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Concentration of PCB homolog groups in different soil layers of AMF-inoculated treatments and the control after 40 days of Cucurbita pepo L. growth. AM-L1 to AM-L4 were four horizontal soil layers from the central mesh to outer wall in the hyphal compartment of AMF-inoculated treatment, respectively. Bars represent standard errors and different letters above bars indicate significant differences, determined by Duncan’s multiple range test at P < 0.05.
