Soil microaggregates store phytoliths in a sandy loam

Li, Zimin; Tombeur, Félix de; Linden, Charles Vander; Cornélis, Jean-Thomas; Delvaux, Bruno

doi:10.1016/j.geoderma.2019.114037

Cited by 30 publications

(26 citation statements)

References 74 publications

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“…Given that the dominant plant rooting depth in the studied La Selva soils is around 1 m (Veldkamp et al., 2003), the high f bio Si/ f diss Si ratio may reflect the localized uptake of Si by plants within the studied soil horizons. Several previous studies have postulated significant phytolith accumulation in tropical soils (e.g., Clarke, 2003; Meunier et al., 1999; Song et al., 2012), and especially efficient preservation within microaggregate particles (Li, de Tombeur, et al., 2020), which may allow a fraction of phytolith aSi to be efficiently preserved within the top 2 m soil and possibly deeper. The proportional dominance of plant‐recycled Si in highly weathered soils was also recently directly demonstrated using rice growth experiments in the lab (Li, Cornelis, et al., 2020).…”

Section: Discussionmentioning

confidence: 96%

Ge and Si Isotope Behavior During Intense Tropical Weathering and Ecosystem Cycling

Baronas

West

Burton

et al. 2020

Global Biogeochemical Cycles

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Chemical weathering of volcanic rocks in warm and humid climates contributes disproportionately to global solute fluxes. Geochemical signatures of solutes and solids formed during this process can help quantify and reconstruct weathering intensity in the past. Here, we measured silicon (Si) and germanium (Ge) isotope ratios of the soils, clays, and fluids from a tropical lowland rainforest in Costa Rica. The bulk topsoil is intensely weathered and isotopically light (mean ± 1σ: δ30Si = −2.1 ± 0.3‰, δ74Ge = −0.13 ± 0.12‰) compared to the parent rock (δ30Si = −0.11 ± 0.05‰, δ74Ge = 0.59 ± 0.07‰). Neoforming clays have even lower values (δ30Si = −2.5 ± 0.2‰, δ74Ge = −0.16 ± 0.09‰), demonstrating a whole‐system isotopic shift in extremely weathered systems. The lowland streams represent mixing of dilute local fluids (δ30Si = 0.2 − 0.6‰, δ74Ge = 2.2 − 2.6‰) with solute‐rich interbasin groundwater (δ30Si = 1.0 ± 0.2‰, δ74Ge = 4.0‰). Using a Ge‐Si isotope mass balance model, we calculate that 91 ± 9% of Ge released via weathering of lowland soils is sequestered by neoforming clays, 9 ± 9% by vegetation, and only 0.2 ± 0.2% remains dissolved. Vegetation plays an important role in the Si cycle, directly sequestering 39 ± 14% of released Si and enhancing clay neoformation in surface soils via the addition of amorphous phytolith silica. Globally, volcanic soil δ74Ge closely tracks the depletion of Ge by chemical weathering (τGe), whereas δ30Si and Ge/Si both reflect the loss of Si (τSi). Because of the different chemical mobilities of Ge and Si, a δ74Ge‐δ30Si multiproxy system is sensitive to a wider range of weathering intensities than each isotopic system in isolation.

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Section: Discussionmentioning

confidence: 96%

Ge and Si Isotope Behavior During Intense Tropical Weathering and Ecosystem Cycling

Baronas

West

Burton

et al. 2020

Global Biogeochemical Cycles

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“…Previous studies found that the main components of CaCl 2 –Si are monosilicic acid and polysilicic acid (Cornelis et al., 2011), which mainly came from the weathering of silicate minerals (Blecker et al., 2006; Drever, 1994) and the dissolution and release of Na 2 CO 3 –Si (Alexandre et al., 1997; Cornelis et al., 2011). Organic acids secreted by plants will affect weathering of silicate minerals and the dissolution of Na 2 CO 3 –Si and then indirectly affect the amount of CaCl 2 –Si in soil (Knoll & James, 1987; Z. Li et al., 2020; Marxen et al., 2016). Part of silicic acid in the soil will also undergo polymerization and dehydration reaction, forming secondary silicate minerals (Cornelis & Delvaux, 2016).…”

Section: Discussionmentioning

confidence: 99%

Variation of soil silicon fractions and bioavailability during centennial‐scale evolution of ecosystem after glacier retreat

