Assessing the origin of carbonates in a complex soil with a suite of analytical methods

Catoni, Marcella; Falsone, Gloria; Bonifacio, Eleonora

doi:10.1016/j.geoderma.2012.01.022

Cited by 21 publications

(8 citation statements)

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“…Moreover, the 332 relatively higher C/N ratio observed for MOM in spring (C/N = 12.2, Table 2) in PG is in 333 agreement with a contribution of relatively fresh organic compounds from the previous year, while 334 the decreasing trend with time (C/N = 9.2 and 8.4 in summer and autumn respectively, Table 2) 335 suggests that even this relatively stable fraction undergoes some annual turnover (Hooker and Stark 336 2012). It is worthy to note that in calcareous soils, even when carbonates are lithogenic and 337 therefore do not play an important role in aggregate stabilization by grain coating and pore clogging 338 (Catoni et al 2012), calcium cations may contribute to the binding of particulate organic matter on 339 minerals through weak chemical bonds, that may have nonetheless resisted disruption at the 340 relatively low sonication energy applied (Cerli et al 2012). We thus hypothesised that in the PG 341 treatment a fraction of partly degraded SOM might be bound to clay particles through Ca 2+ bridges, 342 resulting in relatively labile associations not able to preserve OM from degradation (Mikutta et al 343 2007).…”

Section: Discussion 257mentioning

confidence: 99%

Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil

et al. 2016

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This is the author's final version of the contribution published as:Belmonte, Sergio A; Celi, Luisella; Stanchi, Silvia; Said-Pullicino, Daniel; Zanini, Ermanno; Bonifacio, Eleonora. Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil. SOIL RESEARCH. 54 (7) AbstractVineyard soils are typically characterised by poor development, low organic matter content, steep slopes, and consequently a limited capacity of conservation of the organic matter which is weakly bound to the mineral soil phase. In such conditions, permanent grass may help the conservation of the soil quality. The aim of this work was to evaluate the effects of permanent grass vs. single autumn tillage on soil structure and organic matter dynamics in a hilly vineyard. In the periods 1994-1996 and 2010-2012 soil samples were collected three times per year, in different seasons. Aggregate stability analyses and organic matter fractionation were performed. The effects of grass cover on soil recovery capacity after tillage disturbance were slow. Slight increases in aggregate resistance and organic matter contents were visible after three years, and only after long-lasting permanent grass the two plots (permanent grass/previously tilled) showed great decrease of aggregate losses and increase of organic matter. Even a single tillage produced however an immediate decrease in aggregate resistance, while the amounts of organic matter remained unaffected. Organic matter, however, showed marked seasonal dynamics, which involved not only recently added organic matter fractions but also the mineral-associated pool. Tillage altered organic matter dynamics by preventing the addition of new material into the mineral-associated organic fractions and limiting the stabilization of aggregates.

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Section: Discussion 257mentioning

confidence: 99%

Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil

et al. 2016

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“…The origin and time-integration of geogenic carbonate isotopic compositions may be more difficult to ascertain. Geogenic carbonates found in paleosol-loess sequences may record formation temperatures of minerals in the deflation area from which dust was sourced, where the minerals may have been formed through a variety of geological processes, including metamorphism (Catoni et al, 2012; Baez-Hernandez et al, 2019). Therefore, various carbonate types—even located in the same stratigraphic level in a paleosol-loess sequence—may record a mixture, but specific and potentially complementary environmental information based on differences in δ 13 C, δ 18 O, and Δ 47 values.…”

Section: Introductionmentioning

confidence: 99%

The δ¹³C, δ¹⁸O and Δ₄₇records in biogenic, pedogenic and geogenic carbonate types from paleosol-loess sequence and their paleoenvironmental meaning

