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Terrestrial export of highly bioavailable carbon from small boreal catchments in spring floods

Ågren, Anneli; Berggren, Martin LU ; Laudon, Hjalmar and Jansson, Mats (2008) In Freshwater Biology 53(5). p.964-972
Abstract
1. We assessed the terrestrial export of organic carbon, which effectively supported aquatic bacterial production (BP), from small boreal catchments during spring flood. We analysed stream runoff from nine small catchments with different proportions of peat mires and coniferous forests by monitoring the dissolved organic carbon (DOC) flux in combination with conducting bacterial bioassays.



2. Multiple linear regression analysis showed that BP during 7-day-dark bioassays (BP7; mu g C L(-1)day(-1)) was explained by both the quantity and quality (low-molecular weight fractions) of the DOC. BP7 can be used as a measure of export of terrestrial organic carbon that is highly bioavailable.



3. Total export... (More)
1. We assessed the terrestrial export of organic carbon, which effectively supported aquatic bacterial production (BP), from small boreal catchments during spring flood. We analysed stream runoff from nine small catchments with different proportions of peat mires and coniferous forests by monitoring the dissolved organic carbon (DOC) flux in combination with conducting bacterial bioassays.



2. Multiple linear regression analysis showed that BP during 7-day-dark bioassays (BP7; mu g C L(-1)day(-1)) was explained by both the quantity and quality (low-molecular weight fractions) of the DOC. BP7 can be used as a measure of export of terrestrial organic carbon that is highly bioavailable.



3. Total export of DOC during spring flood from the different catchments ranged from 20 to 27 kg ha(-1) and was negatively correlated to forest cover (%). However, the export of BP7 carbon was positively correlated to forest cover and varied from about 0.1 kg ha(-1) in mire-dominated streams to about 0.2 kg ha(-1) in forest-dominated streams.



4. The high bioavailability of forest carbon suggests that forests are the main contributors of BP-supporting carbon in boreal streams although mires have higher area-specific export of DOC. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
bacterial production, bioavailability, dissolved organic carbon, forests, mires
in
Freshwater Biology
volume
53
issue
5
pages
964 - 972
publisher
Wiley-Blackwell
external identifiers
  • scopus:41849116312
ISSN
0046-5070
DOI
10.1111/j.1365-2427.2008.01955.x
language
English
LU publication?
no
id
0b8fc432-a3d9-45f3-9bc1-5979e9a6009d (old id 2225786)
date added to LUP
2011-12-15 17:49:25
date last changed
2017-09-24 04:11:36
@article{0b8fc432-a3d9-45f3-9bc1-5979e9a6009d,
  abstract     = {1. We assessed the terrestrial export of organic carbon, which effectively supported aquatic bacterial production (BP), from small boreal catchments during spring flood. We analysed stream runoff from nine small catchments with different proportions of peat mires and coniferous forests by monitoring the dissolved organic carbon (DOC) flux in combination with conducting bacterial bioassays. <br/><br>
<br/><br>
2. Multiple linear regression analysis showed that BP during 7-day-dark bioassays (BP7; mu g C L(-1)day(-1)) was explained by both the quantity and quality (low-molecular weight fractions) of the DOC. BP7 can be used as a measure of export of terrestrial organic carbon that is highly bioavailable. <br/><br>
<br/><br>
3. Total export of DOC during spring flood from the different catchments ranged from 20 to 27 kg ha(-1) and was negatively correlated to forest cover (%). However, the export of BP7 carbon was positively correlated to forest cover and varied from about 0.1 kg ha(-1) in mire-dominated streams to about 0.2 kg ha(-1) in forest-dominated streams. <br/><br>
<br/><br>
4. The high bioavailability of forest carbon suggests that forests are the main contributors of BP-supporting carbon in boreal streams although mires have higher area-specific export of DOC.},
  author       = {Ågren, Anneli and Berggren, Martin and Laudon, Hjalmar and Jansson, Mats},
  issn         = {0046-5070},
  keyword      = {bacterial production,bioavailability,dissolved organic carbon,forests,mires},
  language     = {eng},
  number       = {5},
  pages        = {964--972},
  publisher    = {Wiley-Blackwell},
  series       = {Freshwater Biology},
  title        = {Terrestrial export of highly bioavailable carbon from small boreal catchments in spring floods},
  url          = {http://dx.doi.org/10.1111/j.1365-2427.2008.01955.x},
  volume       = {53},
  year         = {2008},
}