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Publishing Language: Chinese

Impact of selective logging of dominant Acacia mangium trees on understory shrub diversity

Jia YANG, Wencheng PENG(), Liguo LIAO, Ru WANG, Zuojun DUAN
Hainan Academy of Forestry, Haikou 571100, Hainan, China
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Abstract

Objective

Selective cutting is a powerful tool to promote the growth and regeneration of understory shrubs. Analyzing the effect and extent of selective cutting of dominant Acacia mangium trees on shrub diversity, and constructing a predictive model for the influence range, can provide significant guidance for establishing scientifically sound selective cutting techniques for A. mangium forests.

Method

76 dominant A. mangium trees in Nanya Forestry Farm, Hainan province, were studied through a selective cutting experiment (monitored from 2014 to 2021). By setting up different plot sizes (0.6 times crown radius, 0.8 times crown radius, 1.0 times crown radius, 1.2 times crown radius, 1.4 times crown radius), the maximum influence range of A. mangium trees was determined, and the influence on understory shrub diversity across different recovery periods was analyzed, so as to construct a predictive model for the influence range of dominant A. mangium trees.

Result

The maximum influence range of dominant A. mangium trees on shrub Shannon index and Pielou index were 1.0 times measured crown width and 1.2 times measured crown width, respectively. Selective cutting of A. mangium trees significantly increased understory shrub diversity (P < 0.05), with usual shrub Shannon index and Pielou index significantly increasing within 5 years after cutting (P < 0.05), and the increase rate being not obvious after 5 years (P > 0.05). The predictive models for the influence range of the shrub Shannon index and Pielou index are best represented by Richards' curves, with their respective determination coefficients amounting to 0.702, and root-mean-square percent errors being 14.341%.

Conclusion

The selective cutting of a single A. mangium tree significantly improves understory shrub diversity within a certain range and over a certain period, and its maximum influence range is closely related to the breast height diameter of the A. mangium trees. These findings can provide effective guidance for subsequent density control and reformation of A. mangium forests.

Keywords

crown widthbiodiversityselective cuttingpredictive modelAcacia mangium
CLC number: S718.54 Document code: A Article ID: 1673-923X(2024)04-0018-10

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Journal of Central South University of Forestry & Technology
Volume 44 Issue 4,
April 2024
Pages 18-27
DOI: 10.14067/j.cnki.1673-923x.2024.04.003
Cite this article:
YANG J, PENG W, LIAO L, et al. Impact of selective logging of dominant Acacia mangium trees on understory shrub diversity. Journal of Central South University of Forestry & Technology, 2024, 44(4): 18-27. https://doi.org/10.14067/j.cnki.1673-923x.2024.04.003
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