苯磺隆和2,4-D胁迫对土壤微生物影响的研究

Studies on the Effect of Tribenuron-Methyl and 2,4-D on Soil Microorganisms

以盆栽试验研究了除草剂苯磺隆、2,4-D对石灰性褐土中土壤微生物群落的影响。结果表明,在供试浓度下,土壤微生物对两种除草剂的感应存在一定的差异性。苯磺隆高浓度处理在最初3d极显著地抑制细菌生长,之后对土壤细菌具有刺激作用,特别是培养结束时激活率还高达917.6%,低浓度处理呈极显著的刺激作用;苯磺隆对土壤放线菌具有显著的刺激作用,对土壤真菌有强烈的抑制作用,最高抑制率达100%,到培养结束时(60d)真菌数量还未恢复到对照水平。2,4-D处理对土壤放线菌具有明显的抑制、激活的波动性,对土壤细菌、真菌有强烈的抑制作用。

The effect of tribenuron-methyl and 2,4-D on the population of soil microorganisms was studied in lime soil by potted plant. Results showed that the reaction of soil microorganisms to these two herbicides was different. High concentration of tribenuron-methyl inhibited bacteria＇s growth significantly in the first 3 days, then it stimulateed their growth, especially towards the end of cultivation, the activity ratio increased to 917.6%, and low concentration of tribenuron-methyl also stimulated bacteria＇s growth significantly. Tribenuron-methyl stimulated actinomyces growth and inhibits fungi remarkably, with the maximum inhibition ratio of 100%, and the quantity of fungi failed to fall back to that of the control at the end of cultivation. The effect of 2,4-D on actinomyces remained changing between inhibition to activation, while on fungi and bacteria it was significant.