咪草烟污染土壤的微生物修复特性研究

Bioremediation of imazethapyr contaminated soil with QC-13 was studied under laboratory conditions. Addition of QC-13 could prominently accelerate the degrading of imazethapyr in soil. When the concentration of imazethapyr was 50mgokg-1, the inoculation of QC-13 was 108 CFUog-1, degradation rate was 66.2% after 21 days, whereas the rate was only 14.4% in control group. Degradation rate was related positively to the amount of inoculation. When the inoculation of QC-13 was 105 CFUog-1, the degradation rate was 31.8%. Low concentration of imazethapyr in soil was easily for QC-13 to degrade. When the concentration of imazethapyr increased to 100 mgokg-1, imazethapyr degradation rate was only 38.7%. Soil temperature and moisture also affected imazethapyr degradation rate. When it was 30℃, the rate reached 62.7% in 21 days. When soil moisture was 40%, imazethapyr degradation rate was 62.2%, whereas when soil moisture was 50%, the rate decreased to 25.2%.