With the increase of competition index, the seedling and sapling density and tree species richness index had a single valley distribution, and the young tree density and tree species richness index showed a decreasing trend.
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Influence of strata-specific forest structural features on the regeneration of the evergreen broad-leaved forest in Tianmu Mountain.
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The sentences
With the increase of the tree species richness index in the whole stand, seedling density and tree species richness index showed an increasing trend, and young tree density and tree species richness index showed a unimodal distribution.