Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Sci Total Environ. 2021 Feb 25;757:143807. doi: 10.1016/j.scitotenv.2020.143807. Epub 2020 Nov 26.
With the expanding nanotechnology, nanoparticles (NPs) embedded products are used in the agricultural sector to improve soil fertility. Thus, two typical metal oxides NPs and their mixtures were applied in different doses to evaluate the impacts on soil microbes. CuO and ZnO NPs boosted soil microbial communities as reflected by the increased number of extractable bacterial or fungal groups and the enlarged values of Chao 1, ACE, and Shannon indices. Relative abundance of some susceptible taxa such as Sphingomonadales increased with increasing concentrations of ZnO NPs, while IMCC26256 decreased with increasing concentrations of CuO NPs. The mixture of CuO and ZnO NPs did not show more promotional effects on the soil bacterial community than the sum of individual effects. Increased soil organic carbon mitigated the impacts on soil bacteria for CuO NPs, but not for ZnO NPs. As micro-nutrients, the ions released from CuO and ZnO NPs had the potential to promote soil microbial community richness and diversity. However, the positive impacts of MNPs were impaired at dosage higher than 250 mg kg soil (213.08 mg kg soil of Cu, 162.73 mg kg soil of Zn). Thus, the application dose and soil type other than the coexistence of MNPs should be considered before the wide use in increasing agricultural productivity.
随着纳米技术的不断发展，纳米颗粒（NPs）嵌入产品被应用于农业领域以提高土壤肥力。因此，我们将两种典型的金属氧化物 NPs 及其混合物应用于不同剂量，以评估其对土壤微生物的影响。CuO 和 ZnO NPs 促进了土壤微生物群落的发展，这反映在可提取细菌或真菌类群的数量增加和 Chao1、ACE 和 Shannon 指数的值增大。一些易受影响的类群（如鞘氨醇单胞菌目）的相对丰度随着 ZnO NPs 浓度的增加而增加，而随着 CuO NPs 浓度的增加，IMCC26256 的相对丰度则减少。CuO 和 ZnO NPs 的混合物对土壤细菌群落的促进作用并不比单个 NPs 的总和更显著。增加的土壤有机碳减轻了 CuO NPs 对土壤细菌的影响，但对 ZnO NPs 没有影响。作为微量营养素，CuO 和 ZnO NPs 释放的离子有可能促进土壤微生物群落的丰富度和多样性。然而，在高于 250mg/kg 土壤的剂量下（213.08mg/kg 土壤的 Cu 和 162.73mg/kg 土壤的 Zn），MNPs 的积极影响受到了损害。因此，在将其广泛应用于提高农业生产力之前，应该考虑应用剂量和土壤类型，而不仅仅是 MNPs 的共存。
