Phytolith transport in soil: A field study using fluorescent labelling

Fishkis, Olga; Ingwersen, Joachim; Lamers, Marc; Denysenko, Dmytro; Streck, Thilo

doi:10.1016/j.geoderma.2010.03.012

Cited by 95 publications

(65 citation statements)

References 53 publications

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“…Other studies, applying various techniques to determine ASi storage in soil, support this shift from biogenic Si to pedogenic Si fractions with depth (Saccone et al 2007;Sommer et al 2013;Georgiadis et al 2014;Blecker et al 2006;Cornelis et al 2014). However, some of the ASi in the mineral layer may be of biogenic origin since ASi can be translocated downward the soil profile (Fishkis et al 2010) through the process of e.g. cryoturbation or bioturbation.…”

Section: Partitioning Of Soc and Asi Storage In Arctic Landscapesmentioning

confidence: 99%

Amorphous silica pools in permafrost soils of the Central Canadian Arctic and the potential impact of climate change

et al. 2015

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We investigated the distribution, storage and landscape partitioning of soil amorphous silica (ASi) in a central Canadian region dominated by tundra and peatlands to provide a first estimate of the amount of ASi stored in Arctic permafrost ecosystems. We hypothesize that, similar to soil organic matter, Arctic soils store large amounts of ASi which may be affected by projected climate changes and associated changes in permafrost regimes. Average soil ASi storage (top 1 m) ranged between 9600 and 83,500 kg SiO 2 ha -1 among different land-cover types. Lichen tundra contained the lowest amounts of ASi while no significant differences were found in ASi storage among other land-cover types. Clear differences were observed between ASi storage allocated into the top organic versus the mineral horizon of soils. Bog peatlands, fen peatlands and wet shrub tundra stored between 7090 and 45,400 kg SiO 2 ha -1 in the top organic horizon, while the corresponding storage in lichen tundra, moist shrub-and dry shrub tundra only amounted to 1500-1760 kg SiO 2 ha -1 . Diatoms and phytoliths are important components of ASi storage in the top organic horizon of peatlands and shrub tundra systems, while it appears to be a negligible component of ASi storage in the mineral horizon of shrub tundra classes. ASi concentrations decrease with depth in the soil profile for fen peatlands and all shrub tundra classes, suggesting recycling of ASi, whereas bog peatlands appeared to act as sinks retaining stored ASi on millennial time scales. Our results provide a conceptual framework to assess the potential effects of climate change impacts on terrestrial Si cycling in the Arctic. We believe that ASi stored in peatlands are particularly sensitive to climate change, because a larger fraction of the ASi pool is stored in perennially frozen ground compared to shrub tundra systems. A likely outcome of climate warming and permafrost thaw could be mobilization of previously frozen ASi, altered soil storage of biogenically derived ASi and an increased Si flux to the Arctic Ocean.

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Section: Partitioning Of Soc and Asi Storage In Arctic Landscapesmentioning

confidence: 99%

Amorphous silica pools in permafrost soils of the Central Canadian Arctic and the potential impact of climate change

et al. 2015

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“…These plant-produced, diagnostic silica particles are well preserved even in acid, clay-rich tropical soils (Piperno 2006). As for SOM, there is a general relationship between age of phytoliths and the depth at which they are found in soil (Fishkis et al 2010;Piperno 2006). For SOM, the relationship is due in part to downward percolation of organic acids over time.…”

Section: Limits To Inferences Of Vegetation History In Tropical Wetlamentioning

confidence: 99%

Origin of mound-field landscapes: a multi-proxy approach combining contemporary vegetation, carbon stable isotopes and phytoliths

et al. 2011

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Background and aims Seasonally flooded South American savannas harbor different kinds of mound-field landscapes of largely unknown origin. A recent study used soil carbon-isotope depth profiles and other proxies to infer vegetation history in murundu landscapes in Brazil. Results suggested that differential erosion, not building-up processes (e.g., termite mounds), produced mounds. We tested this approach to inferring mound origin in a mound-field landscape in French Guiana. Methods We examined carbon-isotope depth profiles of soil organic matter, phytolith profiles and contemporary vegetation composition in mounds and inter-mounds.Results Relative abundance of C3 and C4 plants across habitats was very different from that in murundu landscapes; C3 plants were better represented in inter-mounds than on mounds. Habitat differences in C3/C4 distribution were subtler than in murundu landscapes, limiting inference of vegetation history based on carbon isotopes. Still, carbon-isotope and phytolith depth profiles gave similar pictures of vegetation history, both favoring a building-up hypothesis, corroborating other evidence that these mounds are vestiges of ancient agricultural raised fields. Conclusions Carbon-isotope depth profiles are unlikely to be adequate for deciphering origin of mound-field landscapes from vegetation history in Plant Soil (2012) 351:337-353

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“…In both study areas, an evolution from BSi dominated (and virtual no PSi) to PSi dominated (and virtually no BSi) horizons with depth was observed. Phytoliths were extracted from soils and observed by microscopy in the O (for the forest soils) and A horizons, but were not observed deeper in the soil profiles (Vandevenne et al, submitted for publication), suggesting that only limited vertical transport of phytoliths occurred at our sites (Fishkis et al, 2010a(Fishkis et al, , 2010b. The strong correlation between the total PSi amount and Si oxalate (Table 2) for the Cambisols indicates that the PSi mainly consists of Si that is absorbed on Al and Fe-oxides (Barão et al, 2014).…”

Section: Study Sites and Background Datamentioning

confidence: 84%

Factors controlling Si export from soils: A soil column approach

Ronchi

Barão

Clymans

et al. 2015

CATENA

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The release of dissolved silicon (DSi) from A and B horizons was investigated with leaching tests on unsaturated columns. As forest A horizons have larger biogenic Si (BSi) pools than arable lands, we compared the Si release from a forest and a cropland from the same geographical region developed on a Luvisol in Belgium and a Cambisol in Sweden. The A horizons released a quickly dissolving Si fraction in contrast to the B horizons, which did contain no or only little amounts of BSi and released lower Si concentrations. Our experiments show that Si export from forest soils is high because of the presence of a large reservoir of soluble BSi as well as due to the acidity of the soil (pH b 4). Leaching at two different water fluxes revealed that export in forest soils was transport controlled while cropland soils were in equilibrium.

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Phytolith transport in soil: A field study using fluorescent labelling

Cited by 95 publications

References 53 publications

Amorphous silica pools in permafrost soils of the Central Canadian Arctic and the potential impact of climate change

Amorphous silica pools in permafrost soils of the Central Canadian Arctic and the potential impact of climate change

Origin of mound-field landscapes: a multi-proxy approach combining contemporary vegetation, carbon stable isotopes and phytoliths

Factors controlling Si export from soils: A soil column approach

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