Assessing quantitative changes in crown area and height of oaks (Quercus spp.) during pollarding process

Document Type : Research article

Authors

1 M.Sc. of Forestry, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran

2 Associate Prof., Department of Forestry, Faculty of Natural Resources, University of Kurdistan and the Center of Research and Development on Forest Management in Northern Zagros, Sanandaj, Iran

Abstract

The aim of this study is to investigate the quantitative changes in the biometric indices of Lebanon oak (Quercus libani Oliv.) and gall oak (Q. infectoria Oliv.) during pollarding process. In a part of the two pollarded strands in northern Zagros of Iran, in which three years had passed from its last pollarding, the name of woody species was recorded and diameter (dbh), total and crown heights, and two perpendicular crown diameters were measured before and after pollarding in a full callipering assessment of all trees (dbh ≥ 5 cm). The results showed that in the pollarding process, crown height and crown area of oak trees decreased on average 15.73 and 30.06%, respectively. In both studied species, the reduction of crown area is significantly more than the crown height. In terms of reduction in crown height and crown area, there was no significant difference between Q. infectoria and Q. libani trees. The most decrease in crown height (27.99%) and crown area (44.85%) indices on diameter classes are related to Q. infectoria trees belonging to the 35 cm diameter class and Q. libani trees belonging to the 55 cm diameter class, respectively. The results indicate a higher decrease in the crown area compares to the crown height of oak trees due to pollarding practice; therefore, it is necessary to partially compensate for this decrease in the crown area by leaving some branches during each pollarding operation, because preserving the canopy is very important for Zagros-forest ecosystems. The only way to conserve these resources is to create a participatory approach as part of the transitional forest policy.

