Time-series of δ26Mg values in a headwater catchment reveal decreasing magnesium isotope variability from precipitation to runoff
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000145" target="_blank" >RIV/00025798:_____/21:00000145 - isvavai.cz</a>
Result on the web
<a href="https://onlinelibrary.wiley.com/doi/10.1002/hyp.14116" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/hyp.14116</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/hyp.14116" target="_blank" >10.1002/hyp.14116</a>
Alternative languages
Result language
angličtina
Original language name
Time-series of δ26Mg values in a headwater catchment reveal decreasing magnesium isotope variability from precipitation to runoff
Original language description
Data on temporal variability in Mg isotope ratios of atmospheric deposition and runoff are critical for decreasing the uncertainty associated with construction of isotope mass balances in headwater catchments, and statistical evaluation of isotope differences among Mg pools and fluxes. Such evaluations, in turn, are needed to distinguish between biotic and abiotic contributions to Mg2+ in catchment runoff. We report the first annual time-series of delta26Mg values simultaneously determined for rainfall, canopy throughfall, soil water and runoff. The studied 55-ha catchment, situated in western Czech Republic, is underlain by Mg-rich amphibolite and covered by mature spruce stands. Between 1970 and 1996, the site received extremely high amounts of acid deposition and fly ash form nearby coal-burning power plants. The delta26Mg values of open-area precipitation (median of -0.79per mille) at our study site were statistically indistinguishable from the delta26Mg values of throughfall (-0.73per mille), but significantly different from the delta26Mg values of soil water (-0.55per mille) and runoff (-0.55per mille). The range of delta26Mg values during the observation period decreased in the order: open-area precipitation (0.57per mille) >; throughfall (0.27per mille) >; runoff (0.21per mille) >; soil water (0.16per mille). The decreasing variability in delta26Mg values of Mg2+ from precipitation to soil water and runoff reflected an increasing homogenization of atmospheric Mg in the catchment and its mixing with geogenic Mg. In addition to atmospheric Mg, runoff also contained Mg mobilized from the three major solid Mg pools, bedrock (delta26Mg of -0.32per mille), soil (-0.28per mille), and vegetation (-0.31per mille). The drought of summer 2019 did not affect the nearly constant delta26Mg value of runoff. Collectively, our data show that withincatchment processes buffer the Mg isotope variability of the atmospheric input.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Hydrological Processes
ISSN
0885-6087
e-ISSN
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Volume of the periodical
35
Issue of the periodical within the volume
4 : e14116
Country of publishing house
GB - UNITED KINGDOM
Number of pages
10
Pages from-to
nestránkováno
UT code for WoS article
000645220700012
EID of the result in the Scopus database
2-s2.0-85104999779