『Abstract
　Silicon is one of the most important elements in the current age of the anthropocene. It has numerous industrial applications, and supports a high-tech multi-billion Euro industry. Silicon has a fascinating biological and geological cycle, interacting with other globally important biogeochemical cycles. In this review, we bring together both biological and geological aspects of the silicon cycle to provide a general, comprehensive review of the cycling of silicon in the environment. We hope this review will provide inspiration for researchers to study this fascinating element, as well as providing a background environmental context to those interested in silicon.

Keywords: Silicon biogeochemistry; Geology; Biology; Carbon; Nitrogen; Phosphorus』

1. An important biogeochemical cycle
　2. Silicon cycling in the ocean and coastal ecosystems
　2.1. The biological Si-pump
　2.2. Silicon and eutrophication of coastal and lake ecosystems
3. The uptake of silicon into the terrestrial biogeochemical Si cycle
　3.1. The mineralogical soil pool of ecosystem silicon
　3.2. Dissolved silica in the soils
　3.3. The biological silicon pool
4. The ocean-terrestrial link in the global silicon cycle
　4.1. Forests
　4.2. Grasslands
　4.3. Other graminoid dominated ecosystems
5. Conclusions
Acknowledgements
References