Quantitative methodologies for ecotone determination on north slope of Changbai Mountains

Abstract

Abstract: Based on the community important values and present-absent data along elevation gradient on the north slope of Changbai Mountains and using moving split-window techniques,the width and location of vegetation ecotone were discussed in this article.The results showed that the methods of Bray-Curtis Percent Dissimilarity(PD)and Squared Euclidean Distance(SED)introduced in the analysis gave the similar results.Among the methods used in the moving split-window analysis,the SED method was the best in showing the variation of ecotone.According to the results of moving split-window techniques analysis,the ecotone between broad leaved-pine forest and dark conifer forest was gradual type,located in 1 120 m a.s.l.,spanned 200 m.;that between dark conifer forest and Betula ermanii forest was sharp type,located in 1 790 m a.s.l.,spanned 50 m;and the timberline was a sharp line,located in 2 000 m,spanned 40 m.

Key words: Changbai Mountains, Ecotone, Ordination, Moving split-window method

CLC Number:

Q948.15

YU Dapao, TANG Lina, WANG Shaoxian, WANG Shunzhong, DAI Limin. Quantitative methodologies for ecotone determination on north slope of Changbai Mountains[J]. Chinese Journal of Applied Ecology, 2004, (10): 1760-1764.

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