Controls on δ26Mg variability in three Central European headwater catchments characterized by contrasting bedrock chemistry and contrasting inputs of atmospheric pollutants.
Magnesium isotope ratios (26Mg/24Mg) can provide insights into the origin of Mg pools and fluxes in catchments where Mg sources have distinct isotope compositions, and the direction and magnitude of Mg isotope fractionations are known. Variability in Mg isotope compositions was investigated in three...
Main Authors: | , , , , , , , , , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Public Library of Science (PLoS)
2020-01-01
|
Series: | PLoS ONE |
Online Access: | https://doi.org/10.1371/journal.pone.0242915 |
id |
doaj-143294dbee544d2083ca14584b16a8ad |
---|---|
record_format |
Article |
spelling |
doaj-143294dbee544d2083ca14584b16a8ad2021-03-04T12:29:21ZengPublic Library of Science (PLoS)PLoS ONE1932-62032020-01-011511e024291510.1371/journal.pone.0242915Controls on δ26Mg variability in three Central European headwater catchments characterized by contrasting bedrock chemistry and contrasting inputs of atmospheric pollutants.Martin NovakJuraj FarkasPavel KramJakub HruskaMarketa StepanovaFrantisek VeselovskyJan CurikAlexandre V AndronikovOndrej SebekMartin SimecekDaniela FottovaLeona BohdalkovaEva PrechovaMagdalena KoubovaHyacinta VitkovaMagnesium isotope ratios (26Mg/24Mg) can provide insights into the origin of Mg pools and fluxes in catchments where Mg sources have distinct isotope compositions, and the direction and magnitude of Mg isotope fractionations are known. Variability in Mg isotope compositions was investigated in three small, spruce-forested catchments in the Czech Republic (Central Europe) situated along an industrial pollution gradient. The following combinations of catchment characteristics were selected for the study: low-Mg bedrock + low Mg deposition (site LYS, underlain by leucogranite); high-Mg bedrock + low Mg deposition (site PLB, underlain by serpentinite), and low-Mg bedrock + high Mg deposition (site UDL, underlain by orthogneiss). UDL, affected by spruce die-back due to acid rain, was the only investigated site where dolomite was applied to mitigate forest decline. The δ26Mg values of 10 catchment compartments were determined on pooled subsamples. At LYS, a wide range of δ26Mg values was observed across the compartments, from -3.38 ‰ (bedrock) to -2.88 ‰ (soil), -1.48% (open-area precipitation), -1.34 ‰ (throughfall), -1.19 ‰ (soil water), -0.99 ‰ (xylem), -0.95 ‰ (needles), -0.82 ‰ (bark), -0.76 ‰ (fine roots), and -0.76 ‰ (runoff). The δ26Mg values at UDL spanned 1.32 ‰ and were thus less variable, compared to LYS. Magnesium at PLB was isotopically relatively homogeneous. The δ26Mg systematics was consistent with geogenic control of runoff Mg at PLB. Mainly atmospheric/biological control of runoff Mg was indicated at UDL, and possibly also at LYS. Our sites did not exhibit the combination of low-δ26Mg runoff and high-δ26Mg weathering products (secondary clay minerals) reported from several previously studied sites. Six years after the end of liming at UDL, Mg derived from dolomite was isotopically undetectable in runoff.https://doi.org/10.1371/journal.pone.0242915 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Martin Novak Juraj Farkas Pavel Kram Jakub Hruska Marketa Stepanova Frantisek Veselovsky Jan Curik Alexandre V Andronikov Ondrej Sebek Martin Simecek Daniela Fottova Leona Bohdalkova Eva Prechova Magdalena Koubova Hyacinta Vitkova |
spellingShingle |
Martin Novak Juraj Farkas Pavel Kram Jakub Hruska Marketa Stepanova Frantisek Veselovsky Jan Curik Alexandre V Andronikov Ondrej Sebek Martin Simecek Daniela Fottova Leona Bohdalkova Eva Prechova Magdalena Koubova Hyacinta Vitkova Controls on δ26Mg variability in three Central European headwater catchments characterized by contrasting bedrock chemistry and contrasting inputs of atmospheric pollutants. PLoS ONE |
author_facet |
Martin Novak Juraj Farkas Pavel Kram Jakub Hruska Marketa Stepanova Frantisek Veselovsky Jan Curik Alexandre V Andronikov Ondrej Sebek Martin Simecek Daniela Fottova Leona Bohdalkova Eva Prechova Magdalena Koubova Hyacinta Vitkova |
author_sort |
Martin Novak |
title |
Controls on δ26Mg variability in three Central European headwater catchments characterized by contrasting bedrock chemistry and contrasting inputs of atmospheric pollutants. |
