11:45 AM - 12:05 PM
[ACG40-10] Significant storage of organic carbon in mineral matrix in both land and ocean and the role of Fe
Keywords:iron, organic matter, soil and sediment, soil carbon, carbon cycle
In this talk, I focus on the interaction of organic C with minerals (e.g., aluminosilicate clays, hydrous iron oxides) and discuss the similarity and difference in their interaction between soil and sediment based on my own studies and the literature. I also discuss mechanistic reasons why OC is stabilized in mineral matrix in both systems. An emphasis is given to iron-C interaction due to their high reactivity and ecological importance in both terrestrial and aquatic systems. For instance, OC cycle is linked to N and P cycling as many organic compounds contain N and P. Iron can control P cycle due to strong sorption of phosphate to Fe oxides.
I plan to end my talk by emphasizing that basic understanding of soil formation and biogeochemistry would greatly help when tackling C and nutrient-related questions in river and coastal water.