Development status of Arbuscular mycorrhizal fungi associated with invasive plant Coreopsis grandiflora Hogg.

According to the distribution of Coreopsis grandiflora Hogg., samples were collected from two natural invasion sites; Jufeng and Beijiushui and cultivated site to research AM fungal arbuscule structure of C. grandiflora Hogg., colonization status in different sample plots and altitudes, and the correlation between colonization status and soil factors in the rhizosphere of C. grandiflora. The result showed that C. grandiflora could form heavy Paris-type arbuscule structure, Beijiushui mycorrhizal colonization percentage and numbers of entry points was highest and significant differences with Jufeng and campus. C. grandiflora Hogg. mycorrhizal colonization percentage was on the rise with rising altitudes. In addition to altitudes, soil factors as well as to influence AM fungal colonization status, there were very positive correlation (r=0.792) and positive correlation (r=0.725) between mycorrhizal colonization percentage and the content of organic carbon, available potassium in soil, respectively; there were very positive correlation (r=0.854) and very negative correlation (r=-0.966) between numbers of vesicles P-type arbuscule) and the content of available potassium, pH in soil; there were negative correlation (r=-0.782) between numbers of entry points and the content of available phosphorus. High infection rate and the formation of typical arbuscular form of C. grandiflora Hogg. at Laoshan should have an important role on the process from the invasion to becoming constructive species.