The Impact of <i>Phyllostachys heterocyclas</i> Expansion on the Phylogenetic Diversity and Community Assembly of Subtropical Forest.

In the shrub layer, the Simpson, Shannon, and Pielou indices showed no significant changes across the expansion gradient, although the Shannon index exhibited an increasing trend with deeper expansion (τ ≈ 0, p > 0.5).

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Across all four shrub-community stages, NRI and NTI values were < 0, indicating overall phylogenetic overdispersion; NRI showed a decreasing trend with deeper expansion, but this trend was not statistically significant.

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Permutation tests further showed that Moso bamboo cover was a significant predictor across all strata; among the soil variables, pH was significant in the tree layer, while total phosphorus (TP) was significant in the shrub layer (and marginally significant in the herb layer).

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