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The beta diversity of fumigated soil samples in different years. a PCA based on phylum level; b PCA based on genus level; c PCA based on total OTUs; d Cluster analysis based on bray–curtis. e PCoA analysis with unweighted UniFrac; f PCoA analysis with weighted UniFrac. NF non-fumigation, F_1 chloropicrin-fumigation for 1 year, F_3 continuous chloropicrin-fumigation for 3 years
