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Bioavailable phosph...
Bioavailable phosphorus in humic headwater streams in boreal Sweden
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- Jansson, Mats (författare)
- Umeå universitet,Umeå University,Institutionen för ekologi, miljö och geovetenskap
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- Berggren, Martin (författare)
- Lund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science
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- Laudon, Hjalmar (författare)
- Sveriges lantbruksuniversitet,Swedish University of Agricultural Sciences,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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- Jonsson, Anders (författare)
- Umeå universitet,Umeå University,Institutionen för ekologi, miljö och geovetenskap
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(creator_code:org_t)
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- 2012-07-22
- 2012
- Engelska.
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Ingår i: Limnology and Oceanography. - : Wiley. - 1939-5590 .- 0024-3590. ; 57:4, s. 1161-1170
- Relaterad länk:
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http://dx.doi.org/10...
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https://aslopubs.onl...
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https://lup.lub.lu.s...
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https://doi.org/10.4...
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https://res.slu.se/i...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Skogsvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Forest Science (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Nyckelord
- DISSOLVED ORGANIC-CARBON
- BACTERIOPLANKTON PRODUCTION
- TERRESTRIAL SOURCES
- IRON ACCUMULATION
- HUMUS LAYER
- LAKES
- LIMITATION
- PHYTOPLANKTON
- PHOSPHATE
- ALUMINUM
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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