Species diversity changes of Platycladus orientalis community at different succession stages in Xuzhou City

SUI Xiran, LI Jun, CHEN Juan, HUA Jun, SHEN Qian, YANG Hongsheng, HE Qiancheng, LI You, WANG Wei, PENG Ye, GE Zhiwin, ZHANG Zengxin

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2025, Vol. 49 ›› Issue (1) : 171-178.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2025, Vol. 49 ›› Issue (1) : 171-178. DOI: 10.12302/j.issn.1000-2006.202301003

Species diversity changes of Platycladus orientalis community at different succession stages in Xuzhou City

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Abstract

【Objective】This study explored the composition and diversity of plant communities at different succession stages of Platycladus orientalis in typical limestone mountainous areas of Xuzhou City, and revealed changes in species substitution and community structure.【Method】The community characteristics and influencing factors of P. orientalis in four different succession stages: shrub grassland, coniferous forest, coniferous-broadleaf mixed forest, and broadleaf forest were analyzed using a space-for-time substitution method and typical sample plot surveys. 【Result】 (1) A total of 105 plant species across the sample plots, representing 58 families and 96 genera. Species diversity across succession stages included: 14 families, 18 genera, and 20 species in shrub grasslands; 33 families, 49 genera, and 51 species in coniferous forests; 43 families, 59 genera, and 64 species in coniferous-broadleaf mixed forests; and 27 families, 44 genera, and 45 species in broadleaf forests. (2) Regarding importance values of plant species in different succession stages, P. orientalis consistently ranked first in the tree layer, while Broussonetia papyrifera ranked first in the shrub layer, showing a pattern of initial decline followed by an increase. In the herbaceous layer, the species with the highest importance values across the four succession stages were Aristolochia debilis, Rubus parvifolius, Solanum lyratum, and Hedera nepalensis. (3) The Shannon-Wiener diversity index, Margalef richness index, Pielou evenness index, and Simpson dominance index of community followed a similar trend, initially increasing and then decreasing as succession progressed. The diversity index peaked in the coniferous-broadleaf mixed forest stage. (4) The correlation analysis between plant diversity indices and environmental factors indicated that species diversity changes during the succession of P. orientalis forests in Xuzhou’s limestone mountains were significantly correlated with canopy density, slope position, and slope aspect, with canopy density having the greatest influence on the Shannon-Wiener diversity index (P< 0.05). 【Conclusion】 The plant diversity in P. orientalis forests in Xuzhou’s limestone mountainous area peaked during the coniferous-broadleaf mixed forest stage. The study identified canopy closure, slope position, and slope orientation as key factors influencing plant diversity. These findings provide theoretical bases for the transformation and management of near-natural forest stands in the region.

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limestone hill region of Xuzhou / Platycladus orientalis plantation / plant community / community succession / plant diversity / forest improvement

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SUI Xiran , LI Jun , CHEN Juan , et al . Species diversity changes of Platycladus orientalis community at different succession stages in Xuzhou City[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2025, 49(1): 171-178 https://doi.org/10.12302/j.issn.1000-2006.202301003

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