Influence of arbuscular mycorrhizal fungi on the competition between Eupatorium adenophorum and Artemisia annua in different competitive states.

In order to study the effect of interspecific competition on invasive plant Eupatorium adenophorum and indigenous plant Artemisia annua inoculated with arbuscular mycorrhizal fungi,Eupatorium adenophorum and Artemisia annua inoculated with AMF or uninoculated were cultivated in three different competitive states of monoculture,nylon mesh split and mix cropping in karst limestone soil.The biomass and phosphorus uptake of the two species were measured and relative competitive strength of the two species were evaluated.The results showed that:Two species growth and P uptake was improved compared with the non-inoculated treatment in three different competitive state;With the strengthen of plant inter-specific competition,the mycorrhizal dependency of E.adenophorum was suppressed compared with monoculture treatment in the pattern of nylon mesh split and mix cropping,but A.annua was improved,The biomass and phosphorus uptake of E.adenophorumvaried in similarity law.Analyzing the competition index,inoculation with AMF could decreased the competitiveness of E.adenophorum,and improved the competitiveness of A.annua.The inoculation with AMF has weakened the competitiveness of invasion plants on the competition between invasive plants and aboriginal plants,AMF played an important role in decreasing Eupatorium adenophoruminvasion and maintaining ecological security and environmental safety in the ecosystems.