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- Title
纳米银对土壤固氮微生物群落结构及固氮活性的影响.
- Authors
伍玲丽; 杨玉蓉; 张丽; 刘小红; 司友斌
- Abstract
To evaluate the possible risks of silver nanoparticles(AgNP)in soil environments, culture experiments were carried out to study the effects of 10 nm(10, 25, and 50 mg·kg-1)and 50 nm(25, 50, and 100 mg·kg-1)AgNP on nitrogenase activity and the quantity and community structure of nitrogen-fixing microorganisms. The results showed that the number of nitrogen-fixing microorganisms declined; the relative abundance of Bradyrhizobiu, Pseudomona, Vulgatibacter, and Anaeromyxobacter decreased. In contrast, the relative abundance of Azoarcus increased in the AgNP-treated soils. In addition, the community structure of nitrogen-fixing microorganisms changed significantly upon exposure to AgNP in soil. The largest impact of soil AgNP on the structure of the nitrogen-fixing microbial community was seen for 10 nm AgNP applied for 7 days, while the smallest effect was seen for 50 nm AgNP applied for 90 days. The number of Azotobacter decreased by 18.96%~47.28% and 17.42%~27.78% after 28 days of soil exposure with different doses of 10 nm and 50 nm AgNP, respectively. Nitrogenase activity also decreased with exposure time, and by 14.55%~27.47% and 17.87%~21.79% after 90 days of soil exposure with different doses of 10 nm and 50 nm AgNP, respectively. In conclusion, AgNP have negative effects on soil nitrogen fixing microorganisms and nitrogenase activity, which are related to the AgNP size, dose, and exposure time.
- Subjects
NITROGEN-fixing microorganisms; NITROGENASES; SILVER nanoparticles; SOIL structure; EXPOSURE dose; SOIL microbial ecology; FERTILIZERS; NITROGEN fixation
- Publication
Journal of Agro-Environment Science, 2019, Vol 38, Issue 12, p2757
- ISSN
1672-2043
- Publication type
Article
- DOI
10.11654/jaes.2019-0803