Interrelations of vegetal cover, silicophytolith content and pedogenesis of Typical Argiudolls of the Pampean Plain, Argentina

Borrelli, Natalia Lorena; Osterrieth, Margarita Luisa; Marcovecchio, Jorge Eduardo

doi:10.1016/j.catena.2008.05.001

Cited by 34 publications

(20 citation statements)

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“…This fact is similar in the Typical Argiudolls of the Pampean Plains. Within the amorphous silica fraction, phytoliths and volcanic shards show different features of weathering (Borrelli et al 2008). Soil phytoliths show different weathering degrees which is evident not only in the important percentage of unidentified phytoliths (10-40%) but also in the important proportion of phytoliths with defined morphologies that show several degrees of weathering ( Fig.…”

Section: Phytolith's Weathering State In Soilsmentioning

confidence: 95%

“…This is in agreement with soil phytolith assemblages, since these correspond to phytolith morphotypes produced by Poaceae (smooth elongates, rectangulars, rondels, pointshaped, and dumbbells among others). Therefore, in the arboreal plots, soil phytolith assemblages reflect previous Table 3 Silica concentration (SiO 2 , μmol/L) in the soil saturated paste extract and in the soil solution vegetation, and the great development of organic horizons (9-11 cm) contributes to decrease phytolith losses by erosion (Borrelli et al 2008). …”

Section: Relationship Between Plant Phytolith Production and Soil Phymentioning

confidence: 98%

“…So, the similar soil phytolith content founded in the arboreal plots (acacia and eucalyptus plantations), with respect to the grass plot, could not be explained by the phytolith contribution of the present vegetation. Instead, they could be explained by the phytoliths inherited from the grass vegetal cover previous forestation and from the loessic parent material (Borrelli et al 2008). In the Pampean Plain, grasslands and paleograsslands evolution have been recurrent during the Quaternary; thus, phytolith contribution to the soil has been recurrent during this time too.…”

Section: Relationship Between Plant Phytolith Production and Soil Phymentioning

confidence: 98%

“…In the areas forested with eucalyptus, pH values are more acidic (4.2) in the A horizon. The soil texture is silt loam, with the silt (55-70%) and clay (20-30%) fractions being the most representative (Borrelli et al 2008). Soil mineralogy is predominantly composed by light minerals: Ca-Na feldspars (25-30%), vitroclastics (25-30%), quartz (20%), volcanic ashes (10%), and K felspars (5%) (Borrelli et al 2009).…”

Section: Area Descriptionmentioning

confidence: 99%

“…Typical Argiudolls are the representative soils, originating from eolian sediments linked to the latest arid cycle of the late Pleistocene-early Holocene (Osterrieth and Cionchi 1985). In these soils, light minerals predominate and those composed of amorphous silica, both of inorganic (volcanic ashes and vitroclastics) and organic origin (phytoliths, diatoms, and sponges), are present with values over 40% of the total amount of mineral components of the soil (Osterrieth 2000(Osterrieth , 2006(Osterrieth , 2008Borrelli et al 2008).…”

Section: Introductionmentioning

confidence: 98%

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Silica content in soil solution and its relation with phytolith weathering and silica biogeochemical cycle in Typical Argiudolls of the Pampean Plain, Argentina—a preliminary study

et al. 2010

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Purpose Little is known on the silica biogeochemical cycle in terrestrial environments. The aim of this work is to assess phytolith's role on the biogeochemical cycle of Si in Typical Argiudolls under different vegetation of the Pampean Plain, Argentina. Materials and methods The work has been developed in three plots with different vegetal cover: grasses and shelter-belt plantations of Acacia melanoxylon-Celtis tala and Eucalyptus globulus-C. tala. The heavy liquid separation in the soil samples was realized with sodium polytungstate. The silica concentration of the soil solution and groundwaters was determined by UV-VIS spectrophotometry. Results and discussion Acacia and eucalyptus do not produce phytoliths; instead, Dactylis glomerata (grass) is a silica-accumulating species, and their phytolith assemblage is composed basically by oblong and crenate, smooth elongate, rectangular and prickles within isolated phytoliths, and smooth long cells articulated. Phytolith content in soils decreases with depth. Total stock of phytoliths represents 5.9 to 12.9 wt.% and is higher in the arboreal plots. In the A horizons, phytolith fraction represents about 59.6×10 3 to 103.5×10 3 kg/ha. In these horizons, 90.7-94.4% of the phytolith content constitutes the labile pool and 9.3-5.6% the stable pool. In the arboreal plots, SiO 2 content in soil solution is higher (406-1,106 μmol/L) and decreases with depth, while in the grass plot, SiO 2 content is lesser (421-777 μmol/L) and increases with depth; probably because of differences in the nutritional requirements and root design between vegetal species, therefore, in the different depth uptake from the soil solution. In groundwaters, silica content is very high (932 μmol/L). Conclusions Phytoliths are very representative in Typical Argiudolls and show a great degree of weathering so they could be into account in the biogeochemical studies since they could contribute with silica content in the soil solution, affecting the terrestrial silica biogeochemical cycle.

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Section: Phytolith's Weathering State In Soilsmentioning

confidence: 95%

Section: Relationship Between Plant Phytolith Production and Soil Phymentioning

confidence: 98%

Section: Relationship Between Plant Phytolith Production and Soil Phymentioning

confidence: 98%

Section: Area Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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