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以玉米为供试植物 ,研究了砂培条件下不同丛枝菌根真菌 (Acaulosporalaevis,Glomuscaledonium ,Glomusmanihotis)与不同浓度重金属 (铜和镉 )的相互作用对菌根侵染率、孢子数、根际微生物数量和磷酸酶活性的影响 .在不同浓度的铜和镉中 ,G .caledonium的侵染率均最高 ,且随重金属浓度的增加而变化较小 ,而它的孢子数在这 3种接种处理中最低 .低量的铜 (0 .0 5mg/kg)可显著地减少不接种、接种A .laevis和G .manihotis的细菌数量 ,却能显著地增加接种处理的真菌数量 .当溶液中铜的浓度大于 0 .2mg/kg时 ,接种处理的真菌数量小于不接种处理的真菌数量 .铜或镉的浓度不同时放线菌数量均有接种远大于不接种 ,其中接种之间放线菌数量相差不大 ,且随重金属浓度增大而变化较小 .无论是不同浓度的铜还是不同浓度的镉的接种处理常有利于增加磷酸酶活性 .重金属浓度低时 ,细菌和真菌数量、磷酸酶活性变化较大 ,高浓度时变化较小 .图 7参 15
Using maize as the tested plant, the effects of different arbuscular mycorrhizal fungi (Acaulosporalaevis, Glomuscaledonium, Glomusmanihotis) and different concentrations of heavy metals (copper and cadmium) on the mycorrhizal infection rate, number of spores, rhizosphere Microbial quantity and phosphatase activity in different concentrations of copper and cadmium, G. caledonium infection rate was the highest, and with the increase of heavy metal concentration changes little, and its spore number in these three kinds of inoculation (0. 05 mg / kg) significantly reduced the number of bacteria inoculated with A. laevis and G.manihotis, but significantly increased the number of inoculated fungi.When the content of copper When the concentration was more than 0.2mg / kg, the number of inoculated fungi was less than the number of non-inoculated fungi.When the concentration of copper or cadmium was not the number of actinomycetes were much greater than the number of inoculation, the number of actinomycetes between inoculation Is not large, and changes little with the increase of heavy metal concentration.Either the different concentrations of copper or different concentrations of cadmium inoculation often conducive to increase the activity of phosphatase.When the concentration of heavy metals is low, the number of bacteria and fungi The amount of phosphatase activity changes larger, small changes in high concentration