Architectural analysis of <i>Rhododendron fortunei</i> saplings in Mountain Tiantai, Zhejiang Province

LÜ Zhi-wei; BIAN Cai-miao

Dec. 2007

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Article Navigation > Journal of Zhejiang A&F University > 2007 > 24(6): 696-701

LÜ Zhi-wei, BIAN Cai-miao. Architectural analysis of Rhododendron fortunei saplings in Mountain Tiantai, Zhejiang Province[J]. Journal of Zhejiang A&F University, 2007, 24(6): 696-701.

Citation:

LÜ Zhi-wei, BIAN Cai-miao. Architectural analysis of Rhododendron fortunei saplings in Mountain Tiantai, Zhejiang Province[J]. Journal of Zhejiang A&F University, 2007, 24(6): 696-701.

Architectural analysis of Rhododendron fortunei saplings in Mountain Tiantai, Zhejiang Province

LÜ Zhi-wei,
BIAN Cai-miao^,

School of Life Sciences, Taizhou College, Linhai 317000, Zhejiang, China

Received Date: 2007-01-23
Rev Recd Date: 2007-04-01

Abstract

Rhododendron fortunei lives in many kinds of forests in Mountain Tiantai (29°15' N, 121°06' E). Comparative analysis has been made on the architecture of R. fortunei saplings in the canopy gap of defoliated broad-leaved forest and in scrubs edge of the forest. The results showed that saplings in the canopy gap had thinner and narrower crown with longer branch, wider branch angle to horizon, lower bifurcation ratio and leaf angle to horizon, in comparison with those in the scrubs. All the differences were especially noticeable in the undergrowth. This indicated that the saplings would spread their leaves to receive more sunlight. Saplings had a low angle of leaves, and the leaves were smaller than those of the petiole, which made it possible for them to receive more scattered light. And the ratio of branch diameter, azimuths of branch and leaves had no significant difference. In addition, saplings mainly adopted monopodial branching, and the apical dominance was not evident. So the crown was characterized by sympodial branching in the canopy gap. It followed that the character of ramification of the R. fortunei had the relative stability, but in the two different habitats, bifurcation ratio, branch length, the angle of branch and leaf all varied significantly, and there was a certain tradeoff between the length of branch and the bifurcation ratio.
- botany,
- Rhododendron fortunei,
- microhabitats,
- architecture,
- Mountain Tiantai

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[16]	BORCHERT R, SLADE N A. Bifurcation ratios and the adaptive geometry of trees[J]. Bot Gaz, 1981,142:394-401.
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通讯作者: 陈斌, bchen63@163.com

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Architectural analysis of Rhododendron fortunei saplings in Mountain Tiantai, Zhejiang Province

School of Life Sciences, Taizhou College, Linhai 317000, Zhejiang, China

Received Date: 2007-01-23

Rev Recd Date: 2007-04-01

Key words:

Abstract: Rhododendron fortunei lives in many kinds of forests in Mountain Tiantai (29°15' N, 121°06' E). Comparative analysis has been made on the architecture of R. fortunei saplings in the canopy gap of defoliated broad-leaved forest and in scrubs edge of the forest. The results showed that saplings in the canopy gap had thinner and narrower crown with longer branch, wider branch angle to horizon, lower bifurcation ratio and leaf angle to horizon, in comparison with those in the scrubs. All the differences were especially noticeable in the undergrowth. This indicated that the saplings would spread their leaves to receive more sunlight. Saplings had a low angle of leaves, and the leaves were smaller than those of the petiole, which made it possible for them to receive more scattered light. And the ratio of branch diameter, azimuths of branch and leaves had no significant difference. In addition, saplings mainly adopted monopodial branching, and the apical dominance was not evident. So the crown was characterized by sympodial branching in the canopy gap. It followed that the character of ramification of the R. fortunei had the relative stability, but in the two different habitats, bifurcation ratio, branch length, the angle of branch and leaf all varied significantly, and there was a certain tradeoff between the length of branch and the bifurcation ratio.

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[2]	FISHER J B. Branching pattern and angles in trees[M]//GIVNISH J T. On the Economy of Plant Form and Function. London:Cambridge University Press,1986:493-518.
[3]	HALLE F, OLDERMAN R A A, TOMLINSON P B. Tropical Trees and Forests:an Architectural analysis[M]. Berlin:Springer-Verlag,1978.
[4]	方云亿.浙江植物志:第5卷[M].杭州:浙江科学技术出版社, 1989:9-10.
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[11]	MAILLETTE L. Structure dynamics of silver birch 1. the fate of bud[J]. J Appl Ecol,1982,19:203-218.
[12]	GRREGOIGE T G, VALENTINE H T, FURNIVAL G M. Sampling methods to estimate foliage and other characteristics of individual trees[J].Ecology, 1995,76:1181-1194.
[13]	MCMAHON T A, KRONAUER R E. Tree structures:deducing the principle of mechanical design[J]. J Theor Biol, 1976,59:443-466.
[14]	WHITNEY G G. The bifurcation ratio as an indicator of adaptive strategy in woody plant species[J]. Bull Torrey Bot Club, 1976, 103:67-72.
[15]	STEINGRAEBER D A,WALLER D M. Non-stationary of tree branching pattern and bifurcation ratios[J]. Proc R Soc Lond B, 1986,228:187-194
[16]	BORCHERT R, SLADE N A. Bifurcation ratios and the adaptive geometry of trees[J]. Bot Gaz, 1981,142:394-401.
[17]	SACHLICHTING C D. The evolution of phenotypic plasticity in plants[J]. Ann Rev Ecol Syst,1986,17:667-693.
[18]	TOMLINSON P B. Branching and axis differentiation tropical trees[M]//TOMLINSON P B,ZIMMERMAN M H. Tropical Trees as a Living Systems. London:Cambridge University Press, 1978:187-208.
[19]	祝宁,陈力.刺五加构型研究[M]//祝宁.植物种群生态学研究现状与进展.哈尔滨:黑龙江科学技术出版社,1994:69-73.
[20]	DE KROON H, KNOPS J. Habitat exploitation through morphological plasticity in two chalk grassland percennials[J].Oikos,1990, 59:39-49.

Architectural analysis of Rhododendron fortunei saplings in Mountain Tiantai, Zhejiang Province

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