N2O and NO production and functional microbes responding to biochar aging process in an intensified vegetable soil

文献类型： 外文期刊

第一作者： Zhang, Xi

作者： Zhang, Xi;Zhang, Junqian;Song, Mengxin;Dong, Yubing;Xiong, Zhengqin;Dong, Yubing

作者机构：

关键词： Vegetable soil; Aged biochar; Nitrous oxide; Nitric oxide; Gene abundance

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：9.988； 五年影响因子：10.366 ）

ISSN： 0269-7491

年卷期： 2022 年 307 卷

页码：

收录情况： SCI

摘要： Vegetable soils with high nitrogen input are hotspots of nitrous oxide (N2O) and nitric oxide (NO), and biochar amended to soil has been documented to effectively decrease N2O and NO emissions. However, the aging effects of biochar on soil N2O and NO production and the relevant mechanisms are not thoroughly understood. A(15)N tracing microcosm study was conducted to clarify the responses of N2O and NO production pathways to the biochar aging process in vegetable soil. The results showed that autotrophic nitrification was the predominant source of N2O production. Biochar aging increased the O-containing functional groups while lowering the aromaticity and pore size. Fresh biochar enhanced the AOB-amoA gene abundance and obviously stimulated N2O production by 15.5% via autotrophic nitrification and denitrification. In contrast, field-aged biochar markedly weakened autotrophic nitrification and denitrification and thus decreased N2O production by 17.0%, as evidenced by the change in AOB-amoA and nosZI gene abundances. However, the amendment with artificially labaged biochar had no effect on N2O production. With the extension of aging time, biochar application reduced the soil NO production dominated by nitrification. Changes in the N2O and NO fluxes were closely associated with soil NH4+-N and NO2--N contents, indicating that autotrophic nitrification played a critical role in NO production. Overall, our study demonstrated that field-aged biochar suppressed N2O production via autotrophic nitrification and denitrification by regulating associated functional genes, but not for lab-aged biochar or fresh biochar. These findings improved our insights regarding the implications of biochar aging on N2O and NO mitigation in vegetable soils.

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