Influences of Soil Factors on Robinia pseudoacacia and Hippophae rhamnoides AMF in Soft Rock Zone of Fugu Qingshuichuan Valley

The influence of soil factors on arbuscular mycorrhizal fungi in the rhizosphere of Robinia pseudoacacia and Hippophae rhamnoides in soft rock zone of Qingshuichuan valley of FuGu were studied by the analysis of correlation and the path analysis of correlation.The results showed that symbiotic relation was formed between AMF and the host plants.Thirteen AMF species were isolated and the average colonization rate of AMF was 90.6%.The average spore density was 559.1·100 g-1 soil and the colonization of AMF had no significant positive correlation with spore density and species.The colonization rate had significant positive correlation with pH in the rhizosphere of R.pseudoacacia and H.rhamnoides.In the rhizosphere of R.pseudoacacia,pH and available N influenced colonization rate directly;while available P and organic matter influenced colonization rate indirectly.In the rhizosphere of H.rhamnoides,pH and available P influenced colonization rate directly,organic matter and available N influenced colonization rate indirectly.In the rhizosphere of H.rhamnoides,pH and organic matter influenced species of AMF directly,available N influenced species of AMF indirectly.