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Soil microbial community assembly processes between farmland and grassland. (A) The values of βNTI for soil microbial communities (t test, P < 0.001). Horizontal dashed gray lines indicate the thresholds at βNTI = +2 and −2, respectively. (B) The fraction of soil microbial community assembly governed principally by deterministic processes (variable selection and homogeneous selection) or stochastic processes (dispersal limitation, homogenizing dispersal, and undominated processes).
