Advertisement

Journal of Forestry Research

, Volume 10, Issue 1, pp 1–6 | Cite as

Comparative study on population age structures betweenAdenophora lobophylla andA. potaninii

  • Zhang Wenhui
  • Zu Yuangang
  • Yan Xiufeng
Article

Abstract

Comparing with an affinity and widespread speciesAdenophora potaninii, the age structures of A.lobophylla population, an endangered plant species were studied. 29 sample plots were investigated in the centered distribution area, Jinchuan county from altitude 2 300 m to 3 400 m. The main factors which influence the population age structures of A.lobophylla were analyzed. The principal characteristics of A.lobophylla populations are that the number of seedling and the density of population are much less than these of A.potaninii population. Below altitude of 2 700 m, the age structures of most A.lobophylla populations show the declining status, only above altitude of 2 700 m they are stable, while age structures of all populations of A.potaninii populations at corresponding altitude perform stable and developing features. The age structure patterns, relations between age (x) and number of individual (y) of stable populations of A.lobophylla can be expressed by equation: y =e(a-bx), and the longest life span is 25a. Whereas A.potaninii populations can be expressed by the equation: y =ax-b, and the longest life span of individual is 21a. The external factors, which constrain the extension of A.lobophylla population, are extreme environmental conditions such as serious drought, external disturbance and low temperature.

Key words

Adenophora lobophylla population A.potaninii Age structure Endangered plant 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Fiedler, P. L. 1977. Life history and population dynamics of Rare and common Mariposa lilies (Calachortus pursh Liliaceeae). Journal of Ecology, 75: 977–995Google Scholar
  2. Ge Song and Hong Deyuan. 1994. Study on biosystem ofAdenophora potaninii complex, (I) (Campanulaceae). Acata Phytotaxonomica Sinica,32(6): 489–503 (in Chinese with English summary)Google Scholar
  3. Ge Song and Hong Deyuan. 1995a. Biosystematic study onAdenophora potaini Korsh. complex (Campanulaceae) II. Cathay,6: 5–26 (in Chinese with English summary)Google Scholar
  4. Ge Song and Hong Deyuan. 1995b. Biostematic study onAdenophora potainii Korsh. complex (Campanulaceae) III. Acata Phytotaxonomica Sinica,33(5): 433–442 (in Chinese with English summary)Google Scholar
  5. Grawley, M. 1991. Plant ecology. Blackwell: Scientific Publication Editorial Office, 90–125Google Scholar
  6. Hong Deyuan. 1983. Sinitic flora. Beijing: Science Press,72(2): 67–71 (in Chinese with Latin)Google Scholar
  7. Hu Deyuan. 1990. Soil in A-ba Area. Chendu: Sichuan Science and Technology Press, 80–130 (in Chinese)Google Scholar
  8. Mehrhoff, L. A. 1989. The dynamic of declining populations of an endangered orchid,Isotria medeoloides. Ecology,70: 783–786CrossRefGoogle Scholar
  9. Pielou, E. C. 1977. Mathematical ecology. New York: A. Wiley-Interscience Publication, 15–96Google Scholar
  10. Silvertown, J. W. (Zhu Ninget al. translated) 1982 Introduction to plant population ecology. Harbin: the Press of Northeast Forestry University, 20–106 (in Chinese)Google Scholar
  11. Zhang Rongzu. 1992. Dry river valley of Hongduan Mountain, Beijing: Science Press, 20–133 (in Chinese with English summary)Google Scholar
  12. Zhang Wenhui and Zu Yuangang. 1998a. Investigation on distribution area and the characteristics of biology and ecology ofAdenophora lobophylla an endangered species. Bulletin of Botanical Research,18(2): 209–217 (in Chinese with English summary)Google Scholar
  13. Zhang Wenhui and Zu Yuangang. 1998b. Study on the individual growth dynamic ofAdenophora lobophy (2)— the root system growth dynamic in the life span. Bulletin of Botanical Research,18(1): 128–136Google Scholar
  14. Zhu Ning. 1993. Study on Acanthopanan senticosus population ecology (I), age structure of population. Journal of Applied Ecology,4(2): 113–119 (in Chinese with English summary)Google Scholar
  15. Zu Yuangang, Zhang Wenhui, Wu Shuangxiu,et al. 1997. Comparative Study on Secual Reproduction and Asexual Propagation between Population ofAdenophora lobophylla andA. potaninii. Acta Botanica Sinica,39: (11) 1065–1072 (in Chinese with English summary)Google Scholar
  16. Zu Yuangang, Yan Xiufeng, Zhang Wenhuiet al. 1998. Gas exchange and water use efficiency ofAdenophora lobophylla (Campanulaceae) at different altitudes on the east boundary of the Qing-zang Plateau. Acata Botanica Sinica,40(10): 947–954Google Scholar

Copyright information

© Northeast Forestry University 1999

Authors and Affiliations

  • Zhang Wenhui
    • 1
  • Zu Yuangang
    • 1
  • Yan Xiufeng
    • 1
  1. 1.Open Research Laboratory of Forest Plant EcologyNortheast ForestryUniversityHarbinP.R.China

Personalised recommendations