Biogenic and pedogenic controls on Si distributions and cycling in grasslands of the Santa Cruz soil chronosequence, California

White, Art F.; Vivit, Davison V.; Schulz, Marjorie S.; Bullen, T. D.; Evett, Rand R.; Aagarwal, Jugdeep

doi:10.1016/j.gca.2012.06.009

Cited by 79 publications

(65 citation statements)

References 96 publications

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“…Diminishing SOC concentrations with depth indicate a balance between inputs of fresh organic material and microbial degradation (Lucas 2001). A similar pattern for ASi is consistent with that observed by others investigating ASi and/or phytolith distribution in various soil and landscape types (Blecker et al 2006;Saccone et al 2008;Struyf et al 2010;Cornelis et al 2011a;White et al 2012) and suggests a continuous dissolution of ASi with depth (Alexandre et al 2011;White et al 2012). Replenishment of fresh ASi material to the topsoil by litterfall maintains this distribution pattern.…”

Section: Soc and Asi Distribution In Soilsupporting

confidence: 87%

“…Relative to SOC, this difference could be explained by a large contribution of ASi stored in the mineral layer. In contrast to the top organic layer, a larger fraction of the ASi found in the mineral layer could be of pedogenic origin (Sauer et al 2006;White et al 2012;Barão et al 2014). A higher contribution of pedogenic Si fractions could hence decouple any putative relationship between SOC and biologically formed Si fractions in the mineral layer.…”

Section: Partitioning Of Soc and Asi Storage In Arctic Landscapesmentioning

confidence: 99%

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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: Soc and Asi Distribution In Soilsupporting

confidence: 87%

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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“…1). Significant differences in straw Si concentrations were observed between the two geographical locations, likely reflecting variation in edaphic factors such as pH or silicate mineral composition which affect the plant-availability of Si [37,38]. Nevertheless, the interval of Si concentrations observed in the present work was comparable to previous studies with wheat carried out in Oregon, USA [24].…”

Section: Discussionsupporting

confidence: 77%

Concentration of mineral elements in wheat (Triticum aestivum L.) straw: Genotypic differences and consequences for enzymatic saccharification

Murozuka

Bang

Frydenvang

et al. 2015

Biomass and Bioenergy

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“…Outside the lab environment little data is available on the solubility of the PSi fraction in soils and the importance of its contribution to the Si export towards rivers. White et al (2012) used Ge:Si ratios to trace controls on pore-water Si levels. They suggested a seasonal control of PSi on pore-water DSi levels through the formation and dissolution of poorly-crystalline Si fractions, exemplifying its potential importance.…”

Section: Introductionmentioning

confidence: 99%

“…Although several studies have confirmed that the size of AlkExSi pool in soils depends on land use and land management (Clymans et al, 2011, Guntzer et al, 2011, Keller et al, 2012, Vandevenne et al, 2012, few studies so far focused on the role of the different fractions in the AlkExSi pool in soils in controlling the actual Si release (Cornelis et al, 2010, Cornelis et al, 2014, White et al, 2012. Pore-water samples collected in the field can only be used to a limited extent to assess controls on AlkExSi solubility.…”

Section: Introductionmentioning

confidence: 99%

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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Biogenic and pedogenic controls on Si distributions and cycling in grasslands of the Santa Cruz soil chronosequence, California

Cited by 79 publications

References 96 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

Concentration of mineral elements in wheat (Triticum aestivum L.) straw: Genotypic differences and consequences for enzymatic saccharification

Factors controlling Si export from soils: A soil column approach

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