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- Title
Impact of agriculture on silicon availability in soils: a paired site approach.
- Authors
Cornu, Sophie; Meunier, Jean-Dominique; Barboni, Doris; Delvigne, Camille; Ouedraogo, Fréderic; Keller, Catherine; Borschneck, Daniel; Lucas, Yves
- Abstract
Silicon (Si) is the second most abundant element of the Earth’s crust, after oxygen. Plantsplay an important role in the terrestrial Si cycle, which is altered by agriculture.Silicon is recognized as a beneficial element for plants which show highly variableSi content (from below 1 to higher than 100 mg g−1 dry weight) depending onthe plant type and the soil type. Poaceae, as rice and wheat, are considered as Siaccumulators since they contain more than 10 mg Si g−1 dry weight. The question is:does continuous wheat cultivation induce a depletion of available Si in soils on along-term ? Si is indeed used as fertilizer in some countries (Japan, China, SouthAmerica and USA (Florida)) to overcome the depletion of the bioavailable Si inrice cultivation. Is such a depletion also observed for wheat cultivation in Frenchsoils? To answer this question we selected paired sites on different soil types and parent materialto compare the impact of land use (crop and forest) on Si soil availability. Bothloess and calcareous parent materials were selected. On these two parent materials,two stages of soil development were selected: Luvisol and Albeluvisol for loess,and Calcosol and Calcisol for calcareous parent material. These soils differed bytheir pH, < 2 μm content and organic carbon (OC) content. OC content and pHalso differed between forest and cultivated land uses. Si extracted by CaCl2 wasalso measured to estimate Si availability. Si availability increased with the pH,as a result, Si availability was lower in forested soils than in cropped soils. Thedifference was higher for Albeluvisol and Luvisols that had lower pH than Calcosol andCalsisol. Solid phases contributing to available Si will be discussed in the light of soil phytolithcontents, mineralogical characteristics of the < 2 μm fraction (X-ray diffraction, particlesize distribution by laser particle-sizer, CEC determination) and Fe-oxides extractions(Tamm, CBD). Results showed that available Si is mainly extracted from clay minerals in theconsidered soils. This communication benefits from the financial support of the BIOSiSOl projetANR-14-CE01-0002.
- Subjects
SOILS; SOIL classification; FORESTS &; forestry; SOIL formation; CLAY minerals; PARTICLE size determination; INCEPTISOLS
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article