FIGURE 2.

Redundancy analysis (RDA) of the AMF community based on OTU matrix from different treatments. The different color points represent different treatments. The three arrows represent three environment factors: M (+/-) represents treatments with (+) and without (-) organic manure; P (+/-) represents treatments with (+) and without (-) P fertilizer; N (+/-) represents treatments with (+) and without (-) N fertilizer. According to Monte Carlo permutation test the significances are: M (+/-): r² = 0.7695, P = 0.002; P (+/-): r² = 0.5048, P = 0.04; N (+/-): r² = 0.6472, P = 0.022. NK, soil treated with chemical N and K fertilizer; NPK, soil treated with chemical N, P, and K fertilizer; NPKM, soil treated with chemical fertilizer (N, P, and K) plus organic manure; and M, soil treated with only organic manure. The number (1, 2, and 3) following the treatment indicates replicates of each treatment.