title_short |
Controls on δ26Mg variability in three Central European headwater catchments characterized by contrasting bedrock chemistry and contrasting inputs of atmospheric pollutants. |
title_full |
Controls on δ26Mg variability in three Central European headwater catchments characterized by contrasting bedrock chemistry and contrasting inputs of atmospheric pollutants. |
title_fullStr |
Controls on δ26Mg variability in three Central European headwater catchments characterized by contrasting bedrock chemistry and contrasting inputs of atmospheric pollutants. |
title_full_unstemmed |
Controls on δ26Mg variability in three Central European headwater catchments characterized by contrasting bedrock chemistry and contrasting inputs of atmospheric pollutants. |
title_sort |
controls on δ26mg variability in three central european headwater catchments characterized by contrasting bedrock chemistry and contrasting inputs of atmospheric pollutants. |
publisher |
Public Library of Science (PLoS) |
series |
PLoS ONE |
issn |
1932-6203 |
publishDate |
2020-01-01 |
description |
Magnesium isotope ratios (26Mg/24Mg) can provide insights into the origin of Mg pools and fluxes in catchments where Mg sources have distinct isotope compositions, and the direction and magnitude of Mg isotope fractionations are known. Variability in Mg isotope compositions was investigated in three small, spruce-forested catchments in the Czech Republic (Central Europe) situated along an industrial pollution gradient. The following combinations of catchment characteristics were selected for the study: low-Mg bedrock + low Mg deposition (site LYS, underlain by leucogranite); high-Mg bedrock + low Mg deposition (site PLB, underlain by serpentinite), and low-Mg bedrock + high Mg deposition (site UDL, underlain by orthogneiss). UDL, affected by spruce die-back due to acid rain, was the only investigated site where dolomite was applied to mitigate forest decline. The δ26Mg values of 10 catchment compartments were determined on pooled subsamples. At LYS, a wide range of δ26Mg values was observed across the compartments, from -3.38 ‰ (bedrock) to -2.88 ‰ (soil), -1.48% (open-area precipitation), -1.34 ‰ (throughfall), -1.19 ‰ (soil water), -0.99 ‰ (xylem), -0.95 ‰ (needles), -0.82 ‰ (bark), -0.76 ‰ (fine roots), and -0.76 ‰ (runoff). The δ26Mg values at UDL spanned 1.32 ‰ and were thus less variable, compared to LYS. Magnesium at PLB was isotopically relatively homogeneous. The δ26Mg systematics was consistent with geogenic control of runoff Mg at PLB. Mainly atmospheric/biological control of runoff Mg was indicated at UDL, and possibly also at LYS. Our sites did not exhibit the combination of low-δ26Mg runoff and high-δ26Mg weathering products (secondary clay minerals) reported from several previously studied sites. Six years after the end of liming at UDL, Mg derived from dolomite was isotopically undetectable in runoff. |
url |
https://doi.org/10.1371/journal.pone.0242915 |
work_keys_str_mv |
AT martinnovak controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT jurajfarkas controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT pavelkram controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT jakubhruska controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT marketastepanova controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT frantisekveselovsky controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT jancurik controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT alexandrevandronikov controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT ondrejsebek controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT martinsimecek controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT danielafottova controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT leonabohdalkova controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT evaprechova controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT magdalenakoubova controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants AT hyacintavitkova controlsond26mgvariabilityinthreecentraleuropeanheadwatercatchmentscharacterizedbycontrastingbedrockchemistryandcontrastinginputsofatmosphericpollutants |
_version_ |
1714802466491465728 |