期刊
BIOGEOCHEMISTRY
卷 137, 期 1-2, 页码 197-217出版社
SPRINGER
DOI: 10.1007/s10533-017-0411-0
关键词
Beech tree; Ca isotopes; Ca-oxalate crystals; Ca-soluble; Ca-structurally bound; FTIR
资金
- French CNRS-INSU programme EC2CO-Cytrix''
- ANPCyT - Argentine [PICT 1583]
- Mar del Plata University - Argentine [EXA 741/2015]
In this study, we linked Ca speciation with isotope composition in plants. To do this, we performed leachate experiments to access the soluble Ca, structurally bound Ca and insoluble Ca (i.e., water and weak acid resistant) within beech tree organs (Fagus sylvatica L.). Ca isotopic measurements were combined with infrared spectroscopy and calcium oxalate biomineralization identification. The results from our study indicate that bark and leaves are the most enriched in monohydrated calcium oxalate crystals (whewellite), which are observable in parenchyma and sclerenchyma tissues, whereas roots and wood are enriched in structurally bound Ca. Our leaching experiments also show decreasing delta Ca-44/40 isotopic signatures in the order of soluble Ca > structurally bound Ca > insoluble Ca. This finding implies that because leaves degrade faster than wooden organs and because Ca linked to pectate decomposes faster than Ca linked to oxalate crystals, differential Ca isotopic signatures are expected to be observed during litter degradation.
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