草甘膦对土壤微生物能量代谢的影响

Effect of Glyphosate on Energy Metabolism of Soil Microorganisms

草甘膦是应用最广、产量最大的农药除草剂,草甘膦对土壤微生物能量代谢的影响受到越来越多研究者的关注。以壤质潮土和黑土为供试土壤,采用微量量热法研究了草甘膦对土壤微生物能量代谢的影响。结果表明,草甘膦对两类土壤微生物能量代谢均有不同程度的抑制作用,黑土微生物对草甘膦的耐受性更强;草甘膦对壤质潮土和黑土微生物代谢活性的半数抑制浓度分别为444.90mg·kg-1、978.69mg·kg-1;土壤微生物的能量代谢与土壤的理化性质显著相关。

Glyphosate is a widely used and mass produced herbicide.The effect of glyphosate on the energy metabolism of soil microorganisms has attracted concerns from more and more researchers.Using medium loam soil and black soil as tested samples,the effects of glyphosate on the energy metabolism of microorganisms were studied by microcalorimetry.Results showed that,glyphosate had inhibitory effects on both two kinds of soil in varying degrees.Stronger microbial resistance and tolerance to glyphosate was observed in black soil.Half inhibitory concentrations（IC50）of glyphosate for metabolism activity of soil microorganisms on medium loam soil and black soil were 444.90mg·kg-1 and 978.69mg·kg-1,respectively.The energy metabolism of soil microorganisms was significantly related to the physicochemical properties of the soil.