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Links between terrestrial primary production and bacterial production and respiration in lakes in a climate gradient in subarctic Sweden

Jansson, M.; Hickler, Thomas LU ; Jonsson, A. and Karlsson, A. (2008) In Ecosystems 11(3). p.367-376
Abstract (Swedish)
Abstract in Undetermined

We compared terrestrial net primary production (NPP) and terrestrial export of dissolved organic carbon (DOC) with lake water heterotrophic bacterial activity in 12 headwater lake catchments along an altitude gradient in subarctic Sweden. Modelled NPP declined strongly with altitude and annual air temperature decreases along the altitude gradient (6C between the warmest and the coldest catchment). Estimated terrestrial DOC export to the lakes was closely correlated to NPP. Heterotrophic bacterial production (BP) and respiration (BR) were mainly based on terrestrial organic carbon and strongly correlated with the terrestrial DOC export. Excess respiration over PP of the pelagic system was similar to... (More)
Abstract in Undetermined

We compared terrestrial net primary production (NPP) and terrestrial export of dissolved organic carbon (DOC) with lake water heterotrophic bacterial activity in 12 headwater lake catchments along an altitude gradient in subarctic Sweden. Modelled NPP declined strongly with altitude and annual air temperature decreases along the altitude gradient (6C between the warmest and the coldest catchment). Estimated terrestrial DOC export to the lakes was closely correlated to NPP. Heterotrophic bacterial production (BP) and respiration (BR) were mainly based on terrestrial organic carbon and strongly correlated with the terrestrial DOC export. Excess respiration over PP of the pelagic system was similar to net emission of CO2 in the lakes. BR and CO2 emission made up considerably higher shares of the terrestrial DOC input in warm lakes than in cold lakes, implying that respiration and the degree of net heterotrophy in the lakes were dependant not only on terrestrial export of DOC, but also on characteristics in the lakes which changed along the gradient and affected the bacterial metabolization of allochthonous DOC. The study showed close links between terrestrial primary production, terrestrial DOC export and bacterial activity in lakes and how these relationships were dependant on air temperature. Increases in air temperature in high latitude unproductive systems might have considerable consequences for lake water productivity and release of CO2 to the atmosphere, which are ultimately determined by terrestrial primary production. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
terrestrial primary production, subarctic, mineralization, lakes, bacterioplankton, terrestrial DOC export
in
Ecosystems
volume
11
issue
3
pages
367 - 376
publisher
Springer
external identifiers
  • wos:000255537400002
  • scopus:43049158162
ISSN
1432-9840
DOI
10.1007/s10021-008-9127-2
language
English
LU publication?
yes
id
5ed16cd4-846a-4267-822c-9cf1da79a5a3 (old id 642693)
date added to LUP
2007-12-14 12:47:44
date last changed
2017-10-01 03:45:54
@article{5ed16cd4-846a-4267-822c-9cf1da79a5a3,
  abstract     = {<b>Abstract in Undetermined</b><br/><br>
We compared terrestrial net primary production (NPP) and terrestrial export of dissolved organic carbon (DOC) with lake water heterotrophic bacterial activity in 12 headwater lake catchments along an altitude gradient in subarctic Sweden. Modelled NPP declined strongly with altitude and annual air temperature decreases along the altitude gradient (6C between the warmest and the coldest catchment). Estimated terrestrial DOC export to the lakes was closely correlated to NPP. Heterotrophic bacterial production (BP) and respiration (BR) were mainly based on terrestrial organic carbon and strongly correlated with the terrestrial DOC export. Excess respiration over PP of the pelagic system was similar to net emission of CO2 in the lakes. BR and CO2 emission made up considerably higher shares of the terrestrial DOC input in warm lakes than in cold lakes, implying that respiration and the degree of net heterotrophy in the lakes were dependant not only on terrestrial export of DOC, but also on characteristics in the lakes which changed along the gradient and affected the bacterial metabolization of allochthonous DOC. The study showed close links between terrestrial primary production, terrestrial DOC export and bacterial activity in lakes and how these relationships were dependant on air temperature. Increases in air temperature in high latitude unproductive systems might have considerable consequences for lake water productivity and release of CO2 to the atmosphere, which are ultimately determined by terrestrial primary production.},
  author       = {Jansson, M. and Hickler, Thomas and Jonsson, A. and Karlsson, A.},
  issn         = {1432-9840},
  keyword      = {terrestrial primary production,subarctic,mineralization,lakes,bacterioplankton,terrestrial DOC export},
  language     = {eng},
  number       = {3},
  pages        = {367--376},
  publisher    = {Springer},
  series       = {Ecosystems},
  title        = {Links between terrestrial primary production and bacterial production and respiration in lakes in a climate gradient in subarctic Sweden},
  url          = {http://dx.doi.org/10.1007/s10021-008-9127-2},
  volume       = {11},
  year         = {2008},
}