不同AM菌株对酸性土壤玉米生长及磷营养的影响研究

试验研究不同AM菌株对酸性土壤玉米生长及P营养的影响结果表明,6种菌株的菌根形成、菌根效应、菌株根外菌物量均存在显著种间或生态型差异,华北菌株“BEG168”、法国菌株“BEG141”和华南菌株“BEG151”侵染率较高,达20%,而华北菌株“BEG167”次之,华中菌株“HAU-E4”和华南菌株“BEG150”最低。“BEG150”和“BEG168”显著促进玉米地上部和植株的生长,“BEG141”和“BEG151”则无促生效应,而“BEG167”和“HAU-E4”表现为负效应。除“BEG167”降低植物P素吸收外,其余菌株均对宿主P吸收有所增益,其中以“BEG168”和“BEG141”较高。除“BEG167”和“HAU-E4”外其他菌株均有一定应用价值,且以“BEG168”和“BEG150”最有望成为适应酸性土壤的高效真菌。

Effects of inoculation with different AM isolates on the maize growth and P uptake in acidic soil

The effects of inoculation with different AM isolates on the maize growth and P uptake in acidic soil were studied.The results show that there are significant differences among fungal species or ecotypes in mycorrhza formation,effectiveness and contribution to plant P uptake.About mycorrhiza formation,`BEG141'(isolated from France),`BEG168'(isolated from North China) and 'BEG151'(isolated from South China) have higher colonization rate of 20% and 'BEG167'(isolated from North China) follows,the 'HAU-E4'(isolated from Middle China) and 'BEG150'(isolated from South China) are the lowest.'BEG150' and 'BEG168' have markedly effect on the maize shoot biomass and plant growth,and no effect is performed by isolated 'BEG151' and 'BEG141',while 'BEG167' and 'HAU-E4' present a significant negative effect on the maize shoot biomass and plant growth.Except 'BEG167',all of the isolates are helpful to the P uptake,expecially 'BEG168' and 'BEG141'.In terms of function,apart form 'BEG167' and 'HAU-E4',all other isolates can be used in acidic soil,and 'BEG168' and 'BEG150' are the most promising isolates to be applied on acidic soil.