DISCUSSION
Through a two-factor greenhouse-controlled experiment, we demonstrated
that high AMF diversity increased ecosystem multifunctionality. When
subjected to multiple GCFs, ecosystem multifunctionality under high AMF
diversity was significantly higher than that under low AMF diversity and
any mono-AMF treatment, indicating complementarity among different AMF
species might help maintain ecosystem multifunctionality under the
increasing GCF numbers. In addition, the advantages of high AMF
diversity in promoting plant photosynthesis and biomass remained
consistent across all experimental conditions. This suggests that while
ecosystem multifunctionality may be influenced by an interplay of
factors, the positive impact of AMF diversity on plant productivity is
robust and enduring.