School of Resources and Civil Engineering, Northeastern University, No. 3-11, Wenhua Road, Heping District, Shenyang 110819, China.
Institute for Frontier Technologies of Low-Carbon Steelmaking, Northeastern University, No. 3-11, Wenhua Road, Heping District, Shenyang 110819, China.
Int J Environ Res Public Health. 2023 Jan 4;20(2):927. doi: 10.3390/ijerph20020927.
Biochar addition has been recommended as a potential strategy for mitigating climate change. However, the number of studies simultaneously investigating the effects of biochar addition on CO, NO and CH emissions and sequentially global warming potential (GWP) is limited, especially concerning its effect on native soil organic carbon (SOC) mineralization. An incubation experiment was conducted to investigate soil physicochemical properties, CO, NO and CH emissions and GWP in the treatments with 0% (CK), 1% (BC1) and 4% (BC4) cornstalk biochar additions, and clarify the priming effect of biochar on native SOC mineralization by the C tracer technique. Generally, biochar addition increased soil pH, cation exchange capacity, SOC and total nitrogen, but decreased NH-N and NO-N. Compared with CK, BC1 and BC4 significantly reduced CO emissions by 20.7% and 28.0%, and reduced NO emissions by 25.6% and 95.4%, respectively. However, BC1 significantly reduced CH emission by 43.6%, and BC4 increased CH emission by 19.3%. BC1 and BC4 significantly reduced the GWP by 20.8% and 29.3%, but there was no significant difference between them. Biochar addition had a negative priming effect on native SOC mineralization, which was the reason for the CO emission reduction. The negative priming effect of biochar was attributed to the physical protection of native SOC by promoting microaggregate formation and preferentially using soluble organic carbon in biochar. The NO emission decrease was rooted in the reduction of nitrification and denitrification substrates by promoting the microbial assimilation of inorganic nitrogen. The inconsistency of CH emissions was attributed to the different relative contributions of CH production and oxidation under different biochar addition ratios. Our study suggests that 1% should be a more reasonable biochar addition ratio for mitigating greenhouse gas emissions in sandy loam, and emphasizes that it is necessary to furtherly investigate nitrogen primary transformation rates and the relative contributions of CH production and oxidation by the N and C technique, which is helpful for comprehensively understanding the effect mechanisms of biochar addition on greenhouse gas emissions.
生物炭添加已被推荐为缓解气候变化的一种潜在策略。然而，同时研究生物炭添加对 CO、NO 和 CH 排放以及随后的全球变暖潜势（GWP）影响的研究数量有限，特别是关于其对原生土壤有机碳（SOC）矿化的影响。进行了一项培养实验，以研究在 0%（CK）、1%（BC1）和 4%（BC4）玉米秸秆生物炭添加处理下的土壤物理化学性质、CO、NO 和 CH 排放以及 GWP，并通过 C 示踪技术阐明生物炭对原生 SOC 矿化的激发效应。一般来说，生物炭添加增加了土壤 pH 值、阳离子交换容量、SOC 和总氮，但降低了 NH-N 和 NO-N。与 CK 相比，BC1 和 BC4 分别显著降低了 20.7%和 28.0%的 CO 排放，降低了 25.6%和 95.4%的 NO 排放。然而，BC1 显著降低了 43.6%的 CH 排放，BC4 增加了 19.3%的 CH 排放。BC1 和 BC4 分别显著降低了 20.8%和 29.3%的 GWP，但它们之间没有显著差异。生物炭添加对原生 SOC 矿化有负激发效应，这是 CO 排放减少的原因。生物炭的负激发效应归因于通过促进微团聚体形成和优先利用生物炭中的可溶性有机碳对原生 SOC 的物理保护。NO 排放减少的根源在于通过促进微生物对无机氮的同化来减少硝化和反硝化底物。CH 排放的不一致归因于不同生物炭添加比例下 CH 产生和氧化的相对贡献不同。我们的研究表明，在砂壤土中，1%的生物炭添加比例更有利于减少温室气体排放，并强调有必要进一步研究氮的初级转化速率和 C 和 N 技术的 CH 产生和氧化的相对贡献，这有助于全面理解生物炭添加对温室气体排放的影响机制。
Zotero 插件
