Figure 6
The RII of T. pretense, M. sativa and L. perenne to legume tree (R. pseudoacacia) in “R + T”.
(a) “R + M” (b) and “R + L” (c) planting patterns was affected by Pb stress levels and AMF inoculation. The blue solid line (
) represents the relationship between the RII of non-mycorrhizal plants and the Pb stress gradient; the blue dashed line (
) presents the relationship between the RII of mycorrhizal plants and the Pb stress gradient. Pb0, Pb500 and Pb1500 represent Pb concentration of 0, 500 and 1500 mg kg−1, respectively. The results are reported as the mean (n = 4) ± SD. Different letters indicate that significant differences were detected in the RII of neighbors to legume tree (R. pseudoacacia) in one planting pattern but at different Pb levels and AMF inoculation status by Duncan’s multiple-range tests (P < 0.05). Two-way ANOVAs were used to determine the significance of the effects of AMF inoculation (AMF), Pb level (Pb) and their interactions (AMF × Pb) on RII (**P < 0.01; *P < 0.05; ns, no significance).
