Advanced

The carbon balance of a managed boreal landscape measured from a tall tower in northern Sweden

Chi, Jinshu; Nilsson, Mats B.; Kljun, Natascha LU ; Wallerman, Jörgen; Fransson, Johan; Laudon, Hjalmar; Lundmark, Tomas and Peichl, Matthias (2019) In Agricultural and Forest Meteorology 274. p.29-41
Abstract
Boreal forests exchange large amounts of carbon dioxide (CO2) with the atmosphere. A managed boreal landscape usually comprises various potential CO2 sinks and sources across forest stands of varying age classes, clear-cut areas, mires, and lakes. Due to this heterogeneity and complexity, large uncertainties exist regarding the net CO2 balance at the landscape scale. In this study, we present the first estimate of the net CO2 exchange over a managed boreal landscape (∼68 km2) in northern Sweden, based on tall tower eddy covariance measurements. Our results suggest that from March 1, 2016 to February 28, 2018, the heterogeneous landscape was a net CO2 sink with a 2-year mean uptake of −87 ± 6 g C m−2 yr−1. Due to an earlier and warmer... (More)
Boreal forests exchange large amounts of carbon dioxide (CO2) with the atmosphere. A managed boreal landscape usually comprises various potential CO2 sinks and sources across forest stands of varying age classes, clear-cut areas, mires, and lakes. Due to this heterogeneity and complexity, large uncertainties exist regarding the net CO2 balance at the landscape scale. In this study, we present the first estimate of the net CO2 exchange over a managed boreal landscape (∼68 km2) in northern Sweden, based on tall tower eddy covariance measurements. Our results suggest that from March 1, 2016 to February 28, 2018, the heterogeneous landscape was a net CO2 sink with a 2-year mean uptake of −87 ± 6 g C m−2 yr−1. Due to an earlier and warmer spring and sunnier autumn, the landscape was a stronger CO2 sink during the first year (−122 ± 8 g C m−2) compared to the second year (−52 ± 9 g C m−2). Footprint analysis shows that 87% of the CO2 flux measurements originated from forests, whereas mires, clear-cuts, lakes, and grassland contributed 11%, 1%, 0.7%, and 0.2%, respectively. Altogether, the CO2 sink strength of the heterogeneous landscape was up to 38% lower compared to the sink strength of a mature stand surrounding the tower. Overall, this study suggests that the managed boreal landscape acted as a CO2 sink and advocates tall tower eddy covariance measurements to improve regional carbon budget estimates. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Boreal landscape, Tall tower eddy covariance, Footprint analysis, Land cover heterogeneity, CO2 Flux
in
Agricultural and Forest Meteorology
volume
274
pages
29 - 41
publisher
Elsevier
external identifiers
  • scopus:85067982099
ISSN
0168-1923
DOI
10.1016/j.agrformet.2019.04.010
language
English
LU publication?
yes
id
10cb77c0-683b-4cb3-aae8-bacacda29f7c
date added to LUP
2019-05-06 10:51:34
date last changed
2019-07-30 04:59:50
@article{10cb77c0-683b-4cb3-aae8-bacacda29f7c,
  abstract     = {Boreal forests exchange large amounts of carbon dioxide (CO2) with the atmosphere. A managed boreal landscape usually comprises various potential CO2 sinks and sources across forest stands of varying age classes, clear-cut areas, mires, and lakes. Due to this heterogeneity and complexity, large uncertainties exist regarding the net CO2 balance at the landscape scale. In this study, we present the first estimate of the net CO2 exchange over a managed boreal landscape (∼68 km2) in northern Sweden, based on tall tower eddy covariance measurements. Our results suggest that from March 1, 2016 to February 28, 2018, the heterogeneous landscape was a net CO2 sink with a 2-year mean uptake of −87 ± 6 g C m−2 yr−1. Due to an earlier and warmer spring and sunnier autumn, the landscape was a stronger CO2 sink during the first year (−122 ± 8 g C m−2) compared to the second year (−52 ± 9 g C m−2). Footprint analysis shows that 87% of the CO2 flux measurements originated from forests, whereas mires, clear-cuts, lakes, and grassland contributed 11%, 1%, 0.7%, and 0.2%, respectively. Altogether, the CO2 sink strength of the heterogeneous landscape was up to 38% lower compared to the sink strength of a mature stand surrounding the tower. Overall, this study suggests that the managed boreal landscape acted as a CO2 sink and advocates tall tower eddy covariance measurements to improve regional carbon budget estimates.},
  author       = {Chi, Jinshu and Nilsson, Mats B. and Kljun, Natascha and Wallerman, Jörgen and Fransson, Johan and Laudon, Hjalmar and Lundmark, Tomas and Peichl, Matthias},
  issn         = {0168-1923},
  keyword      = {Boreal landscape,Tall tower eddy covariance,Footprint analysis,Land cover heterogeneity,CO2 Flux},
  language     = {eng},
  pages        = {29--41},
  publisher    = {Elsevier},
  series       = {Agricultural and Forest Meteorology},
  title        = {The carbon balance of a managed boreal landscape measured from a tall tower in northern Sweden},
  url          = {http://dx.doi.org/10.1016/j.agrformet.2019.04.010},
  volume       = {274},
  year         = {2019},
}