Abstract:
Objective To provide a scientific reference for the sustainable management of evergreen deciduous broad-leaved mixed forest in southwest Hubei.
Method The stand spatial structure and species diversity as well as their correlations in the different spatial scales ranging from the sample size 20 m × 20 m to 200 m× 200 m in the subtropical evergreen deciduous broad-leaved mixed forests in Qizimeishan National Nature Reserve, Mulinzi National Nature Reseve and Jinzishan National forest farm in southwest Hubei province were explored.
Result The tree species were abundant in this study, and Carpinus fargesiana, Cyclobalanopsis multinervis and Castanea henryi were dominant tree species. The spatial structure diversities tended to be stable when the sample size ≥ 120 m× 120 m, showing the state of micro-aggregation distribution, moderate differentiation and good mixing. The Uniform angle index was correlated with species diversity (p < 0.01) at different scales, while other structural parameters had no correlations with species diversity.
Conclusion The optimum investigation scale for the stand spatial structure of subtropical evergreen deciduous broad-leaved mixed forest in southwest Hubei is 120 m × 120 m. In addition, the Uniform angle index was a key factor of stand spatial structure affecting species diversity in different spatial scales.
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