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New Insights Into Legacy Phosphorus From Fractionation of Streambed Sediment

Lannergård, Emma and Agstam-Norlin, Oskar and Huser, Brian and Sandström, Sara and Rakovic, Jelena and Futter, Martyn (2020). New Insights Into Legacy Phosphorus From Fractionation of Streambed Sediment. Journal of Geophysical Research: Biogeosciences. 125 , e2020JG005763
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Abstract

Streambed and lake sediment was studied in Savjaan, a eutrophic mesoscale catchment (722 km(2)) in central Sweden. Triplicate sediment cores from five lakes and nine streams, ranging from headwater to fourth order, were sampled. The sediment was analyzed with a sequential extraction method, where six different phosphorus (P) fractions were measured. The results showed that streambed sediments store considerable amounts of P and in some cases have comparable P contents (g/kg DW) to lake sediment. Land use, soil type, and drainage area (location in the catchment) had a significant effect on the different P fractions found in surficial sediments. Sediment from lakes and forested headwater streams generally had high proportions of organic P and iron bound P. In larger streams located in agricultural areas on clay soils closer to the catchment outlet, with dense sediment and a relatively low proportion of organic matter, P was to a larger extent bound to calcium. Streambed sediment may be an important catchment scale P store and should be considered when modeling catchment P dynamics. The large stores of streambed legacy P should also be considered when performing ditch maintenance to avoid unnecessary mobilization of bioavailable P.

Authors/Creators:Lannergård, Emma and Agstam-Norlin, Oskar and Huser, Brian and Sandström, Sara and Rakovic, Jelena and Futter, Martyn
Title:New Insights Into Legacy Phosphorus From Fractionation of Streambed Sediment
Series Name/Journal:Journal of Geophysical Research: Biogeosciences
Year of publishing :2020
Volume:125
Article number:e2020JG005763
Number of Pages:17
Publisher:AMER GEOPHYSICAL UNION
ISSN:2169-8953
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:catchment study, streambed sediment, phosphorus fractionation, internal loading, legacy phosphorus, ditch maintenance
URN:NBN:urn:nbn:se:slu:epsilon-p-108294
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108294
Additional ID:
Type of IDID
DOI10.1029/2020JG005763
Web of Science (WoS)000576409700005
ID Code:18729
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:25 Nov 2020 08:03
Metadata Last Modified:15 Jan 2021 19:26

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