Biogeochemical causes of sixty-year trends and seasonal variations of river water properties in a large European basin

We evaluated long-term trends and seasonal variations in the major physical–chemical properties of the circum-neutral Slapy reservoir (Vltava, Czech Republic) from 1960 to 2019. Mean annual water temperature increased by 2.1 °C, flow maxima shifted by ~ 13 days from the early April to mid-March, and...

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Veröffentlicht in:Biogeochemistry 2021-05, Vol.154 (1), p.81-98
Hauptverfasser: Kopáček, Jiří, Hejzlar, Josef, Porcal, Petr, Znachor, Petr
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creator Kopáček, Jiří
Hejzlar, Josef
Porcal, Petr
Znachor, Petr
description We evaluated long-term trends and seasonal variations in the major physical–chemical properties of the circum-neutral Slapy reservoir (Vltava, Czech Republic) from 1960 to 2019. Mean annual water temperature increased by 2.1 °C, flow maxima shifted by ~ 13 days from the early April to mid-March, and the onset of thermal stratification of water column and spring algal peaks advanced by 19 and 21 days, respectively, due to climate warming. Concentrations of major ions, phosphorus (P), and chlorophyll increased from the 1960s to the 1990–2000s, then decreased due to changing agricultural practices and legislation, intensified wastewater treatment, and decreasing atmospheric pollution. Concentrations of dissolved organic carbon (DOC) decreased from 1960 to the 1990s due to improved wastewater treatment, then began to increase in response to climate change and reduced acidic deposition. Concentrations of water constituents exhibited varying individual long-term and seasonal patterns due to the differing effects of following major processes on their production/removal in the catchment-river system: (1) applications of synthetic fertilizers, liming and farmland draining (NO 3 − , SO 4 2− , Cl − , Ca 2+ , Mg 2+ , K + , and HCO 3 − ), (2) wastewater production and treatment (DOC, P, N forms), (3) road de-icing (Cl − and Na + ), (4) atmospheric pollution (SO 4 2− ), (5) climate change (DOC), and (6) the aging of reservoirs (NH 4 + ). The water pH increased until the early 1990s, then decreased and exhibited pronounced seasonal variations, integrating the effects of changing external acidity sources and in-lake H + sources and sinks (i.e., microbial CO 2 production/consumption and availability and transformations of inorganic N), and changes in water buffering capacity. Anthropogenic and climatic effects, reservoir aging, and changes in water eutrophication thus may significantly affect water pH also in circum-neutral systems.
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Concentrations of water constituents exhibited varying individual long-term and seasonal patterns due to the differing effects of following major processes on their production/removal in the catchment-river system: (1) applications of synthetic fertilizers, liming and farmland draining (NO 3 − , SO 4 2− , Cl − , Ca 2+ , Mg 2+ , K + , and HCO 3 − ), (2) wastewater production and treatment (DOC, P, N forms), (3) road de-icing (Cl − and Na + ), (4) atmospheric pollution (SO 4 2− ), (5) climate change (DOC), and (6) the aging of reservoirs (NH 4 + ). The water pH increased until the early 1990s, then decreased and exhibited pronounced seasonal variations, integrating the effects of changing external acidity sources and in-lake H + sources and sinks (i.e., microbial CO 2 production/consumption and availability and transformations of inorganic N), and changes in water buffering capacity. 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Mean annual water temperature increased by 2.1 °C, flow maxima shifted by ~ 13 days from the early April to mid-March, and the onset of thermal stratification of water column and spring algal peaks advanced by 19 and 21 days, respectively, due to climate warming. Concentrations of major ions, phosphorus (P), and chlorophyll increased from the 1960s to the 1990–2000s, then decreased due to changing agricultural practices and legislation, intensified wastewater treatment, and decreasing atmospheric pollution. Concentrations of dissolved organic carbon (DOC) decreased from 1960 to the 1990s due to improved wastewater treatment, then began to increase in response to climate change and reduced acidic deposition. Concentrations of water constituents exhibited varying individual long-term and seasonal patterns due to the differing effects of following major processes on their production/removal in the catchment-river system: (1) applications of synthetic fertilizers, liming and farmland draining (NO 3 − , SO 4 2− , Cl − , Ca 2+ , Mg 2+ , K + , and HCO 3 − ), (2) wastewater production and treatment (DOC, P, N forms), (3) road de-icing (Cl − and Na + ), (4) atmospheric pollution (SO 4 2− ), (5) climate change (DOC), and (6) the aging of reservoirs (NH 4 + ). The water pH increased until the early 1990s, then decreased and exhibited pronounced seasonal variations, integrating the effects of changing external acidity sources and in-lake H + sources and sinks (i.e., microbial CO 2 production/consumption and availability and transformations of inorganic N), and changes in water buffering capacity. Anthropogenic and climatic effects, reservoir aging, and changes in water eutrophication thus may significantly affect water pH also in circum-neutral systems.