Effects Of Soil Factors On Arbuscular Mycorrhizal Fungi Of The Invasive Plant-Flaveria Bidentis

As a typically invasive plant, Flaveria bidentis has spread in Hebei province and Tianjincity in the recent years and seriously threat to the local ecological environment. At present,the research about invasion mechanism of F. bidentis was less. In order to explore therelationship of soil environment and invasive plants-Flaveria bidentis. Three samples ofFlaveria bidentis were collected in Xian county of Hebei province. This paper studied thechanges of soil factors and ecological distribution of AM fungi after invasion, so as to providethe theory basis to control and prevent F. bidentis spread. Main results were showed asfollows:1.28kinds of AM fungal species belonging to4genera were isolated from soil samples.Of them, there were7to Acaulospora,15to the Glomus,4to Scutellospore and2toGigaspora.2.AM fungi can form well symbionts with Flaveria bidentis. The average totalcolonization is up to63.18%, and the average spore density reach13.07/g soil, and formed theintermediate type mycorrhizas.3.The temporal and spatial distribution of AM fungi have a significant change. Sporedensity, total colonization and colonization strength of AM fungi in October were higher thanthat in May; The biggest spores density and colonization were all appearred in ChenZhuang.4.AM fungal distribution were closely related to soil factors. Soil pH was the main factorto distribution of AM fungi. Both phosphatase and available N in soil samples showed anegative correlation with spore density and vesicular colonization; hyphal colonization waspositively correlated with soil organic carbon, available P, TEG and EEG.5.Compared with the blank, the content of soil organic carbon, phosphatase, EEG andTEG were down in samples. The dominant species in vacancy was G.melanosporum, and theplots are G.claroideum and G.melanosporum, with the species increased. The existence of AM fungi in the rhizosphere of Flaveria bidentis maybe impove the capacity of drought andsalinization resisting.6.The content of TEG and EEG in the Chenzhuang was maximal, and Monan minimum;TEG and EEG accounted for5.34%and4.59%of soil organic matter, and October was higherthan May.