Effect of AMF diversity on ecosystem multifunctionality
Ecosystem multifunctionality under high AMF diversity was significantly greater than that under low AMF diversity (p < 0.001, Table 1, Figure 2), no matter under 0, 1, or 6 GCFs. Under the N addition treatment, ecosystem multifunctionality was highest in the absence of AMF, with no significant differences between low and high AMF diversity treatments. Under pesticide and saline-alkali treatments, no significant differences were observed ecosystem multifunctionality among the three AMF treatments. Under the control, microplastic, drought, and multiple GCFs treatments, ecosystem multifunctionality in high AMF diversity treatment was much higher than that in low AMF diversity treatment. The number of GCFs had a significant effect on ecosystem multifunctionality (p < 0.001, Table 1, Figure 2). Multiple GCFs significantly affected ecosystem multifunctionality under low AMF diversity, reducing it by 6.88% compared to a single GCF, while no AMF addition resulted in a 4.23% reduction. The smallest impact occurred with high AMF diversity, showing a 3.31% reduction compared to a single GCF. AMF diversity and the number of GCFs did not interactively affect ecosystem multifunctionality.