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Does increasing the organic fertilizer application rate always boost the antibiotic resistance level in agricultural soils?

文献类型： 外文期刊

作者： Guo, Yajie 1 ; Qiu, Tianlei 1 ; Gao, Min 1 ; Ru, Shuhua 2 ; Gao, Haoze 1 ; Wang, Xuming 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Biotechnol, Beijing Key Lab Agr Genet Resources & Biotechnol, Beijing 100097, Peoples R China

2.Hebei Acad Agr & Forestry Sci, Inst Agr Resources & Environm, Hebei Fertilizer Technol Innovat Ctr, Shijiazhuang 050051, Peoples R China

3.Beijing Acad Agr & Forestry Sci, Inst Biotechnol, 9 Shuguang Middle Rd, Beijing 100097, Peoples R China

关键词： Agricultural soil; Antibiotic resistance gene; Organic fertilizer; Fertilization rate; Bacterial diversity; Bacterial abundance

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.9； 五年影响因子：9.5 ）

ISSN： 0269-7491

年卷期： 2023 年 322 卷

页码：

收录情况： SCI

摘要： The amendment of organic fertilizer derived from livestock manure or biosolids is a significant driver of increasing antibiotic resistance in agricultural soils; however, it remains unclear whether increasing organic fertilizer application rates consistently enhances soil antibiotic resistance levels. Herein, we collected soils with long-term amendment with three types of organic fertilizers at four application rates (15, 30, 45, and 60 t/ha/y) and found that the higher the fertilization rate, the higher the antibiotic resistance gene (ARG) abundance. However, when the fertilization rate exceeded 45 t/ha/y, the ARG abundance ceased to significantly increase. Moreover, the soil ARG abundance was positively correlated with total nitrogen (TN) content and bacterial abundance, especially Firmicutes, and negatively affected by pH and bacterial diversity. Soil TN/bacterial abundance and pH/bacterial diversity reached maximum and minimum values at the 45 t/ha/y fertilization rate, respectively. Meanwhile, at this fertilization rate, Firmicutes enrichment peaked. Therefore, an organic fertil-ization rate of 45 t/ha/y appeared to represent the threshold for soil antibiotic resistance in this study. The underlying mechanism for this threshold was closely related to soil TN, pH, bacterial abundance, and diversity. Taken together, the findings of this study advance the current understanding regarding the soil resistome under different fertilization rates, while also providing novel insights into organic fertilizer management in agricultural practices.

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