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Redundancy analysis (RDA) ordination of species diversity index and soil factors for axis1 and axis2. (S = Species richness indexes; H′ = Shannon–Wiener index; D = Simpson index; Sit = powder content; Sad = sand content; medi size = median particle size; TN = total nitrogen; SOM = soil organic matter; EC = electrical conductivity; AK = available potassium content; AP = available phosphorus; RZ = soil bulk density).
