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Bioavailable phosphorus in humic headwater streams in boreal Sweden

Jansson, Mats; Berggren, Martin LU ; Laudon, Hjalmar and Jonsson, Anders (2012) In Limnology and Oceanography 57(4). p.1161-1170
Abstract
Bioavailable phosphorus (BAP) concentrations were determined nine times between April and October 2010 in two humic boreal headwater streams draining forest-and mire-dominated catchments. BAP was analyzed in a bioassay in which natural P-limited bacterioplankton grew with natural P as the sole P source. In both streams, approximately 90% of the BAP occurred as dissolved species (passing a 0.2-mu m filter), consisting partly of low-molecular-weight forms (passing a filter with nominal cutoff at 1 kDa) and partly of high-molecular-weight forms (passing a 0.2-mu m filter but not a 1-kDa filter). Concentrations of total dissolved BAP varied between 1 mu g L-1 and 14 mu g L-1, with the highest values in the middle of the summer. Compared to the... (More)
Bioavailable phosphorus (BAP) concentrations were determined nine times between April and October 2010 in two humic boreal headwater streams draining forest-and mire-dominated catchments. BAP was analyzed in a bioassay in which natural P-limited bacterioplankton grew with natural P as the sole P source. In both streams, approximately 90% of the BAP occurred as dissolved species (passing a 0.2-mu m filter), consisting partly of low-molecular-weight forms (passing a filter with nominal cutoff at 1 kDa) and partly of high-molecular-weight forms (passing a 0.2-mu m filter but not a 1-kDa filter). Concentrations of total dissolved BAP varied between 1 mu g L-1 and 14 mu g L-1, with the highest values in the middle of the summer. Compared to the forest stream, BAP concentrations were generally higher in the mire stream, where it occasionally amounted to nearly 50% of total P. Molybdate reactive phosphorus overestimated BAP considerably. Most of the BAP was in forms other than free orthophosphate. Temporal BAP variations showed no relationships with dissolved organic carbon (C) or iron but were positively related to air temperature and negatively related to the absorbance ratio (a254 : a365) of organic compounds in the water, indicating connections between terrestrial export of BAP and temperature-dependent terrestrial C metabolism. Concentrations of BAP can relieve stream bacteria from P limitation, and a significant share of BAP exported to streams can reach and be used in downstream lakes. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
DISSOLVED ORGANIC-CARBON, BACTERIOPLANKTON PRODUCTION, TERRESTRIAL SOURCES, IRON ACCUMULATION, HUMUS LAYER, LAKES, LIMITATION, PHYTOPLANKTON, PHOSPHATE, ALUMINUM
in
Limnology and Oceanography
volume
57
issue
4
pages
1161 - 1170
publisher
ASLO
external identifiers
  • wos:000307269300021
  • scopus:84911471559
ISSN
1939-5590
DOI
10.4319/lo.2012.57.4.1161
project
BECC
language
English
LU publication?
yes
id
541a2139-c9d8-4cdf-bd66-39095d787f55 (old id 3055004)
date added to LUP
2012-11-27 14:41:40
date last changed
2017-04-30 10:49:45
@article{541a2139-c9d8-4cdf-bd66-39095d787f55,
  abstract     = {Bioavailable phosphorus (BAP) concentrations were determined nine times between April and October 2010 in two humic boreal headwater streams draining forest-and mire-dominated catchments. BAP was analyzed in a bioassay in which natural P-limited bacterioplankton grew with natural P as the sole P source. In both streams, approximately 90% of the BAP occurred as dissolved species (passing a 0.2-mu m filter), consisting partly of low-molecular-weight forms (passing a filter with nominal cutoff at 1 kDa) and partly of high-molecular-weight forms (passing a 0.2-mu m filter but not a 1-kDa filter). Concentrations of total dissolved BAP varied between 1 mu g L-1 and 14 mu g L-1, with the highest values in the middle of the summer. Compared to the forest stream, BAP concentrations were generally higher in the mire stream, where it occasionally amounted to nearly 50% of total P. Molybdate reactive phosphorus overestimated BAP considerably. Most of the BAP was in forms other than free orthophosphate. Temporal BAP variations showed no relationships with dissolved organic carbon (C) or iron but were positively related to air temperature and negatively related to the absorbance ratio (a254 : a365) of organic compounds in the water, indicating connections between terrestrial export of BAP and temperature-dependent terrestrial C metabolism. Concentrations of BAP can relieve stream bacteria from P limitation, and a significant share of BAP exported to streams can reach and be used in downstream lakes.},
  author       = {Jansson, Mats and Berggren, Martin and Laudon, Hjalmar and Jonsson, Anders},
  issn         = {1939-5590},
  keyword      = {DISSOLVED ORGANIC-CARBON,BACTERIOPLANKTON PRODUCTION,TERRESTRIAL SOURCES,IRON ACCUMULATION,HUMUS LAYER,LAKES,LIMITATION,PHYTOPLANKTON,PHOSPHATE,ALUMINUM},
  language     = {eng},
  number       = {4},
  pages        = {1161--1170},
  publisher    = {ASLO},
  series       = {Limnology and Oceanography},
  title        = {Bioavailable phosphorus in humic headwater streams in boreal Sweden},
  url          = {http://dx.doi.org/10.4319/lo.2012.57.4.1161},
  volume       = {57},
  year         = {2012},
}