</description><subject>Acid deposition</subject><subject>Acidity</subject><subject>Ageing</subject><subject>Aging</subject><subject>Agricultural land</subject><subject>Agricultural practices</subject><subject>Agricultural wastes</subject><subject>Agrochemicals</subject><subject>Air pollution</subject><subject>Algae</subject><subject>Anthropogenic factors</subject><subject>Biogeochemistry</subject><subject>Biogeosciences</subject><subject>Calcium</subject><subject>Calcium ions</subject><subject>Carbon dioxide</subject><subject>Catchment area</subject><subject>Chemical properties</subject><subject>Chemicophysical properties</subject><subject>Chlorophyll</subject><subject>Chlorophylls</subject><subject>Climate change</subject><subject>Climate effects</subject><subject>Deicing</subject><subject>Dissolved organic carbon</subject><subject>Drainage systems</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Ecosystems</subject><subject>Environmental Chemistry</subject><subject>Eutrophication</subject><subject>Fertilizers</subject><subject>Global warming</subject><subject>Lakes</subject><subject>Legislation</subject><subject>Life Sciences</subject><subject>Liming</subject><subject>Magnesium</subject><subject>Microorganisms</subject><subject>pH effects</subject><subject>Phosphorus</subject><subject>Pollution</subject><subject>Pollution control</subject><subject>Reservoirs</subject><subject>River catchments</subject><subject>River water</subject><subject>Rivers</subject><subject>Seasonal variation</subject><subject>Seasonal variations</subject><subject>Thermal stratification</subject><subject>Trends</subject><subject>Wastewater treatment</subject><subject>Water circulation</subject><subject>Water column</subject><subject>Water properties</subject><subject>Water stratification</subject><subject>Water temperature</subject><subject>Water treatment</subject><issn>0168-2563</issn><issn>1573-515X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp9kM1LAzEQxYMoWKv_gKeA5-gkafbjqMUvKHhR8Bam2dma0u7WZLfa_vWmreDNOczA8HuPx2PsUsK1BMhvogSjtQAlBUABILZHbCBNroWR5v2YDUBmhVAm06fsLMY5AJQ56AFb3_l2Rq37oKV3uOAO-0iRtzWP_rvbiA1h4F2gpoocm4pHwtg2CVxj8Nj5ttnDwa8p8C_s0l6FdkWh88nGNxz5AsOM-H2_e2PDpxh9c85OalxEuvi9Q_b2cP86fhKTl8fn8e1EOJ3pTmAltTOapCpMVkw1EVBZVZh2ToiyKgpUsla6lNKNsoymzpQl0gjqaqRyqYfs6uCbQn32FDs7b_uQ8kerjCq0VGkSpQ6UC22MgWq7Cn6JYWMl2F2_9tCvTf3afb92m0T6IIoJbmYU_qz_Uf0AgB6Adw</recordid><startdate>20210501</startdate><enddate>20210501</enddate><creator>Kopáček, Jiří</creator><creator>Hejzlar, Josef</creator><creator>Porcal, Petr</creator><creator>Znachor, Petr</creator><general>Springer International Publishing</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7QL</scope><scope>7SN</scope><scope>7ST</scope><scope>7T7</scope><scope>7UA</scope><scope>7X7</scope><scope>7XB</scope><scope>88A</scope><scope>88I</scope><scope>8AO</scope><scope>8FD</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>FR3</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>H96</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>L.G</scope><scope>LK8</scope><scope>M0S</scope><scope>M2P</scope><scope>M7P</scope><scope>P64</scope><scope>PATMY</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PYCSY</scope><scope>Q9U</scope><scope>SOI</scope><orcidid>https://orcid.org/0000-0002-4409-4032</orcidid></search><sort><creationdate>20210501</creationdate><title>Biogeochemical causes of sixty-year trends and seasonal variations of river water properties in a large European basin</title><author>Kopáček, Jiří ; 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Mean annual water temperature increased by 2.1 °C, flow maxima shifted by ~ 13 days from the early April to mid-March, and the onset of thermal stratification of water column and spring algal peaks advanced by 19 and 21 days, respectively, due to climate warming. Concentrations of major ions, phosphorus (P), and chlorophyll increased from the 1960s to the 1990–2000s, then decreased due to changing agricultural practices and legislation, intensified wastewater treatment, and decreasing atmospheric pollution. Concentrations of dissolved organic carbon (DOC) decreased from 1960 to the 1990s due to improved wastewater treatment, then began to increase in response to climate change and reduced acidic deposition. 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subjects Acid deposition
Acidity
Ageing
Aging
Agricultural land
Agricultural practices
Agricultural wastes
Agrochemicals
Air pollution
Algae
Anthropogenic factors
Biogeochemistry
Biogeosciences
Calcium
Calcium ions
Carbon dioxide
Catchment area
Chemical properties
Chemicophysical properties
Chlorophyll
Chlorophylls
Climate change
Climate effects
Deicing
Dissolved organic carbon
Drainage systems
Earth and Environmental Science
Earth Sciences
Ecosystems
Environmental Chemistry
Eutrophication
Fertilizers
Global warming
Lakes
Legislation
Life Sciences
Liming
Magnesium
Microorganisms
pH effects
Phosphorus
Pollution
Pollution control
Reservoirs
River catchments
River water
Rivers
Seasonal variation
Seasonal variations
Thermal stratification
Trends
Wastewater treatment
Water circulation
Water column
Water properties
Water stratification
Water temperature
Water treatment
title Biogeochemical causes of sixty-year trends and seasonal variations of river water properties in a large European basin
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