Geochemistry of a soil catena developed from loess deposits in a semiarid environment, Sierra Chica de Córdoba, central Argentina

Pasquini, Andrea I.; Campodonico, Verena Agustina; Rouzaut, Sabrina; Giampaoli, Viviana

doi:10.1016/j.geoderma.2017.01.033

Cited by 26 publications

(25 citation statements)

References 42 publications

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“…Soil C and nutrient could be directly affected by fires (Certini, 2005), but they also may be indirectly influenced by soil erosion (i.e., soil erosion causes C and nutri- probably caused by high soil erosion periods shortly after fires (Wittenberg & Inbar, 2009). It is possible that soil loss in HF was not followed by an abrupt decrease in soil C and nutrients because the sampled soil still belongs to the A-horizon (Pasquini et al, 2017). Accordingly, in an experiment carried out by some authors of this work in a nearby area affected by a fire in 2011, soil erosion (0.2-to 0.4-cm soil loss) was observed in the first 5 months after the fire (Zeballos et al unpublished data).…”

Section: Discussionmentioning

confidence: 99%

A 55‐year‐old natural experiment gives evidence of the effects of changes in fire frequency on ecosystem properties in a seasonal subtropical dry forest

et al. 2018

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Fire frequency has been highlighted as an important component of fire effects on ecosystems; nevertheless, there is scarce information about how fire modulates changes in ecosystem properties, particularly for subtropical dry forests. A long‐term natural experiment and a multiscale approach were used to analyze changes in ecosystem properties in a subtropical dry forest subjected to contrasting fire regimes. Measurements were taken in two adjacent sites that had contrasting fire regimes (low/high fire frequency), and vegetation and soil analyses were combined with dendrochronological methods. Ten plots (20 × 20 m) were established in each site and soil (depth, chemical, and biological properties), and vegetation (species composition and growth of the dominant tree, Lithraea molleoides) variables were measured. Fire scars in L. molleoides were useful in determining fire history. Shrubs and grasses were more abundant in the high fire frequency site, with a high cover of the exotic grass Melinis repens, whereas trees and vines were more abundant in the low fire frequency site. Soil of the high fire frequency site tended to have lower C and nutrient content as well a significant lower depth than those of the low fire frequency site. Growth of L. molleoides individuals was lower in the high fire frequency site. Our results suggest that the long‐term effects of high fire frequency probably increase both soil loss and fire frequency in the future due to changes in plant composition, indicating that frequent burning is not a sustainable management option for this seasonal subtropical dry forest.

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Section: Discussionmentioning

confidence: 99%

A 55‐year‐old natural experiment gives evidence of the effects of changes in fire frequency on ecosystem properties in a seasonal subtropical dry forest

et al. 2018

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“…7 Bivariate plot of Zr/V vs. Th/V in studied soils and materials/soils derived from quartzites, greywackes and cataclasites (Munroe et al 2007;Ujvari et al 2008;Ahmed and Chandra 2013) accumulation of materials transported from the upper soil horizons to lower, enriched horizons (Bw and Bt). Clay illuviation is noticeable in a diagnostic (argic) horizon (Pasquini et al 2017). Due to the properties of aeolian silt, its admixture as an allochthonous material in a mountain ecosystem supports the processes of pedogenesis (Lin and Feng 2015).…”

Section: Soil Formation In a Mountainous Area With An Aeolian Silt Inmentioning

confidence: 95%

“…The weathering of bedrock has long been considered to be the only, and most crucial, source of material for soil formation in mountainous environments (Romashkevich 1979;Wang et al 1997;Hahm et al 2014;Lin and Feng 2015;Kroyan 2017;Mazurek et al 2018). However, in recent years, attention has been paid to the impact of aeolian silt on mountainous soils, and there is an awareness of the fact that aeolian silts have often been covered by/ involved in slope deposits (Kufmann 2003;Schaetzl and Luehmann 2013;Feng et al 2014;Martignier et al 2015;Pasquini et al 2017;Gild et al 2018;Waroszewski et al 2018aWaroszewski et al , b, 2019. An aeolian silt contribution to a soil may occur during pedogenesis; therefore, it can enhance or weaken the soil-forming processes, or provide the initial parent material for soil formation.…”

Section: Introductionmentioning

confidence: 99%

In situ weathering of rocks or aeolian silt deposition: key parameters for verifying parent material and pedogenesis in the Opawskie Mountains—a case study from SW Poland

et al. 2019

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Purpose The aims: (1) to investigate the role of the in situ weathering of bedrock in providing substrate for soil formation; (2) to evaluate the aeolian contribution to the mountainous soils in the vicinity of thick loess cover; and (3) to determine the influence of aeolian silt on further soil development. Materials and methods The sampled sites were arranged along the slope toposequence, where an aeolian/silt admixture possibly occurred. Each soil catena started at the top of a hill and ended at its foot. Such an arrangement of the soil profiles ensured the tracking of loess thickness variations and detection of the depth of the residuum-derived materials. One reference soil profile, consisting of aeolian silt deposits, was made. The following soil properties were determined: pH, organic carbon content, soil texture, exchangeable acidity, exchangeable ions and geochemistry. In addition, thin sections were prepared from rock samples to confirm the type of bedrock present. Results and discussion The soils in the studied area were classified as Cambisols, Luvisols and Stagnosols, characterised by silt loam texture and a high content of elements indicating an aeolian silt contribution-Hf (7.4 to 14.8 ppm) and Zr (274.4 to 549.0 ppm). These values differ strongly from the residues typical of weathered quartzite, greywacke or catalasite substrates, which generally have low concentrations of Hf and Zr (0.7 to 7.0 ppm and 26.0 to 263 ppm, respectively). Based on the morphological, textural and geochemical data of the studied soils, three layers were distinguished, which show different inputs of aeolian silt: (1) an aeolian silt mantle; (2) a mixed zone in which loess was incorporated into the local material; and (3) a basal zone, free of the influence of aeolian silt. Based on the obtained results, a hypothetical pathway for soil formation in mountainous areas, influenced by aeolian silt admixing, was proposed. Conclusions Our study demonstrates that the soils developed in the Opawskie Mountains are characterised by an aeolian silt influence. This differentiates them from weakly developed soils, which comprise materials formed during in situ weathering only. Materials originating from bedrock weathering did not play an independent role as the parent material for the studied pedons. Aeolian silt was admixed with already existing autochthonous substrates, or completely replaced them. This influence on the soil formation resulted in the occurrence of Luvisols, Stagnosols and Cambisols. Such soils cannot be formed from the weathering of quartzites and greywackes, which contribute to a less structure-forming medium.

