Quantification of C uptake in subarctic birch forest after setback by an extreme insect outbreak
(2011) In Geophysical Research Letters 38.- Abstract
- 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.... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1882565
- author
- Heliasz, Michal LU ; Johansson, Torbjörn LU ; Lindroth, Anders LU ; Mölder, Meelis LU ; Mastepanov, Mikhail LU ; Friborg, Thomas ; Callaghan, Terry V. and Christensen, Torben LU
- organization
- publishing date
- 2011
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Geophysical Research Letters
- volume
- 38
- publisher
- American Geophysical Union (AGU)
- external identifiers
-
- wos:000286323300001
- scopus:78751542066
- ISSN
- 1944-8007
- DOI
- 10.1029/2010GL044733
- language
- English
- LU publication?
- yes
- id
- a777a2cd-bcd9-441b-a496-83300668aa8b (old id 1882565)
- date added to LUP
- 2016-04-01 13:46:04
- date last changed
- 2024-01-09 18:24:59
@article{a777a2cd-bcd9-441b-a496-83300668aa8b, abstract = {{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.}}, author = {{Heliasz, Michal and Johansson, Torbjörn and Lindroth, Anders and Mölder, Meelis and Mastepanov, Mikhail and Friborg, Thomas and Callaghan, Terry V. and Christensen, Torben}}, issn = {{1944-8007}}, language = {{eng}}, publisher = {{American Geophysical Union (AGU)}}, series = {{Geophysical Research Letters}}, title = {{Quantification of C uptake in subarctic birch forest after setback by an extreme insect outbreak}}, url = {{http://dx.doi.org/10.1029/2010GL044733}}, doi = {{10.1029/2010GL044733}}, volume = {{38}}, year = {{2011}}, }