铝胁迫对大豆根际土壤微生物区系的影响

通过盆栽试验研究了不同浓度外源铝对大豆根际土壤微生物区系的影响。结果表明:在低浓度下,铝对土壤细菌、放线菌具有刺激作用,在高浓度下,表现为抑制作用。铝对真菌的生长具有明显的刺激作用。在高浓度下,铝对土壤硝化细菌、反硝化细菌、自生固氮菌均产生强烈的抑制作用,最大抑制率分别为96%、98%和89%。土壤硝化细菌、反硝化细菌可以作为铝污染土壤生态环境的指示菌。铝对两个大豆品种根际土壤微生物区系组成的影响不一致,揭示铝胁迫的生物效应还与植物生长、植物根际效应有关。

Effects of Aluminium Stress on the Microflora in Soybean Rhizosphere Soil

The study dealt with the effect of aluminum(Al) stress on the microflora of rhizosphere soil by soybean pot culture experiment.The rhizosphere soil in the soybean pot culture experiment exhibited an increasing of bacteria and actinomycetes at low Al concentration and decreasing at high Al concentration.Al had significant stimulative effect on soil fungi.Al was significantly poisonous to soil nitrifier,dinitrifier and azotobacter at high concentration,and the maximum inhibition ratio reached 96%,98% and 89%,respectively.Nitrifier or denitrifier could be used as indicator bacteria of Al-polluted soil.The difference of effect of aluminium stress on rhizosphere microorganism between the two soybean varieties indicated that the biological effect of Al was related to plant growth and rhizospheric effect.