Controls on δ26Mg variability in three Central European headwater catchments characterized by contrasting bedrock chemistry and contrasting inputs of atmospheric pollutants.
Acid Rain
Calcium Carbonate
/ chemistry
Czech Republic
/ epidemiology
Environmental Monitoring
Environmental Pollution
/ prevention & control
Europe
Humans
Isotopes
/ chemistry
Magnesium
/ chemistry
Soil
/ chemistry
Soil Pollutants
/ chemistry
Trees
/ chemistry
Water Pollutants, Chemical
/ chemistry
Journal
PloS one
ISSN: 1932-6203
Titre abrégé: PLoS One
Pays: United States
ID NLM: 101285081
Informations de publication
Date de publication:
2020
2020
Historique:
received:
02
04
2020
accepted:
11
11
2020
entrez:
30
11
2020
pubmed:
1
12
2020
medline:
6
1
2021
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 33253305
doi: 10.1371/journal.pone.0242915
pii: PONE-D-20-09427
pmc: PMC7703950
doi:
Substances chimiques
Acid Rain
0
Isotopes
0
Soil
0
Soil Pollutants
0
Water Pollutants, Chemical
0
Calcium Carbonate
H0G9379FGK
Magnesium
I38ZP9992A
calcium magnesium carbonate
UG9H2002BF
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e0242915Déclaration de conflit d'intérêts
The authors have declared that no competing interests exist.
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