生长空间竞争指数及其在油松、侧柏种内竞争中的应用研究

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Abstract

Competition between individuals is the foundation of the forest ecosystem research.Basically,there are two research methods,qualitative description and quantitative analysis.Over 20 various competition indices were developed to estimate competition degree.However,none of these indices could accommodate the problem of tree canopy changes in the quantitative analysis reasonably.This paper put forward a new conception of Growth Space Competition Index(GSCI) first time.GSCI is the ratio of canopy surface area to basal-area of trunk.The canopy surface area received most of the light and is an important index that determines the productivity efficiency.Thus,using canopy surface area as a competition parameter in population and community is the best way to accommodate the problem of canopy changes in the quantitative analysis.GSCI is an no-dimension measure unit on canopy cover degree.This paper also applied the GSCI in the intraspecies individual competition of Pinus tabulaeformis and Platycladus orientalis forests,and compared with Competition Index(CI) and Growth Space Index(GSI).

Key words： Competition index system Growth space competition index(GSCI) Growth space index(GSI) Competition index(CI) Comparison research Pinus tabulaeformis forest Platycladus orientalis forest

Received: 25 October 2006

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	MA Lu-yi
	WANG Xi-qun

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MA Lu-yi,WANG Xi-qun. Growth space competition index(GSCI)and application in the individual intraspecies competition of Pinus tabulaeformis and Platycladus orientalis forests[J]. , 2006, 25(5): 385-389.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2006/V25/I5/385

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