Cycle et rôle du silicium d'origine végétale dans les écosystèmes forestiers tempérés

Bartoli, F.; Souchier, B.

doi:10.1051/forest/19780302

Cited by 34 publications

(38 citation statements)

References 16 publications

(18 reference statements)

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“…As old needles accumulate more Si than young ones, needle age may influence Si accumulation (Bartoli and Souchier 1978). Considering the mean concentration of Si in young needles (Table 3), conifers accumulate less Si in comparison with the broad-leaved trees (Hodson et al 2005).…”

Section: Discussionmentioning

confidence: 99%

“…The quantity of Si recycled within the soil-tree cycle may be species-dependent since angiosperms enhance the weathering to a greater degree than gymnosperms (Moulton et al 2000;Johnson-Maynard et al 2005). Relative to broadleaved species, conifers generally accumulate low amounts of Si in their shoots (Geis 1973; Bartoli and Souchier 1978;Klein and Geis 1978;Carnelli et al 2001;Hodson et al 2005). Within conifers, Si accumulation by pine is ten times below than spruce (Hodson and Sangster 1999).…”

Section: Introductionmentioning

confidence: 99%

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Tree species impact the terrestrial cycle of silicon through various uptakes

et al. 2009

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The quantification of silicon (Si) uptake by tree species is a mandatory step to study the role of forest vegetations in the global cycle of Si. Forest tree species can impact the hydrological output of dissolved Si (DSi) through root induced weathering of silicates but also through Si uptake and restitution via litterfall. Here, monospecific stands of Douglas fir, Norway spruce, Black pine, European beech and oak established in identical soil and climate conditions were used to quantify Si uptake, immobilization and restitution. We measured the Si contents in various compartments of the soil-tree system and we further studied the impact of the recycling of Si by forest trees on the DSi pool. Si is mainly accumulated in leaves and needles in comparison with other tree compartments (branches, stembark and stemwood). The immobilization of Si in tree biomass represents less than 15% of the total Si uptake. Annual Si uptake by oak and European beech stands is 18.5 and 23.3 kg ha -1 year -1 , respectively. Black pine has a very low annual Si uptake (2.3 kg ha -1 year -1 ) in comparison with Douglas fir (30.6 kg ha -1 year -1 ) and Norway spruce (43.5 kg ha -1 year -1 ). The recycling of Si by forest trees plays a major role in the continental Si cycle since tree species greatly influence the uptake and restitution of Si. Moreover, we remark that the annual tree uptake is negatively correlated with the annual DSi output at 60 cm depth. The land-ocean fluxes of DSi are certainly influenced by geochemical processes such as weathering of primary minerals and formation of secondary minerals but also by biological processes such as root uptake.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tree species impact the terrestrial cycle of silicon through various uptakes

et al. 2009

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“…Evidence linking vegetation to storage of ASi in soils has been available from other ecosystems. In forest soils, higher ASi concentrations in soil profiles occur in forests dominated by beech (relatively rich in ASi) as compared to pine, a species poor in Si (Bartoli and Souchier, 1978;Bartoli, 1983;Saccone et al, 2008). The largest accumulation of ASi in soils has been observed at the island of Réunion from the historical accumulation of phytoliths contained in bamboo, the most efficient Si accumulator among all higher plants (Meunier et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

Vegetation and proximity to the river control amorphous silica storage in a riparian wetland (Biebrza National Park, Poland)

et al. 2009

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Abstract. Wetlands can modify and control nutrient fluxes between terrestrial and aquatic ecosystems, yet little is known of their potential as biological buffers and sinks in the biogeochemical silica cycle. We investigated the storage of amorphous silica (ASi) in a central-European riparian wetland. The variation in storage of ASi in the soil of an undisturbed wetland was significantly controlled by two factors: dominance of sedges and grasses and distance to the river (combined R 2 =78%). Highest ASi storage was found near the river and in sites with a dominance of grasses and sedges, plants which are well known to accumulate ASi. The management practice of mowing reduced the amount of variation attributed to both factors (R 2 =51%). Although ASi concentrations in soils were low (between 0.1 and 1% of soil dry weight), ASi controlled the availability of dissolved silica (DSi) in the porewater, and thus potentially the exchange of DSi with the nearby river system through both diffusive and advective fluxes. A depth gradient in ASi concentrations, with lower ASi in the deeper layers, indicates dissolution. Our results show that storage and recycling of ASi in wetland ecosystems can differ significantly on small spatial scales. Human management interferes with the natural control mechanisms. Our study demonstrates that wetlands have the potential to modify the fluxes of both DSi and ASi along the land-ocean continuum and supports the hypothesis that wetlands are important ecosystems in the biogeochemical cycling of silica.Correspondence to: E. Struyf

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“…Among the plants with an active Si uptake, a difference in Si accumulation is commonly attributed to the density of Si transporters in roots (coded by the low-silicon genes Lsi1 and Lsi2) and in shoots (Lsi6) (Mitani and Ma, 2005;Ma et al, , 2007Yamaji et al, 2008). For the mass-flow driven Si uptake (passive), given a same Si concentration in soil solution, the difference in Si accumulation between plant species could be explained by various transpiration rates (Bartoli and Souchier, 1978;Jones and Handreck, 1967;Raven, 1983;Henriet et al, 2006;Cornelis et al, 2010b).…”

Section: Si Recyling By Vegetationmentioning

confidence: 99%