Sediment phosphorus mobility in Vortsjarv, a large shallow lake : Insights from phosphorus sorption experiments and long-term monitoring

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Tammeorg , O , Nurnberg , G K , Tonno , I , Kisand , A , Tuvikene , L , Noges , T & Noges , P 2022 , ' Sediment phosphorus mobility in Vortsjarv, a large shallow lake : Insights from phosphorus sorption experiments and long-term monitoring ' , Science of the Total Environment , vol. 829 , 154572 . https://doi.org/10.1016/j.scitotenv.2022.154572

Title: Sediment phosphorus mobility in Vortsjarv, a large shallow lake : Insights from phosphorus sorption experiments and long-term monitoring
Author: Tammeorg, Olga; Nurnberg, Gertrud K.; Tonno, Ilmar; Kisand, Anu; Tuvikene, Lea; Noges, Tiina; Noges, Peeter
Contributor organization: University of Helsinki
Ecosystems and Environment Research Programme
Date: 2022-07-10
Language: eng
Number of pages: 8
Belongs to series: Science of the Total Environment
ISSN: 0048-9697
DOI: https://doi.org/10.1016/j.scitotenv.2022.154572
URI: http://hdl.handle.net/10138/344514
Abstract: Sediment phosphorus (P) recycling is one of the key issues in lake water quality management. We studied sediment P mobility in Vortsjarv, a large shallow lake in Estonia using both sorption experiments and long-term (1985-2020) monitoring data of the lake. Over the years studied, the lake has undergone a dedine in external phosphorus loading (EL), while no improvement in phytoplankton indicators was observed. The results of the sorption experiments revealed that it may be successfully used as a tool to determine P forms involved in P retention, as up to 100% of the P from the water column was detected in sediments. Incubation of wet sediment is preferred to dry because of the sensitivity of organic P to desiccation. In the sediments of Vortsjarv, the labile P (Lab-P) and iron bound (Fe-P) fractions are the major forms of the mobile pool that supply internal P load as sediment released P. The internal P load calculated from summer total P (TP) increases (ILin situ) in the water column was on average 42%, but could reach 240% of EL at extreme environmental conditions. ILin situ was correlated with the active area, which resembles the area involved in redox-related P release in polymictic lakes, and with the mean bottom shear stress in summer. ILin situ showed a similar decreasing pattern as the external P load over the years 1985-2020, and was likely driven by the decrease of the pool of releasable P. Similarly, the decreases in sediment loading by P retention in our P sorption experiment were associated with decreases in the concentration of the potentially mobile P forms (mainly lab-P and Fe-P). These results show that changes in external P loading can successfully control internal P loading and are useful in water quality management of large lakes.
Subject: Internal phosphorus loading
External loading
P sorption experiments
Redox-related release
Active phosphorus release area
Sediment resuspension
Vortsjarv
EUTROPHIC LAKE
PHOSPHATE RELEASE
ANOXIC SEDIMENTS
WATER-QUALITY
LOAD
QUANTIFICATION
VARIABILITY
ADSORPTION
DYNAMICS
BALATON
1172 Environmental sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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