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Anders Lindroth

Professor emeritus

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Quantification of C uptake in subarctic birch forest after setback by an extreme insect outbreak

Författare

  • Michal Heliasz
  • Torbjörn Johansson
  • Anders Lindroth
  • Meelis Mölder
  • Mikhail Mastepanov
  • Thomas Friborg
  • Terry V. Callaghan
  • Torben Christensen

Summary, in English

The carbon dynamics of northern natural ecosystems contribute significantly to the global carbon balance. Periodic disturbances to these dynamics include insect herbivory. Larvae of autumn and winter moths (Epirrita autumnata and Operophtera brumata) defoliate mountain birch (Betula pubescens) forests in northern Scandinavia cyclically every 9-10 years and occasionally (50-150 years) extreme population densities can threaten ecosystem stability. Here we report impacts on C balance following a 2004 outbreak where a widespread area of Lake Tornetrask catchment was severely defoliated. We show that in the growing season of 2004 the forest was a much smaller net sink of C than in a reference year, most likely due to lower gross photosynthesis. Ecosystem respiration in 2004 was smaller and less sensitive to air temperature at nighttime relative to 2006. The difference in growing season uptake between an insect affected and non-affected year over the 316 km(2) area is in the order of 29 x 10(3) tonnes C equal to a reduction of the sink strength by 89%. Citation: Heliasz, M., T. Johansson, A. Lindroth, M. Molder, M. Mastepanov, T. Friborg, T. V. Callaghan, and T. R. Christensen (2011), Quantification of C uptake in subarctic birch forest after setback by an extreme insect outbreak, Geophys. Res. Lett., 38, L01704, doi:10.1029/2010GL044733.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap
  • eSSENCE: The e-Science Collaboration
  • MERGE: ModElling the Regional and Global Earth system
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publiceringsår

2011

Språk

Engelska

Publikation/Tidskrift/Serie

Geophysical Research Letters

Volym

38

Dokumenttyp

Artikel i tidskrift

Förlag

American Geophysical Union (AGU)

Ämne

  • Physical Geography

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 1944-8007