et al. 2021

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Paleoenvironmental reconstructions are commonly based on isotopic signatures of a variety of carbonate types, including rhizoliths and land-snail shells, present in paleosol-loess sequences. However, various carbonate types are formed through distinct biotic and abiotic processes over various periods, and therefore may record diverging environmental information in the same sedimentological layer. Here, we investigate the effects of carbonate type on δ13C, δ18O, and clumped isotope-derived paleotemperature [T(Δ47)] from the Quaternary Nussloch paleosol-loess sequence (Rhine Valley, SW Germany). δ13C, δ18O, and T(Δ47) values of co-occurring rhizoliths (-8.2‰ to -5.8‰, -6.1‰ to -5.9‰, 12–32°C, respectively), loess dolls (-7.0‰, -5.6‰, 23°C), land-snail shells (-8.1‰ to -3.2‰, -4.0‰ to -2.2‰, 12–38°C), earthworm biospheroliths (-11‰, -4.7‰, 8°C), and “bulk” carbonates (-1.9‰ to -0.5‰, -5.6‰ to -5.3‰, 78–120°C) from three sediment layers depend systematically on the carbonate type, admixture from geogenic carbonate, and the duration of formation periods. Based on these findings, we provide a comprehensive summary for the application of the three isotopic proxies of δ13C, δ18O, and Δ47 in biogenic and pedogenic carbonates present in the same sediment layer to reconstruct paleoenvironments (e.g., local vegetation, evaporative conditions, and temperature). We conclude that bulk carbonates in Nussloch loess should be excluded from paleoenvironmental reconstructions. Instead, pedogenic and biogenic carbonates should be used to provide context for interpreting the isotopic signature for detailed site- and time-specific paleoenvironmental information.

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“…Most authors relate the 12 С/ 13 С ratio in the soil OM with the portions of C3 and C4 plants in the ecosys tems [23,25]. The plant communities in the temperate climatic conditions, including the boundary between the forest and steppe zones, consist of C3 plants, and C4 plants are grasses and herbs predominantly grow ing under tropical and subtropical climates [39].…”

Section: Resultsmentioning

confidence: 99%

“…(2) The admixure of lithogenic carbonates, which have a significantly heavier CIC [25]: this is also improbable because of the absence of lithogenic car bonate inclusions in the study section (carbonate crusts, fragment inclusions, etc.). In addition, the XRD analysis of the coating layers showed that they are composed of pure calcite without dolomite or other carbonate minerals.…”

Section: Resultsmentioning

confidence: 99%

Stable carbon and oxygen isotopes in pedogenic carbonate coatings of chernozems in the Southern Cis-Baikalia as indicators of local environmental changes

et al. 2014

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Carbonate coatings formed on the lower surfaces of pebble inclusions in the Holocene-Late Pleistocene sediments on the Irkutsk-Cheremkhovo Plain have been studied. The coupled analysis of the carbon isotope composition of the soil organic matter and carbonate coatings has indicated the formation of coatings under conditions of phytocenoses with the predominance of C3 plants. A significant effect of the atmospheric CO 2 on the carbon isotope composition in the coatings has been noted, which could be related to their formation under low soil respiration rates. The latter was apparently due to the periodic freezing of the soil, which affected the structure of the coatings and was most manifested in the formation of spherulites in their outer layers. The carbonate coatings consist of two laminae significantly differing in their structure and stable isotope composition, which allows separating two main stages of their formation. The lightening of the carbon isotope composition in the outer (younger) layers of the coatings compared to their inner (older) ones coincides with the increase of the δ 18 O values, which points to changes of the environmental conditions in the studied area during the formation of the coatings.

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Assessing the origin of carbonates in a complex soil with a suite of analytical methods

Cited by 21 publications

References 30 publications

Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil

Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil

The δ¹³C, δ¹⁸O and Δ₄₇records in biogenic, pedogenic and geogenic carbonate types from paleosol-loess sequence and their paleoenvironmental meaning

Stable carbon and oxygen isotopes in pedogenic carbonate coatings of chernozems in the Southern Cis-Baikalia as indicators of local environmental changes

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Assessing the origin of carbonates in a complex soil with a suite of analytical methods

Cited by 21 publications

References 30 publications

Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil

Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil

The δ13C, δ18O and Δ47records in biogenic, pedogenic and geogenic carbonate types from paleosol-loess sequence and their paleoenvironmental meaning

Stable carbon and oxygen isotopes in pedogenic carbonate coatings of chernozems in the Southern Cis-Baikalia as indicators of local environmental changes

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The δ¹³C, δ¹⁸O and Δ₄₇records in biogenic, pedogenic and geogenic carbonate types from paleosol-loess sequence and their paleoenvironmental meaning