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“…Esto refleja la inmadurez de los sedimentos como consecuencia de la cercanía del área de aporte. A modo de comparación, se incluyen en la gráfica sedimentos del lago San Roque (Bertolino et al, 2007), sedimentos del río Los Reartes de áreas prístinas de las Sierras de Córdoba (Pasquini et al, 2004) y un promedio composicional del loess del piedemonte de las Sierras de Córdoba (Pasquini et al, 2017). Como se observa en la Figura 2, los sedimentos del lago y el loess se clasifican como lutitas, mientras que los sedimentos del río Los Reartes corresponden a grauvacas.…”

Section: Caracterización Geoquímica De Los Sedimentosunclassified

“…Con el fin de analizar su distribución y variabilidad geoquímica a lo largo del curso medio del río Suquía, las concentraciones absolutas fueron normalizadas al valor promedio de la CCS y se representaron mediante diagramas multielementales. La Figura 3 exhibe los resultados obtenidos, donde se incluye además un promedio composicional para muestras de loess (Pasquini et al, 2017) y la composición normalizada de sedimentos de fondo de ríos de regiones prístinas de las Sierras de Córdoba (Pasquini et al, 2004). En esta figura se observa que la composición de los sedimentos del río Suquía exhibe diferencias importantes con aquella propia de la CCS, del loess y de los sedimentos de áreas prístinas, presentando, en general, mayores concentraciones de elementos traza y ETR.…”

Section: Caracterización Geoquímica De Los Sedimentosunclassified

Propiedades geoquímicas y magnéticas de sedimentos como indicadores de contaminación. Caso de estudio: río Suquía, Córdoba, Argentina

Sepúlveda¹,

Lecomte²,

Pasquini³

et al. 2019

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La cuenca del río Suquía (superficie ~6300 km2) es un sistema hidrológico de mediana extensión, ubicado en la provincia de Córdoba, en la región central de Argentina. El río Suquía nace del lago San Roque, discurre por sectores serranos, atraviesa una ciudad densamente poblada (Córdoba: 1.5 millones de habitantes) y continúa su curso por la llanura Chaco-Pampeana donde se desarrollan actividades agrícolas y ganaderas. Debido a diversas actividades urbanas e industriales, el río recibe, a lo largo de su curso, aportes contaminantes, los cuales se depositan aguas abajo, en el lecho del mismo. Los resultados de los análisis geoquímicos y magnéticos de los sedimentos depositados en el lecho principal del río, permitieron evaluar el grado de contaminación de este sistema natural. Se extrajeron muestras de sedimento de fondo del cauce del río y se separaron distintas fracciones granulométricas para determinaciones magnéticas. Se utilizaron métodos de magnetismo ambiental (susceptibilidad magnética y magnetización remanente anhistérica) para la identificación y cuantificación de minerales magnéticos, entre ellos, ferrimagnéticos del tipo magnetita. En la fracción limo-arcilla (< 62.5 mm) se determinaron óxidos mayores y elementos traza. Desde el punto de vista geoquímico los sedimentos evidencian un bajo grado de madurez mineralógica y son equivalentes a lutitas y lutitas ricas en Fe. Los indicadores de contaminación (Índice de Geoacumulación, Igeo; Factor de Enriquecimiento, FE; Contaminación Urbana Industrial, C.U.I.) arrojaron los valores más altos en el área serrana, donde también se registraron los mayores valores de susceptibilidad magnética, debido a factores naturales potenciados por la explotación de canteras. En el área urbana se registraron los valores más bajos de contaminación, mientras que, en la zona rural, se determinó un grado de contaminación moderado a alto, asociado a las actividades agrícolas propias del uso de la tierra. De este modo, los procesos que dan origen a las características geoquímicas y magnéticas de estos sedimentos se diferencian espacialmente a lo largo de la cuenca y se deben a factores tanto naturales como antrópicos. Además, las concentraciones de metales en los sedimentos se han incrementado en la última década en toda la cuenca. La correlación significativa entre variables geoquímicas y parámetros magnéticos demuestra la potencialidad de estudios combinados como una metodología de monitoreo ambiental en sistemas hídricos.

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Geochemistry of a soil catena developed from loess deposits in a semiarid environment, Sierra Chica de Córdoba, central Argentina

Cited by 26 publications

References 42 publications

A 55‐year‐old natural experiment gives evidence of the effects of changes in fire frequency on ecosystem properties in a seasonal subtropical dry forest

A 55‐year‐old natural experiment gives evidence of the effects of changes in fire frequency on ecosystem properties in a seasonal subtropical dry forest

In situ weathering of rocks or aeolian silt deposition: key parameters for verifying parent material and pedogenesis in the Opawskie Mountains—a case study from SW Poland

Propiedades geoquímicas y magnéticas de sedimentos como indicadores de contaminación. Caso de estudio: río Suquía, Córdoba, Argentina

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