The impact of biochar addition on the carbon footprint of grain crop: A life cycle assessment of biochar management

文献类型： 外文期刊

第一作者： Han, Mengxue

作者： Han, Mengxue;Hui, Xin;Han, Mengxue;Yang, HuiMin;Chen, Yifei

作者机构：

关键词： Biochar addition; Carbon footprint; Meta-analysis; Lifecycle calculation

期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.5； 五年影响因子：5.9 ）

ISSN： 1161-0301

年卷期： 2025 年 170 卷

页码：

收录情况： SCI

摘要： In the context of global climate change, biochar application is recognized as a strategy to enhance carbon neutrality in agriculture. However, previous studies often overlook the carbon footprint associated with biochar management. This study integrates meta-analysis and life cycle assessment (LCA) to evaluate the impact of biochar addition on the carbon footprint of maize, wheat, and rice production systems, explicitly accounting for agricultural inputs, biochar management, and field processes. Our results reveal that biochar application significantly reduces N2O and CH4 emissions across all crops, with optimal suppression observed at 20-50 t ha-1 . However, CO2 emissions displayed a quadratic response, minimized at 5-10 t ha-1 . Biochar increased soil organic carbon (SOC) by 35.03 % (maize), 37.36 % (wheat), and 54.76 % (rice), and enhanced plant biomass by 15.22 %, 14.72 %, and 7.06 %, respectively. Critically, LCA demonstrated that biochar management contributes 1.37-16.30 % of the total carbon footprint, with transportation and pyrolysis dominating emissions. Balancing carbon sequestration and environmental costs, the optimal application rates were identified as 5-10 t ha-1 for maize and <= 5 t ha-1 for wheat and rice. Pyrolysis temperatures of 350-450 degrees C maximized carbon benefits for maize, while 450-550 degrees C was optimal for wheat and rice. This study provides actionable guidelines for biochar deployment, emphasizing crop-specific strategies to achieve sustainable agricultural carbon mitigation.

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