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FOREST RESOURCES WANAGEMENT ›› 2008›› Issue (5): 86-89.doi: 10.13466/j.cnki.lyzygl.2008.05.012

• Science and Technology • Previous Articles     Next Articles

Study on Intraspecific and Interspecific Competition of Picea crassifolia in Liancheng National Nature Reserve of Gansu

MAN Zihong1, ZHANG Xiaocui2, QU Xuefang1, ZHANG Yude1, CHEN Xuelin2, 3   

  1. 1. Management Bureau of Liancheng National Nature Reserve,Yongdeng,Gansu 730333,China;
    2. College of Life Science,Northwest Normal University,Lanzhou,Gansu 730070,China;
    3. Key Laboratory of Arid and Grassland Ecology of the Ministry of Education,Lanzhou University,Lanzhou,Gansu 730000,China
  • Received:2008-08-26 Revised:2008-09-19 Online:2008-10-28 Published:2020-12-08

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Abstract: Using Hegyi’ s competition index model for individual tree,we analyse the intraspecific and interspecific competition of Picea crassifolia in Liancheng National Nature Reserve of Gansu.The results show that intraspecific competition intensity of Picea crassifolia reduced with increase in diameter scale of the trees.The intraspecific competition is more bigger than interspecific competition.The order of competition intensity(CI)is:Picea crassifolia>Picea wilsonii>Acer tetramerum var.betulifolium>Populus davidiana>Betula albo-sinensis>Salix sp.The relationship between competition intensity and individual growth of objecttive tree follows closely the equation CI=AD-B.When the diameter scale reaches 45 cm,there is little change of competition intensity.The CI of Picea crassifolia has plus correlation with altitude and crown density.

Key words: Gansu, Liancheng National Nature Reserve, Picea crassifolia, intraspecific competition, interspecific competition

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