Keywords

References

- Abbasi, L., Shakeri, Z., Shabanian, N. and Bahari, M., 2015. Pollarding effects on Lebanon oak (Quercus libani Oliv.) leaf properties in Baneh forests. Iranian Journal of Forest, 7(1): 87-97 (In Persian).
- Akhavan, R. and Namiranian, M., 2007. Slenderness coefficient of five major tree species in the Hyrcanian forests of Iran. Iranian Journal of Forest and Poplar Research, 15(2): 165-180 (In Persian).
- Anonymous, 2005. Multipurpose forest management plan: emphasis on organizing and management of pollarding in Armardeh, West of Iran. Published by Center of Research and Development on Forest Management in Northern Zagros, University of Kurdistan, Baneh, Iran, 70p (In Persian).
- Fatahi, M., 1994. The Study of Zagros’ Oak Forests and the Most Important Factors of Its Destruction. Publication by Research Institute of Forests and Rangelands, Tehran, Iran, 63p (In Persian).
- Ferrini, F., 2006. Pollarding and its effects on tree physiology: a look to mature and senescent tree management in Italy. Proceedings of the 1st Colloque Européen Sur Les Trognes. Vendôme, Paris, 26-28 Oct. 2006: 8p.
- Geta, T., Nigatu, L. and Animut, G., 2014. Evaluation of potential yield and chemical composition of selected indigenous multi-purpose fodder trees in three districts of Wolayta zone, Southern Ethiopia. World Applied Sciences Journal, 31(3): 399-405.
- Ghahramany, L., Ghazanfari, H., Fatehi, P. and Valipour, A., 2018. Structure of pollarded oak forest in relation to aspect in Northern Zagros, Iran. Agroforestry Systems, 92(6): 1567-1577.
- Ghahramany, L., Salehyan, M. and Ghazanfari, H., 2012. Comparison of forest structure utilized by traditional method with less-disturbed forest stands in northern Zagros (case study: Baneh, western Iran). Forestry Bulletin “Herald of Moscow State Forest University”, 84(1): 52-57 (In Russian).
- Ghahramany, L., Shakeri, Z., Ghalavand, E. and Ghazanfari, H., 2017. Does diameter increment of Lebanon oak trees (Quercus Libani Oliv.) affected by pollarding in Northern Zagros, Iran? Agroforestry Systems, 91(4): 741-748.
- Ghalavand, E., 2014. Study and comparison of biometrical indices of Lebanon oak (Quercus libani Oliv.) in traditionally managed (pollarded) and less-disturbed stands. M.Sc. thesis, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran, 70p (In Persian).
- Ghazanfari, H., Namiranian, M., Sobhani, H. and Mohajer, R.M., 2004. Traditional forest management and its application to encourage public participation for sustainable forest management in the northern Zagros mountains of Kurdistan province, Iran. Scandinavian Journal of Forest Research, 19(S4): 65-71.
- Hosseinzadeh, J. and Pourhashemi, M., 2015. An investigation on the relationship between crown indices and the severity of oak forests decline in Ilam. Iranian Journal of Forest, 7(1): 57-66 (In Persian).
- Jazirehi, M.H. and Ebrahimi Rostaghi, M., 2003. Silviculture in Zagros. University of Tehran Press, Tehran, 560p (In Persian).
- Khedri, L., Ghahramany, L., Ghazanfari, H. and Pulido, F., 2017. A quantitative study of pollarding process in silvopastoral systems of Northern Zagros, Iran. Forest Systems, 26(3): e018.
- Marvie Mohadjer, M.R., 2005. Silviculture. University of Tehran Press, Tehran, 387p (In Persian).
- Morin, R.S., Steinman, J. and Randolph, K.C., 2012. Utility of tree crown condition indicators to predict tree survival using remeasured Forest Inventory and Analysis data. Proceedings of Symposium on Moving from Status to Trends: Forest Inventory and Analysis (FIA). Baltimore, Maryland, 4-6 Dec. 2012: 210-215.
- Naderi, A., 2014. Assessment of Galajar harvesters impact on diameter increment of Lebanon oak (Quercus libani) in Armardeh forests, Baneh. M.Sc. thesis, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran, 87p (In Persian(.
- Namiranian, M., 2000. A study on dimensional characters of beech species in Gorazbon district, Kheyrudkenar forest. Iranian Journal of Natural Resources, 53(1): 87-96 (In Persian).
- Peri, P.L., Bahamonde, H.A., Lencinas, M.V., Gargaglione, V., Soler, R., Ormaechea, S. and Pastur, G.M., 2016. A review of silvopastoral systems in native forests of Nothofagus antarctica in southern Patagonia, Argentina. Agroforestry Systems, 90(6): 933-60.
- Ranjbar, A., Ghahramany, L. and Pourhashemi, M., 2013. Impact assessment of pollarding on biometrical indices of Lebanon oak (Quercus libani Oliv.) in Belake forests, Baneh. Iranian Journal of Forest and Poplar Research, 20(4): 578-594 (In Persian).
- Rawat, Y.S. and Everson, C.S., 2013. Availability and use of willow species in representative cold desert areas of northwestern Himalaya, India. Journal of Mountain Science, 10(3): 472-481.
- Rostami Jalilian, A., Ghahramany, L., Ghazanfari, H. and Shakeri, Z., 2017. Response of Gall oak (Quercus infectoria Oliv.) to pollarding in northern Zagros. Iranian Journal of Forest and Poplar Research,24(4): 633-645 (In Persian).
- Sagheb Talebi, Kh., Sajedi, T. and Pourhashemi, M., 2014. Forests of Iran: A Treasure from the Past, a Hope for the Future. Springer, Dordrecht, 152p.
- Schomaker, M.E., Zarnoch, S.J., Bechtold, W.A., Latelle, D.J., Burkman, W.G. and Cox, S.M., 2007. Crown-Condition Classification: A guide to Data Collection and Analysis. General Technical Report SRS–102, US Department of Agriculture, Forest Service, Southern Research Station, Asheville, North Carolina, 78p.
- Shakeri, Z., 2006. Ecological and silvicultural effects of pollarding on oak forests of Baneh. M.Sc. thesis, Faculty of Natural Resources, University of Tehran, Karaj, 62p (In Persian)
- Thakur, P.S. and Thakur, A., 2007. Canopy management in agroforetsry-options and strategies: 533-545. In: Puri S. and Panwar, P. (Eds.). Agroforestry Systems and Practices. New India Publishing Agency, New Delhi, India, 666p.
- Valipour, A., Plieninger, T., Shakeri, Z., Ghazanfari, H., Namiranian, M. and Lexer, M.J., 2014. Traditional silvopastoral management and its effects on forest stand structure in northern Zagros, Iran. Forest Ecology and Management,327: 221-230.
Iranian Journal of Forest and Poplar Research
Volume 28, Issue 3 - Serial Number 81
January 2021
Pages 308-321

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