Simulated drawdown and rewetting of littoral sediments

implications for Lobelia lake management

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

This study aims to answer the question if temporary drawdowns could be a beneficial restoration measure for endangered Lobelia lakes. Intact littoral sediment cores with and without plants were used to simulate a drawdown over an almost 5 months period and a subsequent rewetting. During drawdown, the initial low saturation of sorption sites for phosphorus (P) increased due to increased contents of mobile P forms in the surface layers. Contents of P binding iron forms remained constant. The increase of mobile P forms was mostly derived from decayed plant material since the experimental set up caused dying of plants. Upon rewetting effluxes of total dissolved phosphorus and dissolved organic carbon were observed which are most likely attributable to the degraded plant material. A phosphorus uptake experiment with dried and rewetted sediment cores without plants showed that the initial high P binding capacity had been retained during drying and rewetting. These findings were confirmed by a small scale long-term drying (348 days) and rewetting (228 days) experiment which overall did not show a significant reduction in P adsorption capacity. Therefore, drawdowns can be an appropriate restoration measure for endangered Lobelia lakes given that the isoetid plants spread during the drying period.
OriginalsprogEngelsk
TidsskriftHydrobiologia
Vol/bind778
Udgave nummer1
Sider (fra-til)137-150
ISSN0018-8158
DOI
StatusUdgivet - 2016

Fingeraftryk

Lobelia
rewetting
drawdown
Lakes
Phosphorus
Drying
Sediments
lakes
sediments
Restoration
lake
sediment
drying
Organic carbon
phosphorus
sediment core
Sorption
Experiments
Iron
Adsorption

Citer dette

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title = "Simulated drawdown and rewetting of littoral sediments: implications for Lobelia lake management",
abstract = "This study aims to answer the question if temporary drawdowns could be a beneficial restoration measure for endangered Lobelia lakes. Intact littoral sediment cores with and without plants were used to simulate a drawdown over an almost 5 months period and a subsequent rewetting. During drawdown, the initial low saturation of sorption sites for phosphorus (P) increased due to increased contents of mobile P forms in the surface layers. Contents of P binding iron forms remained constant. The increase of mobile P forms was mostly derived from decayed plant material since the experimental set up caused dying of plants. Upon rewetting effluxes of total dissolved phosphorus and dissolved organic carbon were observed which are most likely attributable to the degraded plant material. A phosphorus uptake experiment with dried and rewetted sediment cores without plants showed that the initial high P binding capacity had been retained during drying and rewetting. These findings were confirmed by a small scale long-term drying (348 days) and rewetting (228 days) experiment which overall did not show a significant reduction in P adsorption capacity. Therefore, drawdowns can be an appropriate restoration measure for endangered Lobelia lakes given that the isoetid plants spread during the drying period.",
keywords = "Drying-out, Isoetids , Lake restoration, Long-term drying experiment, Phosphate binding capacity, Phosphorus sorption",
author = "Anna-Marie Klamt and Kasper Reitzel and Andersen, {Frede {\O}stergaard} and Jensen, {Henning S.}",
year = "2016",
doi = "10.1007/s10750-015-2619-0",
language = "English",
volume = "778",
pages = "137--150",
journal = "Hydrobiologia",
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Simulated drawdown and rewetting of littoral sediments : implications for Lobelia lake management. / Klamt, Anna-Marie; Reitzel, Kasper; Andersen, Frede Østergaard; Jensen, Henning S.

I: Hydrobiologia, Bind 778, Nr. 1, 2016, s. 137-150.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Simulated drawdown and rewetting of littoral sediments

T2 - implications for Lobelia lake management

AU - Klamt, Anna-Marie

AU - Reitzel, Kasper

AU - Andersen, Frede Østergaard

AU - Jensen, Henning S.

PY - 2016

Y1 - 2016

N2 - This study aims to answer the question if temporary drawdowns could be a beneficial restoration measure for endangered Lobelia lakes. Intact littoral sediment cores with and without plants were used to simulate a drawdown over an almost 5 months period and a subsequent rewetting. During drawdown, the initial low saturation of sorption sites for phosphorus (P) increased due to increased contents of mobile P forms in the surface layers. Contents of P binding iron forms remained constant. The increase of mobile P forms was mostly derived from decayed plant material since the experimental set up caused dying of plants. Upon rewetting effluxes of total dissolved phosphorus and dissolved organic carbon were observed which are most likely attributable to the degraded plant material. A phosphorus uptake experiment with dried and rewetted sediment cores without plants showed that the initial high P binding capacity had been retained during drying and rewetting. These findings were confirmed by a small scale long-term drying (348 days) and rewetting (228 days) experiment which overall did not show a significant reduction in P adsorption capacity. Therefore, drawdowns can be an appropriate restoration measure for endangered Lobelia lakes given that the isoetid plants spread during the drying period.

AB - This study aims to answer the question if temporary drawdowns could be a beneficial restoration measure for endangered Lobelia lakes. Intact littoral sediment cores with and without plants were used to simulate a drawdown over an almost 5 months period and a subsequent rewetting. During drawdown, the initial low saturation of sorption sites for phosphorus (P) increased due to increased contents of mobile P forms in the surface layers. Contents of P binding iron forms remained constant. The increase of mobile P forms was mostly derived from decayed plant material since the experimental set up caused dying of plants. Upon rewetting effluxes of total dissolved phosphorus and dissolved organic carbon were observed which are most likely attributable to the degraded plant material. A phosphorus uptake experiment with dried and rewetted sediment cores without plants showed that the initial high P binding capacity had been retained during drying and rewetting. These findings were confirmed by a small scale long-term drying (348 days) and rewetting (228 days) experiment which overall did not show a significant reduction in P adsorption capacity. Therefore, drawdowns can be an appropriate restoration measure for endangered Lobelia lakes given that the isoetid plants spread during the drying period.

KW - Drying-out

KW - Isoetids

KW - Lake restoration

KW - Long-term drying experiment

KW - Phosphate binding capacity

KW - Phosphorus sorption

U2 - 10.1007/s10750-015-2619-0

DO - 10.1007/s10750-015-2619-0

M3 - Journal article

VL - 778

SP - 137

EP - 150

JO - Hydrobiologia

JF - Hydrobiologia

SN - 0018-8158

IS - 1

ER -