Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape

Kou, Dan; Virtanen, Tarmo; Treat, Claire C.; Tuovinen, Juha Pekka; Räsänen, Aleksi; Juutinen, Sari; Mikola, Juha; Aurela, Mika; Heiskanen, Lauri; Heikkilä, Maija; Weckström, Jan; Juselius, Teemu; Piilo, Sanna R.; Deng, Jia; Zhang, Yu; Chaudhary, Nitin; Huang, Conghong; Väliranta, Minna; Biasi, Christina; Liu, Xiangyu; Guo, Mingyang; Zhuang, Qianlai; Korhola, Atte; Shurpali, Narasinha J.

Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape

Mark

Kou, Dan ; Virtanen, Tarmo ; Treat, Claire C. ; Tuovinen, Juha Pekka ; Räsänen, Aleksi ; Juutinen, Sari ; Mikola, Juha ; Aurela, Mika ; Heiskanen, Lauri and Heikkilä, Maija , et al. (2022) In Journal of Geophysical Research: Biogeosciences 127(9).

Abstract: Peatlands, with high spatial variability in ecotypes and microforms, constitute a significant part of the boreal landscape and play an important role in the global carbon (C) cycle. However, the effects of this peatland heterogeneity within the boreal landscape are rarely quantified. Here, we use field-based measurements, high-resolution land cover classification, and biogeochemical and atmospheric models to estimate the atmosphere-ecosystem C fluxes and the corresponding radiative effect (RE) for a boreal landscape (Kaamanen) in northern Finland. Our result shows that the Kaamanen catchment currently functioned as a sink of carbon dioxide (CO₂) and a source of methane (CH₄). Peatlands (26% of the area) contributed... (More); Peatlands, with high spatial variability in ecotypes and microforms, constitute a significant part of the boreal landscape and play an important role in the global carbon (C) cycle. However, the effects of this peatland heterogeneity within the boreal landscape are rarely quantified. Here, we use field-based measurements, high-resolution land cover classification, and biogeochemical and atmospheric models to estimate the atmosphere-ecosystem C fluxes and the corresponding radiative effect (RE) for a boreal landscape (Kaamanen) in northern Finland. Our result shows that the Kaamanen catchment currently functioned as a sink of carbon dioxide (CO₂) and a source of methane (CH₄). Peatlands (26% of the area) contributed 22% of the total CO₂ uptake and 89% of CH₄ emissions; forests (61%) accounted for 78% of CO₂ uptake and offset 6% of CH₄ emissions; water bodies (13%) offset 7% of CO₂ uptake and contributed 11% of CH₄ emissions. The heterogeneity of peatlands accounted for 11%, 88%, and 75% of the area-weighted variability (deviation from the area-weighted mean among different land cover types (LCTs) within the catchment) in CO₂ flux, CH₄ flux, and the combined RE of CO₂ and CH₄ exchanges over the 25-year time horizon, respectively. Aggregating peatland LCTs or misclassifying them as nonpeatland LCTs can significantly (p < 0.05) bias the regional CH₄ exchange and RE estimates, while differentiating between drier noninundated and wetter inundated peatlands can effectively reduce the bias. Current land cover products lack such details in peatland heterogeneity, which would be needed to better constrain boreal C budgets and global C-climate feedbacks.
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Please use this url to cite or link to this publication: https://lup.lub.lu.se/record/dafb5236-7e81-489b-8eed-6f08a3a999fa

author

Kou, Dan ; Virtanen, Tarmo ; Treat, Claire C. ; Tuovinen, Juha Pekka ; Räsänen, Aleksi ; Juutinen, Sari ; Mikola, Juha ; Aurela, Mika ; Heiskanen, Lauri and Heikkilä, Maija , et al. (More)

Kou, Dan ; Virtanen, Tarmo ; Treat, Claire C. ; Tuovinen, Juha Pekka ; Räsänen, Aleksi ; Juutinen, Sari ; Mikola, Juha ; Aurela, Mika ; Heiskanen, Lauri ; Heikkilä, Maija ; Weckström, Jan ; Juselius, Teemu ; Piilo, Sanna R. ; Deng, Jia ; Zhang, Yu ; Chaudhary, Nitin ^LU

