey. The red/far-red ratio (R/FR) was calculated from these data. Values of photon flux density (PFD, in the range 400-700 nm) were also determined from the output of the R sensing channel of each sensor. Although a higher overall R/FR ratio was measured in the gap site compared with the understorey and gap-edge sites, R/FR ratios in the gap were at levels which are indicative of canopy shade (between 0.4 and 0.8) for much of the day. No distinct seasonal variation in daily average R/FR ratio was observed in any of the three sites, although day to day variation was marked. Daily average R/FR ratio was generally higher in the gap-edge and gap sites than in the understorey. Daily average PFD in the understorey was below 20 μmol m-2 s-1 for all but 1 day during the year, and below 30 μmol m-2 s-1 for 7 months at the gap-edge site and 3 months in the gap. While daily average PFD also varied from day to day in the gap-edge and gap sites, observations showed considerable seasonal variation during the course of the year.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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