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Nitin Chaudhary

Postdoktor

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

Författare

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

Summary, in English

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.

Avdelning/ar

  • BECC: Biodiversity and Ecosystem services in a Changing Climate
  • Institutionen för naturgeografi och ekosystemvetenskap
  • MERGE: ModElling the Regional and Global Earth system

Publiceringsår

2022-09

Språk

Engelska

Publikation/Tidskrift/Serie

Journal of Geophysical Research: Biogeosciences

Volym

127

Issue

9

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley

Ämne

  • Physical Geography

Nyckelord

  • boreal
  • carbon
  • heterogeneity
  • landscape
  • peatland
  • radiative effect

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 2169-8953