Effects of biochar addition on earthworm enhanced N2O emission

文献类型： 外文期刊

第一作者： Wu, Yupeng

作者： Wu, Yupeng;Jiang, Yanbin;Di, Hong;Liu, Juan;Lu, Yaoxiong;Shaaban, Muhammad

作者机构：

关键词： Biochar; Burrowing activity; Physicochemical properties; Drilosphere; Earthworm gut

期刊名称：EUROPEAN JOURNAL OF SOIL BIOLOGY （ 影响因子：3.3； 五年影响因子：4.1 ）

ISSN： 1164-5563

年卷期： 2024 年 123 卷

页码：

收录情况： SCI

摘要： The application of biochar has been shown to suppress soil nitrous oxide (N2O) emissions. Earthworms, a key component of soil fauna, are known to increase N2O production. While existing research has focused mainly on soil physicochemical management and microbial interactions, limited attention has been paid to how biochar interacts with soil fauna in relation to N2O emissions. To investigate this, an incubation experiment was conducted to analyze how various biochars, including corn straw (CS), rice straw (RS), wheat straw (WS), nutshell (NS), wood chip (WC), rice husk (RH), apricot shell (AS), and peach shell (PS) biochar, affect earthworm (Amynthas cortices) enhanced N2O emissions. Biochar addition reduced earthworm enhanced N2O production and decreased the cumulative earthworm burrowing length compared to control. Rice straw biochar was the most effective, releasing the lowest earthworm enhanced N2O emission at 73 mu g kg-1 soil and having the shortest cumulative burrowing length at 48.6 cm, whereas wood chip biochar had the least impact, with earthworm enhanced N2O reaching 307 mu g kg-1 soil. The drilosphere influenced by earthworms' activity demonstrated increased pH, C/N ratio, mineral nitrogen (MN), dissolved organic carbon (DOC), and microbial biomass carbon (MBC) compared to the bulk soil, though the extent of these changes varied with the type of biochar applied. The biochar addition altered the micro-environment within the earthworm gut, including O2 concentration and pH levels, thereby affecting the N2O related microbial community in the drilosphere. This was evidenced by changes in the ratio of nirK + nirS to nosZ genes and the abundance of ammonia-oxidizing archaea and bacteria gene copies. Hierarchical partitioning analysis revealed that the biochar's properties primarily influenced earthworm burrowing activity, the dominant factor affecting earthworm enhanced N2O emissions, followed by MN, DOC, and MBC content in the drilosphere. The impact of gut-derived microbes on N2O emissions was comparatively insignificant. These findings highlight that biochar amendment can mitigate earthworm induced N2O emissions, primarily by modifying earthworm activity, which is strongly influenced by the biochar's physicochemical characteristics.

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