Related Experiment Video
Updated: Jul 19, 2025
Isolation and Analysis of Microbial Communities in Soil, Rhizosphere, and Roots in Perennial Grass Experiments
Published on: July 24, 2018
Exposure to three herbicide mixtures influenced maize root-associated microbial community structure, function and the
Qingyun Ma1, Qingqing Li2, Jie Wang3
1State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, Hubei Province, 430070, PR China; State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, CAAS-CIAT Joint Laboratory in Advanced Technologies for Sustainable Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.
Herbicide mixtures used in maize fields alter soil microbes and enzymes, with mixtures persisting longer and impacting fungal communities more than single applications. This research aids in assessing agricultural sustainability.
Area of Science:
- Agricultural Science
- Environmental Science
- Microbiology
Background:
- Herbicide mixtures are crucial for managing weed resistance in maize fields.
- The ecotoxicological effects of these mixtures on soil microbial communities are not fully understood.
Purpose of the Study:
- To investigate the impact of nicosulfuron, mesotrione, and atrazine (alone and combined) on soil enzyme activity and microbial communities in maize root zones.
- To assess the persistence and ecological risks of herbicide mixtures.
Main Methods:
- Analysis of soil enzyme activities (dehydrogenase, urease, sucrose).
- Assessment of bacterial and fungal community structure and diversity (alpha and beta diversity).
- Quantification of residual herbicide concentrations and soil nitrogen content (NO3--N, NH4+-N).
Main Results:
- Herbicide mixtures showed longer persistence and degradation times than single herbicides.
- Rhizosphere microbial communities responded more intensely to herbicide stress.
- Enzyme activities were inhibited short-term; fungal richness increased with mixtures, while bacterial networks became less complex.
- Key microbial populations like Pseudomonas and Enterobacteriaceae were altered.
Conclusions:
- Herbicide mixtures significantly impact soil microbial community structure, function, and enzyme activities.
- Ecological niches, particularly the rhizosphere, are critical in mediating microbial responses to herbicides.
- Findings contribute to understanding the ecological risks of herbicide mixtures for agricultural sustainability.
