The impact of climate change and eutrophication on phosphorus forms in sediment: Results from a long-term lake mesocosm experiment
Laen...
Kuupäev
2022
Kättesaadav alates
12.02.2024
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Elsevier
Abstrakt
Characteristics of bottom sediments in lake mesocosms 11 years after starting the experiment were studied in order to
determine the effects of nutrient loading, temperature increase and vegetation type on concentration and vertical dis-
tribution of phosphorus (P) forms. The experimental setup consisted of 24 outdoor flow-through mesocosms with two
nutrient treatments – low (L) and high (H) and 3 temperature levels – ambient (T0), heated by 2–4 °C (T1) and 3–6 °C
(T2) in four replicates. Thickness of the organic sediment was measured and the sediment analysed for dry weight, or-
ganic matter, and P fractions (according to a sequential extraction scheme) and organic P compounds (by ³¹P nuclear
magnetic resonance spectroscopy). Higher nutrient loading led to increased sediment accumulation and higher con-
centration of total P and most P fractions, except P bound to aluminium and humic matter. The dominant vegetation
type covaried with nutrient levels. Vertical gradients in Ca bound P and mobile P in low nutrient mesocosms was per-
haps a result of P coprecipitation with calcite on macrophytes and P uptake by roots indicating that in macrophyte-rich
lakes, plants can be important modifiers of early P diagenesis. Temperature alone did not significantly affect sediment
accumulation rate but the interaction effect between nutrient and temperature treatments was significant. At high nu-
trient loading, sediment thickness decreased with increasing temperature, but at low nutrient loading, it increased
with warming. The effect of warming on sediment composition became obvious only in nutrient enriched mesocosms
showing that eutrophication makes shallow lake ecosystems more susceptible to climate change.
Katrin Saar study visit to SDU was supported by ESF DoRa Programme Activity 6 and SA Archimedes and by Centre for Lake Restoration, a Villum Centre of Excellence. Data analysis for the present paper was supported by the European Union H2020 WIDESPREAD grant 951963 (TREICLAKE) and by the Estonian Science Foundation grant PRG1167. Erik Jeppesen was supported by the TÜBITAK program BIDEB2232 (project 118C250), and Erik Jeppesen, Martin Søndergaard and Torben Lauridsen by the EU Horizon 2020 project AQUACOSMplus and AnaEE-Denmark. The authors thank two anonymous referees for constructive comments to the first version of the manuscript.
Supplementary data to this article can be found online at https://doi. org/10.1016/j.scitotenv.2022.153751.
Katrin Saar study visit to SDU was supported by ESF DoRa Programme Activity 6 and SA Archimedes and by Centre for Lake Restoration, a Villum Centre of Excellence. Data analysis for the present paper was supported by the European Union H2020 WIDESPREAD grant 951963 (TREICLAKE) and by the Estonian Science Foundation grant PRG1167. Erik Jeppesen was supported by the TÜBITAK program BIDEB2232 (project 118C250), and Erik Jeppesen, Martin Søndergaard and Torben Lauridsen by the EU Horizon 2020 project AQUACOSMplus and AnaEE-Denmark. The authors thank two anonymous referees for constructive comments to the first version of the manuscript.
Supplementary data to this article can be found online at https://doi. org/10.1016/j.scitotenv.2022.153751.
Kirjeldus
Article history: Received 3 December 2021; Received in revised form 16 January 2022; Accepted 4 February 2022; Available online 12 February 2022; Editor: Ouyang Wei
Märksõnad
shallow lake, sediment accumulation, temperature gradient, nutrient load, macrophytes, ³¹P NMR, sequential extraction, P-pools, articles