Understory species diversity and its influencing factors of Pinus henryi plantation

doi:10.14088/j.cnki.issn0439-8114.2025.06.018

Abstract

Abstract: The species composition and dominant characteristics of shrub and herbaceous layers under Pinus henryi plantations were investigated, and the effects of stand structure and environmental factors on species diversity were analyzed to provide a basis for optimizing forest management measures to enhance understory species diversity. Twelve fixed plots were established in P. henryi plantations in State-owned Bashan Forest Farm of Badong County, Hubei Province. Species composition and diversity were evaluated using indices such as importance value (IV) and Shannon-Wiener index. Redundancy analysis (RDA) was applied to reveal the mechanisms through which stand structural indices and environmental factors (e.g., aspect, canopy closure) influenced understory species diversity. The results indicated that 111 shrub species (30 families, 54 genera) and 112 herbaceous species (45 families, 84 genera) were recorded. Shrub species richness was significantly positively correlated with aspect and stand density (P < 0.05), while herbaceous species richness was significantly negatively correlated with stand volume (P < 0.05) and canopy closure (P < 0.05) and positively correlated with openness (P < 0.01). RDA revealed that aspect was the most critical factor influencing the species diversities of shrubs and herbs. Stand volume had a significant positive effect on shrub diversity (P < 0.05), while mingling degree and uniform angle index positively influenced herbaceous diversity. Aspect, canopy closure, and mingling degree were identified as key factors affecting understory species diversity under P. henryi plantations. Optimizing stand structure to improve the spatial distribution of understory light resources could enhance species diversity and strengthen the stability and functionality of plantation ecosystems.

Key words: Pinus henryi plantation, species diversity, stand structure, influencing factors

CLC Number:

S718.5

ZHANG Meng, SONG Fei, CHEN Gong-ping, WANG Yang. Understory species diversity and its influencing factors of Pinus henryi plantation[J]. HUBEI AGRICULTURAL SCIENCES, 2025, 64(6): 110-116.

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