Diversities of AM fungi in the
rhizophere of
vegetables grown in sun-light greenhouses with different
replant years were investigated from 1999 to 2001.There were few AM fungus
spores distributed in the rhizopheric soil of vegetables. Three genera: Glomus, Acaulospora and Gigaspora, and 14 species (A. denticulata, G. clarum, A. mellea, A. elegan, G. versiforme, Gi. margatea etc) were isolated. Glomus and Acaulospora distributed widely, and the frequency and relative abundance were quite high in all of the soil samples. A. denticulata and G. clarum were dominant species, the frequency and relative abundance of the former were the highest, which showed its strong adaptation in this situation. Generally, the spore number and
colonization percentage of AM fungi in the rhizophere of tomato (Lycopersicom esculentum Mill.) and snapbean (Phaseolus vugaris L.) decreased as the replant years increased. In the same replant years, spore numbers in the rhizophere of tomato were higher than that of snapbean, but its colonization rate was lower than the latter. The influence of contents of available P and organic matter on
Diversities of AM fungi was analyzed. It was suggested that application with a great deal of chemical fertilizers, pesticides, and growth regulators for a long time inhibit growth of AM fungi, then further influence distribution characteristics and the diversity of AM fungi.
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