Regulation of straw-derived DOM and clay mineral complexation on mercury accumulation in vegetables
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View abstract on PubMed
Summary
This summary is machine-generated.Humified straw-derived dissolved organic matter (DOM) can suppress mercury (Hg) methylation in soil and reduce Hg accumulation in vegetables. Humified rape straw DOM complexed with montmorillonite showed the most significant Hg reduction.
Area Of Science
- Environmental Chemistry
- Soil Science
- Biogeochemistry
Background
- Straw return-to-field releases dissolved organic matter (DOM), influencing mercury (Hg) dynamics in soil-plant systems.
- Mechanisms of DOM-clay mineral interactions on Hg methylation and plant uptake are poorly understood.
Purpose Of The Study
- Investigate the impact of straw-derived DOM-montmorillonite (DOM-M) complexes on Hg methylation.
- Assess the accumulation of total Hg (THg) and methylmercury (MeHg) in vegetables.
- Differentiate the effects of DOM from rice straw (DOM<sub>rice</sub>) and rape straw (DOM<sub>rape</sub>).
Main Methods
- Synthesized DOM-montmorillonite (DOM-M) complexes using DOM from composted rice and rape straw.
- Analyzed MeHg levels in soil and water spinach.
- Quantified THg and MeHg accumulation in water spinach.
Main Results
- Straw-derived DOM increased soil and plant MeHg levels, but humified DOM suppressed this increase (29.0-64.5%).
- Humified DOM<sub>rice</sub>-M showed lower MeHg than humified DOM<sub>rape</sub>-M in soil and plants.
- Humified DOM<sub>rape</sub>-M significantly mitigated montmorillonite-enhanced MeHg accumulation in water spinach (25.8-52.0%).
Conclusions
- Humified straw-derived DOM, particularly from rape straw complexed with montmorillonite, is crucial for mitigating Hg methylation and plant uptake.
- Specific molecular components in DOM<sub>rape</sub>, like thiol-rich fractions, enhance Hg retention within mineral layers.
- Understanding DOM-mineral interactions is key to managing Hg dynamics in agricultural systems.
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