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Photosynthesis - Solar Induced Fluorescence relationships in polar ecosystems
Kadmiel MaseykThe Open University, UK
@kmaseykHolly Croft, University of Sheffield, UK
Cheryl Rogers, University of Toronto, CanadaTerenzio Zenone, University of Exeter, UK
Walter Oechel, San Diego State University, USADonatella Zona, San Diego State University, USA
Summary• Short campaigns of ground-based SIF measurements were
made in a range of high latitude ecosystems (Antarctic and Arctic)
• Measurements were coupled with photosynthesis measured at different scales (surface chamber, LI6400 leaf, eddy covariance)
• SIF shows linear responses to PAR – variable between ecosystems but also some commonality
• SIF captures short-term temporal dynamics of photosynthesis across scales, but needs to incorporate species and environmental data for quantification
• Ryder Bay, Antarctic Peninsular• Abisko, north Sweden• Utqiaġvik (Barrow), Alaska
Measurement sites
VegetationAntarctica: moss beds, and moss with Deschampsia antarctica
Abisko: Stordalen Bog –cloudberry (Rubus) cranberry (Vaccinium)
Research Station –Salix shrub
Utqiaġvik: wet coastal tundra
SIF measurementsDual-field-of-view spectrometry – Piccolo Doppio(Mac Arthur et al. 2014)
Antarctic moss beds
Arctic wet coastal tundra
Arctic bog
Arctic shrub
Photosynthesis measurements
Antarctic moss bedssurface chamber
Arctic wet coastal tundraEddy covariance
Arctic shrub and bog LI6400 leaf phs
Relationships with PARAntarctic moss beds: Increasing SIF with increasing activity and biomass, even dry moss produces some SIF but overall low SIF values
Deschampsia - moss turfsnow melt mossdry moss
SIF
(mW
m-2
nm
-1 s
r-1)
0
0.1
0.2
0.3
0.4
PAR (μmol m-2 s-1)0 200 400 600 800 1000 1200 1400
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0
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SIF
(mW
m-2
nm-1
sr-
1 )
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0 250 500 750 1000PAR (µmol m-2 s-1)
SIF
(mW
m-2
nm-1
sr-1 )
Arctic bog and shrub: Salix (Res Stn) and Vaccinium(Stord.1) on a similar relationship, Rubus (Stord.2) more noisy and higher SIF values
Arctic coastal tundra: Stable relationship over time, similar relationship to Salix + Vaccinium
Unpubl.
Relationships with PhotosynthesisAntarctic moss beds: SIF quite variable for given photosynthesis in the mixed community
Arctic bog and shrub: Similar divergence between Salix and Rubus, due to different phs - light responses
Arctic coastal tundra: Lot of variability in the GPP-SIF relationship, indicating role of other factors, but scale similar to Salix for LAI = 1
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0 2 4 6 8Net Photosynthesis (µmol m-2 s-1)
SIF
(mW
m-2 n
m-1 s
r-1 )
Deschampsia - moss turfsnow melt mossdry moss
SIF
(mW
m-2
nm
-1 s
r-1)
0
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Net CO2 flux (μmol m-2 s-1)−3 −2 −1 0 1 2 3 4 5 6
Surface photosynthesis (µmol m -2 s-1)
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0.0
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0.0 2.5 5.0 7.5 10.0GPP (µmol m-2 s-1)
SIF
(mW
m-2
nm-1
sr-1
)
Unpubl.
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10.0
12.5
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1.25
Jun 24 06:00 Jun 24 12:00 Jun 24 18:00 Jun 25 00:00Date
Net P
hoto
synt
hesis
(µm
ol m
-2 s-
1 )
SIF (mW
m-2 nm
-1 sr -1)
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12:00 15:00 18:00Time (Jun 20)
Net
Pho
tosy
nthe
sis
(µm
ol m
-2 s-1
)
SIF (mW
m-2 nm
-1 sr -1)
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GPPSIF
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Jul 31 Aug 02 Aug 04 Aug 06 Aug 08 Aug 10Date
GPP
(µm
ol m
-2 s-1
)
SIF (mW
m-2 nm
-1 sr -1)Capturing temporal dynamics
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Res Stn.
Stord.
0.0
2.5
5.0
7.5
0 500 1000 1500 2000PAR (µmol m-2 s-1)
Net
Pho
tosy
nthe
sis
(µm
ol m
-2 s-1
)
Unpubl.
