P-cycling in sub-Arctic lakes – the importance of sediment release and retention
Oligotrophication is generally caused by a decreased nutrient availability, usually due to phosphorous limitation. This is a phenomenon impacting the entire food web and at worst causing cascading alterations within an ecosystem. Lakes of the Northern Hemisphere have lately been documented to be sub...
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2022
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ftsluppsalast:oai:stud.epsilon.slu.se:18227 2023-05-15T14:56:38+02:00 P-cycling in sub-Arctic lakes – the importance of sediment release and retention P-cykler i sub-Arktiska sjöar – betydelsen av hur sedimentens sammansättning påverkar mobilisering- och retentionspotential Ravry, Hanna 2022 https://stud.epsilon.slu.se/18227/ eng eng SLU/Dept. of Aquatic Sciences and Assessment https://stud.epsilon.slu.se/18227/ phosphorus sediment oligotrophication H1 2022 ftsluppsalast 2022-09-10T18:13:23Z Oligotrophication is generally caused by a decreased nutrient availability, usually due to phosphorous limitation. This is a phenomenon impacting the entire food web and at worst causing cascading alterations within an ecosystem. Lakes of the Northern Hemisphere have lately been documented to be subjected to oligotrophication (e.g., Arvola et al. 2011, Eimers et al. 2009, Huser et al. 2018). The decreasing P concentration trends have previously been coupled with e.g., vegetation and pH shifts within ecosystems as well as changes in biogeochemical processes due to climate change and global warming. In Sweden, the greatest declines have formerly been reported within the northern, alpine lakes that are already oligotrophic (Huser et al. 2018). The aim of this study is to elaborate the hitherto hypothesised pressures causing the changed P-cycling within sub-Arctic lakes, expanding on the possibility of global warming being the fundamental cause. Additionally, potentially increased P retention within sediment metal complexes was investigated. This possibility was evaluated by coupling water chemistry (1996-2021) and sediment subjected to P sequential extraction analysis. Seven sub-Arctic lakes and eight lowland lakes were investigated regarding the pressures of global warming to the P retention and release cycles. The sediment concentrations and water chemical analyse showed no indications of a temporary increased mobile (potentially releasable) sediment P pool, contrary to expectations. The water chemical analysis, on the other hand, adds further evidence to former studies, agreeing with the previously detected oligotrophication. The magnitude of the TP declines, however, seem to have weakened compared to results from prior studies of the same area. Nevertheless, the PO4-P concentrations have in the intermittent years further decreased to less than analytical detection limits, lending additional evidence to the ongoing oligotrophication of lakes within the Northern Hemisphere and alpine area specifically. A ... Other/Unknown Material Arctic Arktis* Climate change Global warming Swedish University of Agricultural Sciences: Epsilon Archive for Student Projects Arctic |
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Swedish University of Agricultural Sciences: Epsilon Archive for Student Projects |
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ftsluppsalast |
language |
English |
topic |
phosphorus sediment oligotrophication |
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phosphorus sediment oligotrophication Ravry, Hanna P-cycling in sub-Arctic lakes – the importance of sediment release and retention |
topic_facet |
phosphorus sediment oligotrophication |
description |
Oligotrophication is generally caused by a decreased nutrient availability, usually due to phosphorous limitation. This is a phenomenon impacting the entire food web and at worst causing cascading alterations within an ecosystem. Lakes of the Northern Hemisphere have lately been documented to be subjected to oligotrophication (e.g., Arvola et al. 2011, Eimers et al. 2009, Huser et al. 2018). The decreasing P concentration trends have previously been coupled with e.g., vegetation and pH shifts within ecosystems as well as changes in biogeochemical processes due to climate change and global warming. In Sweden, the greatest declines have formerly been reported within the northern, alpine lakes that are already oligotrophic (Huser et al. 2018). The aim of this study is to elaborate the hitherto hypothesised pressures causing the changed P-cycling within sub-Arctic lakes, expanding on the possibility of global warming being the fundamental cause. Additionally, potentially increased P retention within sediment metal complexes was investigated. This possibility was evaluated by coupling water chemistry (1996-2021) and sediment subjected to P sequential extraction analysis. Seven sub-Arctic lakes and eight lowland lakes were investigated regarding the pressures of global warming to the P retention and release cycles. The sediment concentrations and water chemical analyse showed no indications of a temporary increased mobile (potentially releasable) sediment P pool, contrary to expectations. The water chemical analysis, on the other hand, adds further evidence to former studies, agreeing with the previously detected oligotrophication. The magnitude of the TP declines, however, seem to have weakened compared to results from prior studies of the same area. Nevertheless, the PO4-P concentrations have in the intermittent years further decreased to less than analytical detection limits, lending additional evidence to the ongoing oligotrophication of lakes within the Northern Hemisphere and alpine area specifically. A ... |
format |
Other/Unknown Material |
author |
Ravry, Hanna |
author_facet |
Ravry, Hanna |
author_sort |
Ravry, Hanna |
title |
P-cycling in sub-Arctic lakes – the importance of sediment release and retention |
title_short |
P-cycling in sub-Arctic lakes – the importance of sediment release and retention |
title_full |
P-cycling in sub-Arctic lakes – the importance of sediment release and retention |
title_fullStr |
P-cycling in sub-Arctic lakes – the importance of sediment release and retention |
title_full_unstemmed |
P-cycling in sub-Arctic lakes – the importance of sediment release and retention |
title_sort |
p-cycling in sub-arctic lakes – the importance of sediment release and retention |
publisher |
SLU/Dept. of Aquatic Sciences and Assessment |
publishDate |
2022 |
url |
https://stud.epsilon.slu.se/18227/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arktis* Climate change Global warming |
genre_facet |
Arctic Arktis* Climate change Global warming |
op_relation |
https://stud.epsilon.slu.se/18227/ |
_version_ |
1766328714094706688 |