Assessing the Impacts of Cu(OH)(2) Nanopesticide and Ionic Copper on the Soil Enzyme Activity and Bacterial Community

文献类型： 外文期刊

第一作者： Zhang, Xiaoxia

作者： Zhang, Xiaoxia;Qian, Xiaoting;Li, Lingxiangyu;Kah, Melanie;Xu, Zhenlan;Lin, Daohui;Zeng, Tao;Filser, Juliane

作者机构：

关键词： nanopesticide; Cu(OH)(2); CuSO4; soil enzyme activity; soil bacterial community

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.279； 五年影响因子：5.269 ）

ISSN： 0021-8561

年卷期： 2020 年 68 卷 11 期

页码：

收录情况： SCI

摘要： Nanopesticides are being introduced in agriculture, and the associated environmental risks and benefits must be carefully assessed before their widespread agricultural applications. We investigated the impacts of a commercial Cu(OH)(2) nanopesticide formulation (NPF) at different agricultural application doses (e.g., 0.5, 5, and 50 mg of Cu kg(-1)) on enzyme activities and bacterial communities of loamy soil (organic matter content of 3.61%) over 21 days. Results were compared to its ionic analogue (i.e., CuSO4) and nano-Cu(OH)(2) including both the commercial unformulated active ingredient of NPF (AI-NPF) and synthesized Cu(OH)(2) nanorods (NR). There were negligible changes in the activity of acid phosphatase, regardless of exposure dose, whereas significant (p < 0.05) variations in activities of invertase, urease, and catalase were observed at a dose of 5 mg kg(-1) or higher. Invertase activity decreased with an increasing bioavailable Cu concentration in soil under various treatments. In comparison to CuSO4, both Cu(OH)(2) nanopesticide (i.e., NPF) and nano-Cu(OH)(2) (i.e., AI-NPF and NR) caused a significant (p < 0.05) inhibition of urease activity, wherein a significant (p < 0.05) increase in the activity of catalase was observed, representing serious oxidative stress. Accordingly, NPF, AI-NPF, and NR differently affected soil bacterial abundance, diversity, and community compared to CuSO4, which could have resulted from the changes in the bioavailable Cu concentration as a result of the distinct nature of copper spiked (i.e., nano form versus salt). Moreover, minor differences in the soil enzyme activity and bacterial community were observed between NPF and AI-NPF, reflecting that the impact of the Cu(OH)(2) nanopesticide was primarily attributed to the presence of nano-Cu(OH)(2). In total, the impacts of nano-Cu(OH)(2) on the soil bacterial community and enzyme activity tested in this study differed from CuSO4, shedding light on the environmental risks of the Cu(OH)(2) nanopesticide in the long run.

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