; Huang, Conghong ; Väliranta, Minna ; Biasi, Christina ; Liu, Xiangyu ; Guo, Mingyang ; Zhuang, Qianlai ; Korhola, Atte and Shurpali, Narasinha J. (Less)

organization

publishing date

2022-09

type

Contribution to journal

publication status

published

subject

Physical Geography

keywords

boreal, carbon, heterogeneity, landscape, peatland, radiative effect

in

Journal of Geophysical Research: Biogeosciences

volume

127

issue

9

article number

e2021JG006774

publisher

Wiley

external identifiers

scopus:85139094462

ISSN

2169-8953

DOI

10.1029/2021JG006774

language

English

LU publication?

yes

id

dafb5236-7e81-489b-8eed-6f08a3a999fa

date added to LUP

2022-12-12 10:47:13

date last changed

2023-10-03 11:43:15

@article{dafb5236-7e81-489b-8eed-6f08a3a999fa,
  abstract     = {{<p>Peatlands, with high spatial variability in ecotypes and microforms, constitute a significant part of the boreal landscape and play an important role in the global carbon (C) cycle. However, the effects of this peatland heterogeneity within the boreal landscape are rarely quantified. Here, we use field-based measurements, high-resolution land cover classification, and biogeochemical and atmospheric models to estimate the atmosphere-ecosystem C fluxes and the corresponding radiative effect (RE) for a boreal landscape (Kaamanen) in northern Finland. Our result shows that the Kaamanen catchment currently functioned as a sink of carbon dioxide (CO<sub>2</sub>) and a source of methane (CH<sub>4</sub>). Peatlands (26% of the area) contributed 22% of the total CO<sub>2</sub> uptake and 89% of CH<sub>4</sub> emissions; forests (61%) accounted for 78% of CO<sub>2</sub> uptake and offset 6% of CH<sub>4</sub> emissions; water bodies (13%) offset 7% of CO<sub>2</sub> uptake and contributed 11% of CH<sub>4</sub> emissions. The heterogeneity of peatlands accounted for 11%, 88%, and 75% of the area-weighted variability (deviation from the area-weighted mean among different land cover types (LCTs) within the catchment) in CO<sub>2</sub> flux, CH<sub>4</sub> flux, and the combined RE of CO<sub>2</sub> and CH<sub>4</sub> exchanges over the 25-year time horizon, respectively. Aggregating peatland LCTs or misclassifying them as nonpeatland LCTs can significantly (p &lt; 0.05) bias the regional CH<sub>4</sub> exchange and RE estimates, while differentiating between drier noninundated and wetter inundated peatlands can effectively reduce the bias. Current land cover products lack such details in peatland heterogeneity, which would be needed to better constrain boreal C budgets and global C-climate feedbacks.</p>}},
  author       = {{Kou, Dan and Virtanen, Tarmo and Treat, Claire C. and Tuovinen, Juha Pekka and Räsänen, Aleksi and Juutinen, Sari and Mikola, Juha and Aurela, Mika and Heiskanen, Lauri and Heikkilä, Maija and Weckström, Jan and Juselius, Teemu and Piilo, Sanna R. and Deng, Jia and Zhang, Yu and Chaudhary, Nitin and Huang, Conghong and Väliranta, Minna and Biasi, Christina and Liu, Xiangyu and Guo, Mingyang and Zhuang, Qianlai and Korhola, Atte and Shurpali, Narasinha J.}},
  issn         = {{2169-8953}},
  keywords     = {{boreal; carbon; heterogeneity; landscape; peatland; radiative effect}},
  language     = {{eng}},
  number       = {{9}},
  publisher    = {{Wiley}},
  series       = {{Journal of Geophysical Research: Biogeosciences}},
  title        = {{Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape}},
  url          = {{http://dx.doi.org/10.1029/2021JG006774}},
  doi          = {{10.1029/2021JG006774}},
  volume       = {{127}},
  year         = {{2022}},
}

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Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape