Contribution of carbonates and oxalates to the calcium cycle in three beech temperate forest ecosystems with contrasting soil calcium availability

Turpault, Marie–Pierre; Calvaruso, Christophe; Dincher, Marie; Mohammed, Gihan; Didier, Serge; Redon, Paul-Olivier; Cochet, Carine

doi:10.1007/s10533-019-00610-4

Cited by 14 publications

(6 citation statements)

References 39 publications

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“…To a lesser extent, oxides and oxyhydroxides (Fe and Mn oxides in this case) also contribute to high CEC (Schaetzl & Thompson, 2015). Finally, other transient compartments exist for Ca, that is, the vegetation and the soil organic matter (Rowley et al, 2018; with a turnover of about a few years; Dincher et al, 2020; Turpault et al, 2019). The vegetation must have been mostly woody during the African Humid Period in North Cameroon (Amaral et al, 2013; Diaz et al, 2018) and represented an effective Ca transient compartment.…”

Section: Discussionmentioning

confidence: 99%

Calcium transfer and mass balance associated with soil carbonate in a semi‐arid silicate watershed (North Cameroon): An overlooked geochemical cascade?

Dietrich

Diaz

Deschamps

et al. 2021

The Depositional Record

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Calcium is a key element of the Earth system and closely coupled to the carbon cycle. Weathering of silicate releases Ca, which is exported and sequestered in oceans. However, pedogenic calcium carbonate constitutes a second Ca‐trapping pathway that has received less attention. Large accumulations of pedogenic calcium carbonate nodules, associated with palaeo‐Vertisols, are widespread in North Cameroon, despite a carbonate‐free watershed. A previous study suggested that a significant proportion of Ca released during weathering was trapped in palaeo‐Vertisols but the pathways involved in the transfer of Ca from sources (the granite and the Saharan dust) to a temporary sink (the carbonate nodules) remain unclear. This study aims to compare the distribution of elements in carbonate nodules and their associated past and present compartments for Ca in the landscape. These compartments are all characterised by a distinctive geochemical composition, resulting from specific processes. Three end members have been defined based on geochemical data: (a) the granite and its residual products, dominated by K2O and Na2O, Ti and Zr, HREE, and a positive Ce anomaly; (b) the soil parental material and the Saharan dust, dominated by Al2O3, Fe2O3 and MgO, V, HREE, and a positive Ce anomaly; and finally (c) the carbonate nodules, which are dominated by CaO, a depletion in V, Ti and Zr, and an enrichment in REE with a negative Ce anomaly. Mass balance calculations in soil profiles demonstrated that the accumulation of Ca in carbonate nodules exceeds the Ca released by chemical weathering of the parental material, because of a continuous accumulation and contribution from lateral transfers. Consequently, at the landscape scale, carbonate nodules associated with palaeo‐Vertisols constitute a temporary sink for Ca. Such a spatial relationship between sources and transient compartments opens an avenue to the new concept of ‘geochemical cascade’, similar in terms of geochemistry, to the concept of ‘sediment cascade’ developed by continental sedimentologists.

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Section: Discussionmentioning

confidence: 99%

Calcium transfer and mass balance associated with soil carbonate in a semi‐arid silicate watershed (North Cameroon): An overlooked geochemical cascade?

Dietrich

Diaz

Deschamps

et al. 2021

The Depositional Record

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“…Oxidation of litter oxalate by soil oxalotrophic bacteria gives rise to the oxalate–carbonate pathway leading to CaCO 3 accumulation and a local soil pH increase. CaCO 3 may then accumulate, modifying soil conditions and sequestering carbon and Ca in an inorganic form with a longer residence time than organic carbon (Cailleau et al ., 2014; Turpault et al ., 2019). Further research could lead to the exploitation of this biogeochemical process as an important global regulator of soil Ca concentration (Turpault et al ., 2019) and of atmospheric CO 2 levels, mitigating the greenhouse effect (Cailleau et al ., 2011).…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

“…CaCO 3 may then accumulate, modifying soil conditions and sequestering carbon and Ca in an inorganic form with a longer residence time than organic carbon (Cailleau et al ., 2014; Turpault et al ., 2019). Further research could lead to the exploitation of this biogeochemical process as an important global regulator of soil Ca concentration (Turpault et al ., 2019) and of atmospheric CO 2 levels, mitigating the greenhouse effect (Cailleau et al ., 2011). It is clear that these possibilities will elicit further research to show how CCals play a significant role in the larger area of biomineralisation.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

New insights into the functions of carbon–calcium inclusions in plants

et al. 2020

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Carbon-calcium inclusions (CCaI) either as calcium oxalate crystals (CaOx) or amorphous calcium carbonate cystoliths are spread among most photosynthetic organisms. They represent dynamic structures with a significant construction cost and their appearance during evolution indicates an ancient origin. Both types of inclusions share some similar functional characteristics providing adaptive advantages such as the regulation of Ca levels, and the release of CO 2 and water molecules upon decomposition. The latter seems to be essential under drought conditions and explains the intense occurrence of these structures in plants thriving in dry climates. It seems, however, that for plants CaOx may represent a more prevalent storage system compared with CaCO 3 due to the multifunctionality of oxalate. This compound participates in a number of important soil biogeochemical processes, creates endosymbiosis with beneficial bacteria and provides tolerance against a combination of abiotic (nutrient deprivation, metal toxicity) and biotic (pathogens, herbivores) stress factors. We suggest a re-evaluation of the roles of these fascinating plant structures under a new and holistic approach that could enhance our understanding of carbon sequestration at the whole plant level and provide future perspectives.

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“…The coupling between carbon and calcium cycles is well described in the hydro-atmosphere system [ 8 ]. However, these two elements are also intimately linked in terrestrial ecosystems, including forest soils [ 9 , 10 , 11 ], and microorganisms contribute to various processes and steps of these cycles [ 12 , 13 , 14 , 15 ]. This is, for instance, the case in the oxalate-carbonate pathway (OCP).…”

Section: Introductionmentioning

confidence: 99%

Functional Diversity of the Litter-Associated Fungi from an Oxalate-Carbonate Pathway Ecosystem in Madagascar

et al. 2021

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The oxalate–carbonate pathway (OCP) is a biogeochemical process linking oxalate oxidation and carbonate precipitation. Currently, this pathway is described as a tripartite association involving oxalogenic plants, oxalogenic fungi, and oxalotrophic bacteria. While the OCP has recently received increasing interest given its potential for capturing carbon in soils, there are still many unknowns, especially regarding the taxonomic and functional diversity of the fungi involved in this pathway. To fill this gap, we described an active OCP site in Madagascar, under the influence of the oxalogenic tree Tamarindus indica, and isolated, identified, and characterized 50 fungal strains from the leaf litter. The fungal diversity encompassed three phyla, namely Mucoromycota, Ascomycota, and Basidiomycota, and 23 genera. Using various media, we further investigated their functional potential. Most of the fungal strains produced siderophores and presented proteolytic activities. The majority were also able to decompose cellulose and xylan, but only a few were able to solubilize inorganic phosphate. Regarding oxalate metabolism, several strains were able to produce calcium oxalate crystals while others decomposed calcium oxalate. These results challenge the current view of the OCP by indicating that fungi are both oxalate producers and degraders. Moreover, they strengthen the importance of the role of fungi in C, N, Ca, and Fe cycles.

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Contribution of carbonates and oxalates to the calcium cycle in three beech temperate forest ecosystems with contrasting soil calcium availability

Cited by 14 publications

References 39 publications

Calcium transfer and mass balance associated with soil carbonate in a semi‐arid silicate watershed (North Cameroon): An overlooked geochemical cascade?

Calcium transfer and mass balance associated with soil carbonate in a semi‐arid silicate watershed (North Cameroon): An overlooked geochemical cascade?

New insights into the functions of carbon–calcium inclusions in plants

Functional Diversity of the Litter-Associated Fungi from an Oxalate-Carbonate Pathway Ecosystem in Madagascar

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