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Rare earth elements sequestration in phytoliths: Partitioning patterns and influencing mechanism
Bing Wang1, Yangzheng Liu2, Zihao Wang3
1Forestry College, Inner Mongolia Agricultural University, Hohhot 010019, China; Forest Ecosystem National Observation and Research Station of Greater Khingan Mountains in Inner Mongolia, Genhe 022350, China.
Phytoliths (plant silica bodies) accumulate rare earth elements (REEs) in soils, with concentrations varying by altitude. Climate significantly influences REE uptake and storage in phytoliths, impacting terrestrial REE cycling.
Area of Science:
- Environmental Science
- Geochemistry
- Biogeochemistry
Background:
- Rare earth elements (REEs) are critical for high-tech applications.
- The role of phytoliths in REE biogeochemical cycling is underestimated.
- Understanding REE sequestration in terrestrial ecosystems is crucial.
Purpose of the Study:
- To investigate the accumulation of REEs in phytoliths (PhytREEs) in the Greater Khingan Mountains.
- To quantify PhytREEs content in surface soils using optimized methods.
- To determine factors influencing REE partitioning into phytoliths.
Main Methods:
- Optimized wet oxidation method for sample preparation.
- Heavy liquid flotation for phytolith separation.
- Multivariate analysis to assess influencing factors.
Main Results:
- PhytREEs concentration showed an elevation-dependent pattern, decreasing towards the east.
- Enrichment coefficient (ECPhytREEs) indicated moderate selective sequestration (~2.7%).
- Climate, terrain, soil texture, and organic matter influenced REE uptake and phytolith storage.
Conclusions:
- Complexation with organic matter is a key mechanism for REE immobilization in phytoliths.
- Climate emerges as the predominant factor controlling PhytREE storage and bioavailability.
- Phytoliths should be integrated into models of terrestrial REE cycling.
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