Key Laboratory for New Technology Research of Vegetable, Vegetable Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; Faculty of Food Science and Engineering, Foshan University, Foshan 258000, China.
School of Agriculture, Sun Yat-sen University, Shenzhen 518107, China.
Sci Total Environ. 2024 Mar 20;917:170293. doi: 10.1016/j.scitotenv.2024.170293. Epub 2024 Jan 28.
Biochar was popularly used for reducing greenhouse gas (GHG) emissions in vegetable production, but using biochar does not necessarily guarantee a reduction in GHG emissions. Herein, it's meaningful to elucidate the intricate interplay among biochar properties, soil characteristics, and GHG emissions in vegetable production to provide valuable insights for informed and effective mitigation strategies. Therefore, in current research, a meta-analysis of 43 publications was employed to address these issues. The boost-regression analysis results indicated that the performance of biochar in inhibiting NO emissions was most affected by the N application rate both in high and low N application conditions. Besides, biochar had dual roles and showed well performance in reducing GHG emissions under low N input (≤300 kg N ha), while having the opposite effect during high N input (>300 kg N ha). Specifically, applying biochar under low N fertilization input could obviously reduce soil NO emissions, CO emissions, and CH emissions by 18.7 %, 17.9 %, and 16.9 %, respectively. However, the biochar application under high N fertilization input significantly (P < 0.05) increased soil NO emissions, CO emissions, and CH emissions by 39.7 %, 43.0 %, and 27.7 %, respectively. Except for the N application rate, the soil pH, SOC, biochar C/N ratio, biochar pH, and biochar pyrolysis temperature are also the key factors affecting the control of GHG emissions in biochar-amended soils. The findings of this study will contribute to deeper insights into the potential application of biochar in regulating GHG under consideration of N input, offering scientific evidence and guidance for sustainable agriculture management.
生物炭在减少蔬菜生产中的温室气体（GHG）排放方面得到了广泛应用，但使用生物炭并不一定能保证 GHG 排放的减少。因此，阐明生物炭特性、土壤特性和蔬菜生产中 GHG 排放之间的复杂相互作用，对于提供明智有效的减排策略具有重要意义。因此，在当前的研究中，采用荟萃分析对 43 篇文献进行了分析。回归分析结果表明，在高氮和低氮条件下，生物炭抑制 NO 排放的性能主要受施氮量的影响。此外，生物炭具有双重作用，在低氮输入（≤300kgN/ha）下表现出良好的减排效果，而在高氮输入（>300kgN/ha）下则相反。具体来说，在低氮施肥条件下施加生物炭可明显降低土壤 NO 排放、CO 排放和 CH 排放分别为 18.7%、17.9%和 16.9%。然而，在高氮施肥条件下施加生物炭会显著（P<0.05）增加土壤 NO 排放、CO 排放和 CH 排放分别为 39.7%、43.0%和 27.7%。除施氮量外，土壤 pH 值、SOC、生物炭 C/N 比、生物炭 pH 值和生物炭热解温度也是影响生物炭改良土壤中 GHG 排放控制的关键因素。本研究的结果将有助于更深入地了解在考虑氮输入的情况下生物炭在调节 GHG 方面的潜在应用，为可持续农业管理提供科学依据和指导。
