CAJ | 학술논문

研究了根际和非根际土壤中除草剂丁草胺的降解.结果表明,棉花、水稻、小麦和玉米的种植明显促进丁草胺的降解,15 mg/kg丁草胺的降解半衰期缩短26.6%～57.2%,这种促进作用与作物种类有关,玉米、小麦、水稻、棉花依次增强.50 mg/kg丁草胺的降解有所受抑制,但作物种植仍显示良好的促进作用.作物根际丁草胺降解菌的测定结果显示,根际土壤中丁草胺降解菌的数量大于非根际土壤,作物种植对丁草胺降解的促进作用源于根际丰富的降解菌.
연구료근제화비근제토양중제초제정초알적강해.결과표명,면화、수도、소맥화옥미적충식명현촉진정초알적강해,15 mg/kg정초알적강해반쇠기축단26.6%～57.2%,저충촉진작용여작물충류유관,옥미、소맥、수도、면화의차증강.50 mg/kg정초알적강해유소수억제,단작물충식잉현시량호적촉진작용.작물근제정초알강해균적측정결과현시,근제토양중정초알강해균적수량대우비근제토양,작물충식대정초알강해적촉진작용원우근제봉부적강해균.
Plant rhizosphere provides a favorable micro-ecosystem for the proliferation of soil microorganisms and therefore vegetation can promote actively microbial degradation of organic chemicals in soil. The degradation of herbicide butachlor in nonrhizosphere soil and in rhizosphere soils after vegetation of crop plants was studied. The results showed that the degradation rate of butachlor in soil was accelerated markedly after vegetation of cotton, rice, wheat, and corn plant, and the half-lives of butachlor, at concentration of 15 mg/kg, in these rhizosphere soils, were shorten by 26.6% to 57.2%, respectively, compared to those in nonrhizosphere soil. The enhancement of the degradation activity increased with species of crop plant in the order of corn, wheat, rice and cotton. Although butachlor at high concentration (50 mg/kg) showed some degree of inhibition, the degradation was also enhanced by vegetation of the crop plants. Measurement of the growth of butachlor degraders during the degradation experiment period indicated that the number of butachlor degraders in rhizosphere soils was larger than that in nonrhizosphere soil. Our results suggest that vegetation of a certain crop plants may accelerate removal of residual herbicides and avoid residual toxicity to crops.