Magnesium and calcium isotope systematics in a headwater catchment underlain by amphibolite: Constraints on Mg–Ca biogeochemistry in an atmospherically polluted but well-buffered spruce ecosystem (Czech Republic, Central Europe)
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000048" target="_blank" >RIV/00025798:_____/20:00000048 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0341816220301879" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0341816220301879</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.catena.2020.104637" target="_blank" >10.1016/j.catena.2020.104637</a>
Alternative languages
Result language
angličtina
Original language name
Magnesium and calcium isotope systematics in a headwater catchment underlain by amphibolite: Constraints on Mg–Ca biogeochemistry in an atmospherically polluted but well-buffered spruce ecosystem (Czech Republic, Central Europe)
Original language description
Lithogenic and biologically-fractionated magnesium (Mg) and calcium (Ca) are viewed as alternative controls of the 26Mg and 44Ca isotope signatures of streams and rivers. Understanding of Mg–Ca isotope systematics and of runoff generation in headwater catchments is crucial for upscaling riverine variability in 26Mg and 44Ca values to Mg–Ca isotope inputs into the oceans, and for global climate change considerations. Here we report Mg–Ca–Sr isotope systematics in a small, spruce-forested, high-elevation catchment in western Czech Republic, which has received high Mg and Ca inputs from dissolution of base-rich bedrock amphibolite and from industrial emissions. Our study site NAZ (Slavkov Forest) experienced a relatively long period of acid rain (ca. 1950-1995), accompanied by deposition of partly soluble dust from coal-burning power plants. Bedrock contained as much as 11 and 10 wt. percent of MgO and CaO, respectively. Input–output monitoring revealed a large net export of Mg, Ca, but also S, from the catchment via surface runoff. The 26Mg values increased in the order: open-area precipitation (-1.44 per mille) < soil water (-1.10 per mille) < spruce canopy throughfall (-1.00 per mille) < runoff (-0.96 per mille) < spruce bark (-0.59 per mille) < spruce needles (-0.46 per mille) < spruce xylem (-0.40 per mille) < bedrock (-0.32 per mille) < soil (-0.30 per mille) < spruce fine roots (-0.07 per mille). The 44Ca values increased in the order: spruce bark (-1.91 per mille) < spruce xylem (-0.86 per mille) < spruce fine roots (-0.83 per mille) < spruce needles (-0.43 per mille) < spruce canopy throughfall (0.31 per mille) < soil water (0.44 per mille) < soil (0.46 per mille) < open-area precipitation (0.69 per mille) < plagioclase (0.83 per mille) < bulk bedrock (0.86 per mille) < runoff (0.92 per mille) < amphibole (1.10 per mille). Our data indicated a relatively small Mg isotope fractionation toward higher 26Mg values in organic matter, and a large Ca isotope fractionation toward lower 44Ca values in all studied organic compartments. In contrast to Mg, most Ca isotope variability at NAZ was driven by biological fractionations. While excess Mg and Ca in NAZ export fluxes via catchment runoff are most easily explained by lithological control of runoff Mg–Ca, the Mg–Ca–Sr isotope systematics were also consistent with measurable atmospheric contribution to Mg and Ca in runoff.
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
<a href="/en/project/GA18-15498S" target="_blank" >GA18-15498S: Calcium and magnesium isotope mass balances in acidified small catchments with contrasting lithologies</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Catena
ISSN
0341-8162
e-ISSN
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Volume of the periodical
193
Issue of the periodical within the volume
October : 104637
Country of publishing house
DE - GERMANY
Number of pages
16
Pages from-to
nestránkováno
UT code for WoS article
000538770800031
EID of the result in the Scopus database
2-s2.0-85084677445