photosynthesis -solar induced fluorescence relationships ... · photosynthesis in the mixed...
TRANSCRIPT
![Page 1: Photosynthesis -Solar Induced Fluorescence relationships ... · photosynthesis in the mixed community Arctic bog and shrub: Similar divergence between Salixand Rubus,duetodifferent](https://reader035.vdocuments.site/reader035/viewer/2022070107/60215cab6f804563e5564f18/html5/thumbnails/1.jpg)
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
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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
![Page 3: Photosynthesis -Solar Induced Fluorescence relationships ... · photosynthesis in the mixed community Arctic bog and shrub: Similar divergence between Salixand Rubus,duetodifferent](https://reader035.vdocuments.site/reader035/viewer/2022070107/60215cab6f804563e5564f18/html5/thumbnails/3.jpg)
• Ryder Bay, Antarctic Peninsular• Abisko, north Sweden• Utqiaġvik (Barrow), Alaska
Measurement sites
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VegetationAntarctica: moss beds, and moss with Deschampsia antarctica
Abisko: Stordalen Bog –cloudberry (Rubus) cranberry (Vaccinium)
Research Station –Salix shrub
Utqiaġvik: wet coastal tundra
![Page 5: Photosynthesis -Solar Induced Fluorescence relationships ... · photosynthesis in the mixed community Arctic bog and shrub: Similar divergence between Salixand Rubus,duetodifferent](https://reader035.vdocuments.site/reader035/viewer/2022070107/60215cab6f804563e5564f18/html5/thumbnails/5.jpg)
SIF measurementsDual-field-of-view spectrometry – Piccolo Doppio(Mac Arthur et al. 2014)
Antarctic moss beds
Arctic wet coastal tundra
Arctic bog
Arctic shrub
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Photosynthesis measurements
Antarctic moss bedssurface chamber
Arctic wet coastal tundraEddy covariance
Arctic shrub and bog LI6400 leaf phs
![Page 7: Photosynthesis -Solar Induced Fluorescence relationships ... · photosynthesis in the mixed community Arctic bog and shrub: Similar divergence between Salixand Rubus,duetodifferent](https://reader035.vdocuments.site/reader035/viewer/2022070107/60215cab6f804563e5564f18/html5/thumbnails/7.jpg)
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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0 500 1000 1500PAR (µmol m-2 s-1)
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.
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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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Res Stn.Stord.
0.0
0.5
1.0
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2.0
2.5
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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0.45
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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1.0
1.5
2.0
0.0 2.5 5.0 7.5 10.0GPP (µmol m-2 s-1)
SIF
(mW
m-2
nm-1
sr-1
)
Unpubl.
![Page 9: Photosynthesis -Solar Induced Fluorescence relationships ... · photosynthesis in the mixed community Arctic bog and shrub: Similar divergence between Salixand Rubus,duetodifferent](https://reader035.vdocuments.site/reader035/viewer/2022070107/60215cab6f804563e5564f18/html5/thumbnails/9.jpg)
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PhsSIF
0.0
2.5
5.0
7.5
10.0
12.5
0.00
0.25
0.50
0.75
1.00
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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6
0
2
4
6
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
0
5
10
15
0
1
2
3
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.