Abstract
SUMMARY The response of chlorophyll and carotenoid concentration, specific leaf area and dry weight fraction in shoots of Sitka spruce ( Picea sitchensis (Bong.) Carr.) to season and photon flux density has been measured. Shoots were sampled from different heights in the canopy at two forest sites, one thinned, the other unthinned. An increase in specific leaf area and a decrease in dry weight fraction was found in shaded shoots. At both sites, there was a seasonal variation in pigment content, with a summer maximum for chlorophyll and a winter maximum for carotenoid. Pigment content was constant throughout the canopy on the thinned site, but was higher in shaded shoots from the unthinned site.
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Claims 6
Claim · model-written summary
Shaded spruce shoots had increased specific leaf area.
- Taxon
- Sitka spruce
.jpg?width=60)
Picea sitchensist0 - Outcome
- specific leaf areae0
- Direction
- increasee0
- Setting
- shaded shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“An increase in specific leaf area and a decrease in dry weight fraction was found in shaded shoots.”
t0“Sitka spruce”
Claim · model-written summary
Shaded spruce shoots had decreased dry weight fraction.
- Taxon
- Sitka sprucePicea sitchensist0
- Outcome
- dry weight fractione0
- Direction
- decreasee0
- Setting
- shaded shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in specific leaf area and a decrease in dry weight fraction was found in shaded shoots.”
t0“Sitka spruce”
Claim · model-written summary
Chlorophyll peaked in summer at both sites.
- Taxon
- Sitka sprucePicea sitchensist0
- Outcome
- maximum for chlorophylle0
- Direction
- maximume0
- Qualifier
- summere0
- Setting
- both sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At both sites, there was a seasonal variation in pigment content, with a summer maximum for chlorophyll and a winter maximum for carotenoid.”
t0“Sitka spruce”
Claim · model-written summary
Carotenoid peaked in winter at both sites.
- Taxon
- Sitka sprucePicea sitchensist0
- Outcome
- maximum for carotenoide0
- Direction
- maximume0
- Qualifier
- wintere0
- Setting
- both sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At both sites, there was a seasonal variation in pigment content, with a summer maximum for chlorophyll and a winter maximum for carotenoid.”
t0“Sitka spruce”
Claim · model-written summary
Pigment content was constant through the thinned canopy.
- Taxon
- Sitka sprucePicea sitchensist0
- Outcome
- Pigment contente0
- Direction
- constante0
- Setting
- thinned sitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pigment content was constant throughout the canopy on the thinned site”
t0“Sitka spruce”
Claim · model-written summary
Pigment content was higher in shaded shoots at the unthinned site.
- Taxon
- Sitka sprucePicea sitchensist0
- Organ / stage
- shaded shootse0
- Outcome
- Pigment contente1
- Direction
- highere0
- Setting
- unthinned sitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was higher in shaded shoots from the unthinned site.”
e1“Pigment content was constant throughout the canopy on the thinned site”
t0“Sitka spruce”