The impact of some ecological factors on the regeneration of the species of Taxus baccata L. in the Arasbaran Forests

Öz

Taxus baccata L. is among the few indigenous and rare needle -leaf trees of the Arasbaran forests facing extinction due to various reasons. In order to investigate the impact of some of physiographic factors on the natural regeneration of this species, two growing areas of Kolaleh with an area of 40 hectares and Kouran with an area of 46 hectares were selected from the Arasbaran forests. The sampling method was selective sampling with 43 pieces of circular samples of the shape 10. As to the same number, sub-plots of the nested type were selected and intended specifications were extracted. The results of this study showed that the regeneration of Taxus baccata L. increases upward with the increasing of the height above the sea level in the Kolaleh habitat and its most appropriate altitude is 1200-1300 meters. At the same time, the most appropriate altitude in the Kouran habitat is between 1400 and 1500 meters. 
 
The most regeneration of this species can be observed in the studied habitats in the northern foothills and the least regeneration can be seen in the northeast. In terms of the interrelationship between foothill slope and the frequency of regeneration, the highest percentage of reproduction took place in the Kolaleh habitat (46.48 percent in the slope of 51 to 60 percent). For the Kouran habitat, this value is about 58 percent for the slope of 41 to 50 percent, the reason for which may be associated to the raising of the soil's humidity and the increasing of surface soil in such slopes. Moreover, the results of Chisquare test showed that there's a significant discrepancy between the number of Taxus baccata L. regeneration and the heights and different directions in the level of 95% contingency.

Anahtar Kelimeler

• Natural regeneration,Taxus baccata L,Height,direction,slope,Arasbaran

The impact of some ecological factors on the regeneration of the species of Taxus baccata L. in the Arasbaran Forests

Abstract

The most regeneration of this species can be observed in the studied habitats in the northern foothills and the least regeneration can be seen in the northeast. In terms of the interrelationship between foothill slope and the frequency of regeneration, the highest percentage of reproduction took place in the Kolaleh habitat (46.48 percent in the slope of 51 to 60 percent). For the Kouran habitat, this value is about 58 percent for the slope of 41 to 50 percent, the reason for which may be associated to the raising of the soil's humidity and the increasing of surface soil in such slopes. Moreover, the results of Chisquare test showed that there's a significant discrepancy between the number of Taxus baccata L. regeneration and the heights and different directions in the level of 95% contingency.

Keywords

• Natural regeneration,Taxus baccata L,Height,direction,slope,Arasbaran

References

1. Amirghassemi, F., 2001, The investigation of the structure of revitalization of Arasbaran forests in the Setan Chay studied area, Iran's Institute for Research on Forests and Pasturages Publication, p. 47
2. Barzegar, A., 2002, The investigation of the habitats of Taxus baccata L. in the Arasbaran forests,
3. M.A. dissertation, the University of Guilan, p. 55 Hosseini, M., 2000, The investigation of the ecologic power of Iran's indigenous acerate-leaf forests, the Ph.D. dissertation of forestry, Tarbiat Modarres University, p. 161
4. Osareh, M. H., 2007, The investigation of the explanatory structure of rhizogenesis and the causes of late production of roots in the scions of Taxus baccata L., Pajoohesh-va-Sazandegi Journal, vol. 74, p.
5. Farsi, M., 2008, An introduction to the application of statistics in agriculture and biological sciences,
6. Mashhad Agricultural Jehad Publications, p. 272 Ghanbari Sharafeh, A., 2005, The investigation of the ecologic sequence of Taxus baccata L. masses in the Arasbaran forests, M.A. dissertation, the University of Tehran, p. 125
7. Lesaani, M. R., 1988, The decadent course of Iran's Taxus baccata L. forests and techniques for revitalizing them, Zeitoun Magazine, vol. 88, pp. 30-31 and 47-48
8. Lesaani, M. R., 1999, Taxus baccata L., Iran's Institute for Research on Forests and Pasturages Publication

9. Yousefpour Rashti, M., 1998, The investigation of regeneration of Taxus baccata L. and the role of the quality of seed in its revitalization, M.A. dissertation, the University of Guilan, p. 82
10. Boyd, J., 1995, Natural Regeneration, University of Wisconsin.
11. Hulme, P., 1996, Natural regeneration of yew (Taxus baccata L.) microsite, Seed or herbivore
12. Limitation, Department of Biological Science Durham England, p. 38 Plaisance, G., 1979, L IF (Taxus baccata) Fort Prive, 126: 34- 47.
13. Prioton, J., 1979, Etude biologiyue et ecologique del IF (Taxus baccata) en Europe occidental,
14. Foret Prive, 128: 19- 34, I portie, Foret Privec, 128: 1937.