Song

Yang

et al. 2022

Soil Science Soc of Amer J

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The biogeochemical cycle of Si plays an important role in maintaining the function and stability of ecosystems. Although there have been many studies on long-term silicate weathering, there are few reports on Si fractions and cycling in early ecosystem development. Using optimized sequential chemical extraction processes, this study quantified soil Si fractions of the eluvial horizon and deposition layers in Hailuogou Glacier Retreat Area of Gongga Mountain, Southwest China. The results showed that plant-available Si (NaAc-Si) content decreased significantly from 33.40 to 2.16 mg kg −1 with the increase of soil age. There was a significantly positive correlation (p < .01) between soil pH and NaAc-Si. Within the labile Si fractions, the largest fraction was amorphous Si (Na 2 CO 3 -Si) (165.35 ± 81.50 mg kg −1 ), followed by pedogenic oxides/hydroxides chemisorbed Si (Oxalate-Si) (135.13 ± 66.83 mg kg −1 ), Si adsorbed on the surface of inorganic soil particles (Acetic-Si) (9.66 ± 4.27 mg kg −1 ), and soluble Si (CaCl 2 -Si) (4.89 ± 1.68 mg kg −1 ). Compared with Stage 1 (i.e., a variety of pioneer species symbiosis stage) after glacier retreat, the storage of these four labile Si fractions in Stage 3 (i.e., climax species stage) decreased by 45.95% (CaCl 2 -Si), 42.98% (Acetic-Si), 67.34% (Oxalate-Si), and 75.24% (Na 2 CO 3 -Si), respectively, due to the absorption and utilization of Si by plants. Our study implies that the multiple transformations of different Si fractions in soils and the absorption and return of Si by plants can keep the CaCl 2 -Si pool in dynamic equilibrium, which provides a basis for the stability of ecosystem functions during the vegetation evolution after glacier retreat.

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“…Six ecosystems were differentiated by soil phytolith assemblages in the ancient Maya tropical lowlands [53]. [54] found that soil micro aggregates which was the topsoil size fraction account for over 60 percent of the phytoliths and control bioavailable Si as phytoliths protect the element from rapid dissolution and release. Phytoliths gave evidence of the changes in regional climate [55].…”

Section: Introductionmentioning

confidence: 99%

Phytolith profile of Acrachne racemosa (B. Heyne ex Roem. & Schult.) Ohwi (Cynodonteae, Chloridoideae, Poaceae)

et al. 2022

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Acrachne racemosa (B. Heyne. ex Roem. & Schult.) Ohwi of the subfamily Chloridoideae of the family Poaceae is an economically important grass species. Grasses are characterized by deposits of silica in the cells or tissues in the form of phytoliths which protect them from various types of biotic and abiotic stresses. Owing to variable shape and specificity of morphotypes, phytolith helps in taxonomical studies, reconstruction of paleoenvironments and prediction of climate changes. The present study focussed on developing a phytolith profile of the selected species. For isolation of phytolith, Dry Ashing Method was employed, and by epidermal peeling, in-situ location of phytoliths was deciphered. In the present study, silica percentage was studied from different parts of the plant and the maximum amount was found in the leaf. Frequency and morphometric data of phytolith morphotypes from different parts of the plants were also collected and analyzed. The strongest correlation was found between phytolith types of root and culm by Pearson’s correlation coefficient supported by cluster analysis. The saddle type of phytoliths had the highest frequency in the leaf; other types of phytoliths in different parts of the plant were bilobate, blocky types, elongate types, trapezoids, triangular, cross, sinuate elongate, tabular types, globular types. Functional groups and amorphous polymorphic phases of silica were also analyzed by FTIR and XRD. It was concluded that phytolith types are controlled by parts of plant body and by anatomical and environmental factors.

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Soil microaggregates store phytoliths in a sandy loam

Cited by 30 publications

References 74 publications

Ge and Si Isotope Behavior During Intense Tropical Weathering and Ecosystem Cycling

Ge and Si Isotope Behavior During Intense Tropical Weathering and Ecosystem Cycling

Variation of soil silicon fractions and bioavailability during centennial‐scale evolution of ecosystem after glacier retreat

Phytolith profile of Acrachne racemosa (B. Heyne ex Roem. & Schult.) Ohwi (Cynodonteae, Chloridoideae, Poaceae)

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