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| Study on the degradation effect of rice husk biochar loaded with Stenotrophomonas maltophilia on triazolone in cucumber planting soil |
| Received:February 26, 2025 |
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| KeyWord:triazolone;rice husk biochar;biodegradation;biochar immobilization technology;soil physicochemical properties;microbial community |
| Author Name | Affiliation | E-mail | | WU Zongbin | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LIU Zengxue | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | YUE Xingyu | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | ZHANG Sai | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LI Tingting | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | XU Wenyuan | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | SHI Yanhong | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | shiyh@ahau.edu.cn |
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| Abstract: |
| In this study, the remediation efficacy of SM3（Stenotrophomonas maltophilia） on triazolone-contaminated soil and its mechanism of action were systematically evaluated by immobilizing SM3 through rice husk biochar. A one-factor optimization experiment was used to determine the optimal degradation conditions：initial pollutant concentration of 20 mg·kg-1, dosage of 5%（m/m）, soil moisture content of 66%, ambient temperature of 30℃, and pH 8.0. Under these conditions, the triazolone degradation rate of the treatment group （SMDP）reached 79.14%, which was 54.9 percentage points higher than that of the natural attenuation group. data from the 21-day incubation cycle showed that the SMDP treatment significantly improved soil physicochemical properties：pH recovered to 7.72±0.03（close to 7.76 in the original soil）; quick-acting potassium increased to 244.11 mg·kg-1（+1.71%）; effective phosphorus stabilized at 8.21-9.35 mg·kg-1（+37.62%）; nitrate nitrogen decreased to 0.57 mg·kg-1（-14.92%）; and ammonia nitrogen increased to 13.47 mg·kg-1（+1.28%）. 16S rRNA sequencing analysis indicated that the treatment simultaneously induced significant succession of key bacterial groups such as Ascomycetes phylum（relative abundance increased by 39.78%）, and that rice husk biochar loaded with SM3 additions affects the structural composition of bacterial community phylum in soil. |
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