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Silicon is the third most abundant element on Earth(～16.1 wt.％Si) 1.Silicate minerals,in which silicon is bonded with oxygen,make up the largest part of Earths mantle and the moon 2.Silicon is also involved in biological processes via the uptake of silicic acid by plant tissues and the formation of deposits of amorphous silica(e.g.phytoliths) from which it can be released into soils and fluids by physical and chemical weathering 3.Significant isotope fractionation of silicon occurs during silicate weathering and biogeochemical Si cycling,providing powerful geochemical constraints for tracing bio-physico-chemical processes in terrestrial environments 4.So far,the exact mechanism involved in silicon uptake as part of biological process is not well understood,limiting further investigation on the dynamic isotopic fractionation of silicon in environmental sciences.