Intraspecific and Interspecific Competition of Machilus thunbergii Forest in Zhoushan Islands

doi:10.7525/j.issn.1673-5102.2017.03.015

Abstract

Abstract: Machilus thunbergii forest is one of the typical forest type in coastal areas of Zhejiang. To protect and obtain sustainable utilization of evergreen broadleaved forest in Zhoushan islands, studying the rule of dynamic changes of competition intensities and the ecological adaptation mechanism of M.thunbergii is important and meaningful. By using Hegyi's single-tree competition index model, the intraspecific and interspecific competition intensities of M.thunbergii, one of the dominant species in secondary forest of Taohua Island were quantitatively analyzed. Three types of competition intensity of M.thunbergii were decreased gradually with the increase of objective trees diameter, which showed a stronger competition at a smaller diameter. The intraspecific and interspecific competition intensity of M.thunbergii accounted for 44.55% and 55.45% in the total competition intensity, respectively. The intraspecific competition intensity in M.thunbergii and the interspecific competition intensity of accompanying species were approximately equal, which meant that the intraspecific and interspecific competition were in balance status. The average competition index of deciduous species were strong, while those of evergreen species were weak. The competition mainly came from two competitors:Celtis sinensis and Liquidambar formosana. The order of the intraspecific and interspecific competition intensity of M.thunbergii was:Machilus thunbergii > Celtis sinensis > Liquidambar formosana > Zanthoxylum ailanthoides > Maclura tricuspidata > Cornus macrophylla > Platycarya strobilacea > Styrax confusus > Dalbergia hupeana > Viburnum odoratissimum var. Awabuki > Ficus erecta. There was a significantly negative correlation between three types of competition intensity and the DBH of objective trees. The relationship between the competition intensity and the DBH of objective trees followed the equation CI=AD^-B. The change in competition intensity was very small when the DBH of M.thunbergii reached 20 cm. The model could effectively simulate and predict the intraspecific and interspecific competition of M.thunbergii. The tending management should be actualized to improve the survival of M.thunbergii and promote vegetation restoration when the DBH of M.thunbergii were under 20 cm.

Key words: Machilus thunbergii, intraspecific competition, interspecific competition, competition index, Zhoushan Islands

CLC Number:

Q948.12+2.1

GAO Hao-Jie, GAO Ping-Shi, WANG Guo-Ming. Intraspecific and Interspecific Competition of Machilus thunbergii Forest in Zhoushan Islands[J]. Bulletin of Botanical Research, 2017, 37(3): 440-446.

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