We analyzed the spatial heterogeneity of plant species diversity in shrub layers and its relationship with light environment in plantation and - mixed forest, following the method of geostatistics. The results showed that plant species diversity indices (Shannon , Simpson , Margalef ) of shrub layers in plantation were significantly lower than that in - mixed forest. The variation ranges and spatial autocorrelation distances of plant species diversity index in plantation were higher than that in - mixed forest, with lower spatial homogeneity but stronger spatial dependence. The plant species diversity indices of , and structural ratios of shrub layers in pure forest were 44.2%-49.7%, with moderate spatial autocorrelation. The structure ratios of , and in - mixed forest were 1.5%-3.3%, with strong spatial autocorrelation. The spatial distribution of biodiversity showed obvious strip-like gradient trend in plantation and patchy gradient change in mixed forest, suggesting that the spatial continuity of plant species of shrub layers was worse in - mixed forest and that the spatial variation was stronger than that in pure forest. Results of correlation analysis and stepwise regression analysis showed that the total light and plant canopy openness were the most significant factors affecting plant species diversity of shrub layers in both forest types. Light environment formed by plant canopy structure played a crucial part in maintaining plant diversity in shrub layer.
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