The effects and underlying mechanisms of modified biochar combined with nitrification inhibitors on nitrous oxide mitigation in acidic soils
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View abstract on PubMed
Summary
This summary is machine-generated.Alkali-modified biochar (B2) combined with DMPP significantly reduced nitrous oxide (N₂O) emissions in acidic soils. This synergy enhances N₂O reduction and lowers nitrification, offering an effective mitigation strategy.
Area Of Science
- Environmental Science
- Soil Science
- Agricultural Science
Background
- Acidic soils are significant sources of nitrous oxide (N₂O), a potent greenhouse gas.
- Effective N₂O mitigation strategies for these soils are limited.
- Biochar and modified biochar show potential for N₂O emission reduction.
Purpose Of The Study
- To investigate the effects of pristine biochar (B1), alkali-modified biochar (B2), and polyethylenimine-alkali-modified biochar (B3) on N₂O emissions in acidic soils.
- To evaluate the synergistic potential of these biochar types with the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP).
Main Methods
- Application of B1, B2, and B3 alone and in combination with DMPP to acidic soil.
- Measurement of N₂O emissions.
- Analysis of microbial communities (N₂O-reducing microbes, nosZ gene abundance) and key functional genes (amoA).
Main Results
- B2 significantly decreased N₂O emissions by 38.9%, outperforming B1.
- B3 significantly increased N₂O emissions by 119.5%.
- A synergistic N₂O mitigation effect of 59.6% was observed with the B2-DMPP combination, attributed to enhanced N₂O reduction and suppressed nitrification.
Conclusions
- Alkali modification enhances biochar's efficacy in mitigating N₂O emissions.
- The combination of B2 and DMPP offers a highly effective strategy for N₂O mitigation in acidic soils.
- Soil properties like pH and organic carbon content influence the synergistic or antagonistic effects of biochar-DMPP combinations.
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