نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه علوم و مهندسی خاک، دانشکده مهندسی و فناوری کشاورزی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، تهران، ایران.
2 گروه مهندسی آبیاری و آبادانی، دانشکده مهندسی و فناوری کشاورزی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، تهران، ایران.
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
This study investigates the impact of biochar on greenhouse gas emissions, particularly CO₂ and N₂O. Biochar influences environmental cycles by altering the physical, chemical, and biological properties of soil. The results indicate that biochar produced from agricultural residues at 400°C achieved the highest reduction in CO₂ emissions (240 mg/kg); however, increasing the pyrolysis temperature to 600°C diminished its CO₂ reduction effect while increasing N₂O emissions to 45 mg/kg. Biochars with a high carbon-to-nitrogen (C:N) ratio, such as plant-derived biochars, were more effective in reducing CO₂ emissions, whereas biochars with a low C:N ratio, such as those derived from animal manure, increased N₂O emissions in moist soils. The feedstock type also played a crucial role, with peanut shell-derived biochar at high temperatures exhibiting the lowest CO₂ emissions, whereas swine manure biochar recorded the highest CO₂ (87 mg/kg) and N₂O (45 mg/kg) emissions. Particle size was another key factor; coarser biochars (5–10 mm), due to their greater stability and slower decomposition, reduced N₂O and CO₂ emissions by 41.7% and 39.4%, respectively, compared to finer biochars (0.5–2 mm). These effects were attributed to the biochar's chemical composition, porous structure, and its influence on soil microbial activity. Additionally, environmental factors such as moisture and temperature significantly affected biochar performance and gas emissions. Overall, selecting biochar with an optimal pyrolysis temperature, appropriate C:N ratio, stable feedstock, and suitable particle size can serve as an effective strategy for mitigating greenhouse gas emissions and enhancing soil quality.
کلیدواژه‌ها [English]
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