Factors controlling Si export from soils: A soil column approach

Ronchi, Benedicta; Barão, Lúcia; Clymans, Wim; Vandevenne, Floor; Batelaan, Okke; Govers, Gérard; Struyf, Eric; Dassargues, Alain

doi:10.1016/j.catena.2015.05.007

Cited by 15 publications

(20 citation statements)

References 73 publications

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“…, Ronchi et al. ), because (1) accumulation of BSi in vegetation delays the export of Si via fluvial systems (Meunier et al. , Struyf et al.…”

Section: Introductionmentioning

confidence: 99%

“…In terrestrial ecosystems, vascular plants take up large quantities of Si from soil solutions in dissolved form (DSi) and return Si to the soil as micrometer-scale amorphous SiO 2 bodies termed phytoliths (more generally known as biogenic Si; BSi) (Bartoli 1983, Lucas 2001, Struyf and Conley 2012. This biological recycling is an important component of Si dynamics at soil-column to watershed scales (Alexandre et al 1997, Meunier et al 1999, Sommer et al 2006, Gérard et al 2008, Ronchi et al 2015, because (1) accumulation of BSi in vegetation delays the export of Si via fluvial systems (Meunier et al 1999, Struyf et al 2009); (2) Si uptake alters pore-water chemistry and therefore the stability of other Si-bearing phases (Lucas et al 1993, Velde andBarré 2009);and (3) the BSi that accumulates in organic soil horizons (i.e., the forest floor) represents a source of particularly soluble Si (Bartoli 1983, Sommer et al 2006. Because 20-80% of DSi in soil solutions derives from dissolution of BSi (Bartoli 1983, Derry et al 2005, Gérard et al 2008, Lugolobi et al 2010), cycling of Si by vegetation is known as "the terrestrial Si filter" (Struyf and Conley 2012).…”

Section: Introductionmentioning

confidence: 99%

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Silica uptake and release in live and decaying biomass in a northern hardwood forest

Clymans

Conley

Frings

et al. 2016

Ecology

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Abstract. In terrestrial ecosystems, a large portion (20-80%) of the dissolved Si (DSi) in soil solution has passed through vegetation. While the importance of this "terrestrial Si filter" is generally accepted, few data exist on the pools and fluxes of Si in forest vegetation and the rate of release of Si from decomposing plant tissues. We quantified the pools and fluxes of Si through vegetation and coarse woody debris (CWD) in a northern hardwood forest ecosystem (Watershed 6, W6) at the Hubbard Brook Experimental Forest (HBEF) in New Hampshire, USA. Previous work suggested that the decomposition of CWD may have significantly contributed to an excess of DSi reported in stream-waters following experimental deforestation of Watershed 2 (W2) at the HBEF. We found that woody biomass (wood + bark) and foliage account for approximately 65% and 31%, respectively, of the total Si in biomass at the HBEF. During the decay of American beech (Fagus grandifolia) boles, Si loss tracked the whole-bole mass loss, while yellow birch (Betula alleghaniensis) and sugar maple (Acer saccharum) decomposition resulted in a preferential Si retention of up to 30% after 16 yr. A power-law model for the changes in wood and bark Si concentrations during decomposition, in combination with an exponential model for whole-bole mass loss, successfully reproduced Si dynamics in decaying boles. Our data suggest that a minimum of 50% of the DSi annually produced in the soil of a biogeochemical reference watershed (W6) derives from biogenic Si (BSi) dissolution. The major source is fresh litter, whereas only ~2% comes from the decay of CWD. Decay of tree boles could only account for 9% of the excess DSi release observed following the experimental deforestation of W2. Therefore, elevated DSi concentrations after forest disturbance are largely derived from other sources (e.g., dissolution of BSi from forest floor soils and/or mineral weathering).

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“…, Ronchi et al. ), because (1) accumulation of BSi in vegetation delays the export of Si via fluvial systems (Meunier et al. , Struyf et al.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Silica uptake and release in live and decaying biomass in a northern hardwood forest

Clymans

Conley

Frings

et al. 2016

Ecology

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“…We acknowledge that some difficulties still remain when applying the method we have used. The dissolution in NaOH does not show a true reactivity within soils: the non-biogenic AlkExSi fractions probably have lower solubility in soils (Ronchi et al, 2015) or water (Unzué-Belmonte et al, 2016) than BSi. Using the Si / Al ratio thresholds described for temperate soils to determine the character of the fractions in a different soil introduces some concerns.…”

Section: Importance Of Scales and Methodsmentioning

confidence: 96%

Land use change affects biogenic silica pool distribution in a subtropical soil toposequence

et al. 2017

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Abstract. Land use change (deforestation) has several negative consequences for the soil system. It is known to increase erosion rates, which affect the distribution of elements in soils. In this context, the crucial nutrient Si has received little attention, especially in a tropical context. Therefore, we studied the effect of land conversion and erosion intensity on the biogenic silica pools in a subtropical soil in the south of Brazil. Biogenic silica (BSi) was determined using a novel alkaline continuous extraction where Si ∕ Al ratios of the fractions extracted are used to distinguish BSi and other soluble fractions: Si ∕ Al > 5 for the biogenic AlkExSi (alkaline-extractable Si) and Si ∕ Al < 5 for the non-biogenic AlkExSi. Our study shows that deforestation can rapidly (< 50 years) deplete the biogenic AlkExSi pool in soils depending on the slope of the study site (10–53 %), with faster depletion in steeper sites. We show that higher erosion in steeper sites implies increased accumulation of biogenic Si in deposition zones near the bottom of the slope, where rapid burial can cause removal of BSi from biologically active zones. Our study highlights the interaction of erosion strength and land use for BSi redistribution and depletion in a soil toposequence, with implications for basin-scale Si cycling.

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“…We acknowledge that some difficulties still remain when applying the method we have used. The dissolution in NaOH does not show a true reactivity within soils: the non-biogenic AlkExSi fractions probably have lower solubility in soils (Ronchi et al, 2015) or water than BSi. Using the Si / Al ratio thresholds described for temperate soils to determine the character of the fractions in a different soil introduces some concerns.…”

Section: Importance Of Scales and Methodsmentioning

confidence: 96%