Human perturbations on the global biogeochemical cycles of coupled Si-C and responses of terrestrial processes and the coastal ocean

Darcy Dan Li*, Abraham Lerman, Fred T. Mackenzie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

We present a model of the global biogeochemical cycle of silicon (Si) that emphasizes its linkages to the carbon cycle and temperature. The Si cycle is a crucial part of global nutrient biogeochemistry regulating long-term atmospheric CO2 concentrations due to silicate mineral weathering reactions involving the uptake of atmospheric CO2 and production of riverine dissolved silica, cations and bicarbonate. In addition and importantly, the Si cycle is strongly coupled to the other nutrient cycles of N, P, and Fe; hence siliceous organisms represent a significant fraction of global primary productivity and biomass. Human perturbations involving land-use changes, burning of fossil fuel, and inorganic N and P fertilization have greatly altered the terrestrial Si cycle, changing the river discharge of Si and consequently impacting marine primary productivity primarily in coastal ocean waters.

Original languageEnglish (US)
Pages (from-to)S289-S291
JournalApplied Geochemistry
Volume26
Issue numberSUPPL.
DOIs
StatePublished - Jun 1 2011

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Geochemistry and Petrology

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