数字农科院2.0

Effects of biochar on soil N2O emissions, aggregate stability and nutrients under subsoiling and rotary tillage in wheat-maize rotation systems

文献类型： 外文期刊

作者： Huang, Chao;Chen, Haiqing;Liu, Xuchen;Ma, Shoutian;Li, Ying;Zhang, Zhao;Tang, Hejing;Wang, Xingpeng;Liu, Zhandong

作者机构：

关键词： Wheat-maize rotation system;Biochar;Soil N2O emissions;Soil aggregate stability;Soil nutrients;Subsoiling tillage

期刊名称： JOURNAL OF AGRICULTURE AND FOOD RESEARCH

ISSN： 2666-1543

年卷期： 2025 年 23 卷

页码：

收录情况： ESCI（2025版）

摘要： Long-term use of a single tillage method degrades soil texture and organic matter, reducing productivity. Therefore, improving soil organic matter and optimizing tillage are vital for sustainable productivity on the North China Plain. The study focused on two factors: tillage method and biochar application. The tillage methods included subsoiling (ST) and conventional rotary tillage (RT), while the biochar application rates were 0 t/hm(2) (B0), 4.5 t/hm(2) (B1), and 9.0 t/hm(2) (B2), with biochar applied before wheat sowing. According to the results, biochar significantly reduced N2O emissions by 19.6 %-29.5 % over the wheat-maize rotation. Compared to rotary tillage, subsoiling enhanced soil total nitrogen, organic matter (SOM) in the 0-20 cm layer by 9.0 %. Biochar significantly increased SOM, microbial biomass carbon (MBC), and microbial biomass nitrogen (MBN) in the top 20 cm, with greater effects under subsoiling; in the STB2 treatment, increases were 15.5 %, 17.1 %, and 17.1 %, respectively. Biochar also increased soil pH and reduced bulk density, with stronger effects at higher rates. Although biochar exerted no significant effect on the non-water-stable aggregates stability, it did considerably increase the fraction of >5 mm non-water-stable aggregates and stability. The improvement in aggregate stability was only observed in the surface soil after the second crop, where biochar increased the mean weight diameter, geometric mean diameter and water-stable aggregates, while reducing soil erodibility factor (K-factor) and percentage of soil aggregate destruction. Improvements in deeper layers were minimal. Comprehensive evaluation indicated that subsoiling plus 4.5 t/hm(2) biochar showed better nutrient and aggregate stability improvement than 9.0 t/hm(2) biochar with rotary tillage. In summary, subsoiling with 4.5 t/hm(2) biochar enhances soil quality and reduces greenhouse gas emissions, with cumulative benefits over time.

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