摘要
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 m g/kg丁草胺的降解半衰期缩短 2 6 .6 %～ 5 7.2 % ,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。 5 0 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。
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.
出处
《农药学学报》
CAS
CSCD
2004年第1期46-52,共7页
Chinese Journal of Pesticide Science
基金
National Natural Science Foundation of China(Project No. 30 2 70 880
30 2 30 2 5 0
2 0 3770 36 )
973project(No. 2 0 0 2 CB4 10 80 6 )
the Natural Science Foundation of Zhejiang(No. 30 15 0 1)
Sci&TechnolFoundationofHangzhou (2 0 0 2 112 A 0 8) .
关键词
生物降解
作物
生物修复
丁草胺
根际土壤
biodegradation
crop
bioremediation
butachlor
rhizosphere soil
