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Impact of Canopy De...
Impact of Canopy Decoupling and Subcanopy Advection on the Annual Carbon Balance of a Boreal Scots Pine Forest as Derived From Eddy Covariance
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- Jocher, Georg (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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- Marshall, John (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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- Nilsson, Mats (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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- Linder, Sune (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för sydsvensk skogsvetenskap,Southern Swedish Forest Research Centre
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- De Simon, Giuseppe (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Enheten för skoglig fältforskning,Unit for Field-based Forest Research
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- Hörnlund, Thomas (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Enheten för skoglig fältforskning,Unit for Field-based Forest Research
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- Lundmark, Tomas (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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- Näsholm, Torgny (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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- Ottosson Löfvenius, Mikaell (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Enheten för skoglig fältforskning,Department of Forest Ecology and Management,Unit for Field-based Forest Research
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- Tarvainen, Lasse, 1977 (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,University of Gothenburg
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- Wallin, Göran, 1955 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences
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- Peichl, Matthias (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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(creator_code:org_t)
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- 2018
- 2018
- English.
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In: Journal of Geophysical Research: Biogeosciences. - 2169-8953 .- 2169-8961. ; 123:2, s. 303-325
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Abstract
Subject headings
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- Apparent net uptake of carbon dioxide (CO 2 ) during wintertime by an ∼ 90 year old Scots pine stand in northern Sweden led us to conduct canopy decoupling and subcanopy advection investigations over an entire year. Eddy covariance (EC) measurements ran simultaneously above and within the forest canopy for that purpose. We used the correlation of above- and below-canopy standard deviation of vertical wind speed (σ w ) as decoupling indicator. We identified 0.33 m s -1 and 0.06 m s -1 as site-specific σ w thresholds for above- and below-canopy coupling during nighttime (global radiation < 20 W m -2 ) and 0.23 m s -1 and 0.06 m s -1 as daytime (global radiation > 20 W m -2 ) σ w thresholds. Decoupling occurred in 53% of the annual nighttime and 14% of the annual daytime. The annual net ecosystem exchange (NEE), gross ecosystem exchange (GEE), and ecosystem respiration (R eco ) derived via two-level filtered EC data were -357 g C m -2 , -1,138 g C m -2 , and 781 g C m -2 , respectively. In comparison, both single-level friction velocity (u * ) and quality filtering resulted in ~ 22% higher NEE, mainly caused by ~ 16% lower R eco . GEE remained similar among filtering regimes. Accounting for changes of CO 2 storage across the canopy in the single-level filtered data could only marginally decrease these discrepancies. Consequently, advection appears to be responsible for the major part of this divergence. We conclude that the two-level filter is necessary to adequately address decoupling and subcanopy advection at our site, and we recommend this filter for all forested EC sites.
Subject headings
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Skogsvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Forest Science (hsv//eng)
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
- NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Keyword
- Ecosystem respiration (R ) eco
- Flux partitioning
- Gap filling
- Gross primary production (GPP)
- Net ecosystem CO exchange (NEE) 2
- Pinus sylvestris
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Jocher, Georg
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Marshall, John
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Nilsson, Mats
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Linder, Sune
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De Simon, Giusep ...
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Hörnlund, Thomas
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Lundmark, Tomas
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Näsholm, Torgny
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Ottosson Löfveni ...
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Tarvainen, Lasse ...
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Wallin, Göran, 1 ...
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Peichl, Matthias
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- About the subject
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- AGRICULTURAL SCIENCES
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AGRICULTURAL SCI ...
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and Agriculture Fore ...
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and Forest Science
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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and Ecology
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- AGRICULTURAL SCIENCES
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AGRICULTURAL SCI ...
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and Agriculture Fore ...
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and Soil Science
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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and Botany
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geophysics
- Articles in the publication
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Journal of Geoph ...
- By the university
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University of Gothenburg
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Swedish University of Agricultural Sciences