Abstract
Quantification of silicon recycling by plants is hampered by the lack of physico-chemical data on reactivity of natural phytoliths and plant litter. In this study, we used an experimental approach for determining the silica release rates of phytoliths from tropical and temperate plants (bamboos, horsetails). Results are compared with litter degradation of horsetails and pine needles. Silica release rates suggest that the reactivity of phytolith surface does not depend on topology and geometry of local structures, and does not support the existence of preferential dissolution sites on surface. Litter degradation results suggest that the silica release rate is independent of cellulose hydrolysis that implies the presence of phytoliths in an “inorganic” pool not complexed with organic matter.
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