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Mercury accumulation response of rice plant (Oryza sativa L.) to elevated atmospheric mercury and carbon dioxide
- Source :
- Ecotoxicology and Environmental Safety, Vol 224, Iss, Pp 112628-(2021)
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- New observations and updated models now suggest terrestrial ecosystems are net sink of atmospheric mercury (Hg), and the critical constrained process to identify the strengths of terrestrial sink is whether the large amount of Hg stored in vegetation originates from the soil as well as from the atmosphere. In this study, field open top chambers (OTCs) experiments reveal that rice plant can assimilate gaseous elemental mercury (GEM, Hg0) from the atmosphere through stomata, and Hg concentrations in rice leaves, upper and bottom stalks and grains increased with Hg0 levels in air, showing significantly quadratic linear relationships. Coupling field stable isotope soil amendment experiments, atmospheric source of Hg in rice plant is quantified with more than 90% of Hg accumulation in rice aboveground biomass from air and approximately 80% of rice root Hg from soil. Furthermore, elevated atmospheric carbon dioxide (CO2) exposure led to lower Hg concentration in rice tissues through reduction stomatal conductance of rice leaf, and subsequently impact the capacity of Hg storage in rice aboveground parts from the atmosphere. The findings from experiments provide a foundation for future quantification of atmospheric sink of crops in local and larger scales and comprehensive evaluation atmosphere - terrestrial processes and exposure risks in the global Hg cycling.
- Subjects :
- Stomatal conductance
Health, Toxicology and Mutagenesis
chemistry.chemical_element
Rice tissues
Environmental pollution
Stable isotopic Hg soil amendment
Atmosphere
chemistry.chemical_compound
GE1-350
Carbon dioxide in Earth's atmosphere
Oryza sativa
Public Health, Environmental and Occupational Health
Elevated carbon dioxide
Mercury
General Medicine
Pollution
Mercury (element)
Environmental sciences
TD172-193.5
chemistry
Environmental chemistry
Carbon dioxide
Field open top chambers (OTCs)
Environmental science
Terrestrial ecosystem
Sink (computing)
Subjects
Details
- ISSN :
- 01476513
- Volume :
- 224
- Database :
- OpenAIRE
- Journal :
- Ecotoxicology and Environmental Safety
- Accession number :
- edsair.doi.dedup.....92655e6855f9764fa1f1fb2f4601b05b