Calcium isotope constraints on the uptake and sources of Ca2+ in a base-poor forest: A new concept of combining stable (d44/42Ca) and radiogenic (eCa) signals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F11%3A00000370" target="_blank" >RIV/00025798:_____/11:00000370 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.gca.2011.09.021" target="_blank" >http://dx.doi.org/10.1016/j.gca.2011.09.021</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gca.2011.09.021" target="_blank" >10.1016/j.gca.2011.09.021</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Calcium isotope constraints on the uptake and sources of Ca2+ in a base-poor forest: A new concept of combining stable (d44/42Ca) and radiogenic (eCa) signals

Popis výsledku v původním jazyce

This study shows that in a base-poor forest of the northeastern USA the ?exchangeable Ca pool? of deeper mineral soils is significantly enriched in radiogenic 40Ca, due to the dissolution of K-rich silicate minerals. Using a simple isotope mass balance model our results indicate that the weathering of biotite may supply a sizeable fraction, up to 25%, of Ca into the ?exchangeable pool? of deeper mineral soils. We also found no evidence of radiogenic 40Ca in the samples of forest floor and the uppermostorganic-rich soils, which in turn suggest that over the long-term development of the forest, the vegetation growth must relied primarily on the non-radiogenic Ca sources, such as (i) atmospheric deposition, (ii) organically-complexed Ca, and (iii) chemical weathering and/or fungal mediated dissolution of apatite. Hence, our Ca isotope data indicate that the base-poor forest is able to bypass the ?exchangeable pool? of deeper mineral soils, and still manages to meet its nutritional Ca req

Název v anglickém jazyce

Calcium isotope constraints on the uptake and sources of Ca2+ in a base-poor forest: A new concept of combining stable (d44/42Ca) and radiogenic (eCa) signals

Popis výsledku anglicky

This study shows that in a base-poor forest of the northeastern USA the ?exchangeable Ca pool? of deeper mineral soils is significantly enriched in radiogenic 40Ca, due to the dissolution of K-rich silicate minerals. Using a simple isotope mass balance model our results indicate that the weathering of biotite may supply a sizeable fraction, up to 25%, of Ca into the ?exchangeable pool? of deeper mineral soils. We also found no evidence of radiogenic 40Ca in the samples of forest floor and the uppermostorganic-rich soils, which in turn suggest that over the long-term development of the forest, the vegetation growth must relied primarily on the non-radiogenic Ca sources, such as (i) atmospheric deposition, (ii) organically-complexed Ca, and (iii) chemical weathering and/or fungal mediated dissolution of apatite. Hence, our Ca isotope data indicate that the base-poor forest is able to bypass the ?exchangeable pool? of deeper mineral soils, and still manages to meet its nutritional Ca req

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DD - Geochemie

OECD FORD obor

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Projekt

—

Návaznosti

R - Projekt Ramcoveho programu EK

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geochimica et Cosmochimica Acta

ISSN

0016-7037

e-ISSN

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Svazek periodika

75

Číslo periodika v rámci svazku

22

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

16

Strana od-do

7031-7046

Kód UT WoS článku

000296579600019

EID výsledku v databázi Scopus

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