تغییرات شاخص های تنوع زیستی گروه های اکولوژیک در امتداد گرادیان ارتفاعی (مطالعه موردی: جنگل‌های صلاح الدین کلا، نوشهر)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد جنگلداری، دانشکده منابع طبیعی دانشگاه تربیت مدرس

2 استادیار گروه جنگلداری، دانشکده منابع طبیعی دانشگاه تربیت مدرس

چکیده

هدف از تحقیق حاضر، بررسی تغییرات شاخص‌های تنوع زیستی در بین گروه‌های اکولوژیک جنگل‌های صلاح الدین کلا، نوشهر می‌باشد. برای این منظور تعداد 76 قطعه نمونه 400 متر مربعی، در امتداد دو گرادیان ارتفاعی (1400-100 متر) که به فاصله 1 کیلومتر از یکدیگر قرار داشتند، برداشت گردید. سپس با استفاده از تحلیل TWINSPAN و بر مبنای درصد تاج پوشش گونه‌ها، تعداد 5 گروه اکولوژیک طبقه‌بندی گردید. نتایج آنالیز‌های رج‌بندی و تحلیل واریانس یک‌طرفه نشان دادند که بین گروه-های اکولوژیک منطقه علاوه بر تفاوت از نظر ترکیب گونه‌ای، از نظر شاخص‌های تنوع زیستی گیاهی نیز تفاوت معنی‌داری وجود دارد به‌طوری‌که گروه‌های اکولوژیک اول و دوم که نماینده تیپ ممرز می‌باشند و از نظر ارتفاع از سطح دریا در پایین‌ترین حد ارتفاعی منطقه قرار داشته، از نظر وضعیت شاخص‌های تنوع سیمپسون و شانون- وینر و یکنواختی سیمپسون در بالاترین سطح و گروه‌های سوم، چهارم و پنجم بوده که در محدودن ارتفاعی بالاتری قرار دارند و نماینده تیپ‌های مختلف راش در سطح منطقه می‌باشند دارای بالاترین میزان شاخص غلبه بودند. نتایج همچنین نشان داد که تغییرپذیری غنای گونه‌ای در بین گروه‌ها چندان بارز نمی‌باشد. به طور کلی نتایج نشان داد که عامل ارتفاع از سطح دریا می‌تواند به عنوان یه فاکتور محیطی مهم، نقش تعیین کننده‌ای در تغییرات شاخص‌های تنوع زیستی گیاهی و تفکیک جوامع گیاهی و پراکنش آنها در منطقه ایفا کند.

کلیدواژه‌ها

عنوان مقاله [English]

Changes of plant biodiversity indices in ecological species groups along an altitudinal gradient

نویسندگان [English]

  • kazem nourmohammadi 1
  • omid esmailzadeh 2

1 MSc student, Tarbiat Modares University

2 Assistant Professor Tarbiat Modares University

چکیده [English]

In this paper we described variations of plant biodiversity indices in the plant communities of Salaheddinkola forests, Nowshahr. For this purpose, plant species floristically data with some environmental properties have been recorded in 76 plots (400 m2) along two altitudinal gradients (200–2300 m a.s.l.). Five ecological species groups were distinguished by using the results of TWINSPAN which were done based on floristic cover data. The comparison of diversity indices between ecological groups were done by ANOVA test and DCA Analysis. Results showed that biodiversity indices had significant differences between plant communities. The plant communities I and II, which represents Carpinus betulus-Parrotia persica forests and located in lower elevations had the largest values of Simpson’s Diversiry index, shannon’s Diversiry index and Shannon Evenness index. As well as, Simpson Dominance was maximum in the III, IV and V plant communities, which represents the beech forests at the higher altitudinal ranges. Result also showed that there was no clear trend in Richness index’s along the altitudinal gradient. Finally, we concluded that altitude was a basic factor in variations of plant biodiversity indices and distribution of plant communities in this area.

کلیدواژه‌ها [English]

  • altitude
  • ordination
  • Plant biodiversity
  • Salaheddinkola forests TWINSPAN
 

 Abella, S. R. and Covington, W. W. (2006a) Forest ecosystems of an Arizona Pinus ponderosa landscape: multifactor classification and implications for ecological restorations. Journal of Biogeography 33: 1368- 1383.

  • Abella, S. R. and Covington, W. W. (2006b) Vegetation- environment relationships and ecological species groups of an Arizona Pinus ponderosa landscape, USA. Plant Ecology 185: 255- 268.
  • Aubert, M. Alard, D. Bureau F. (2003) Diversity of plant assemblages in managed temperate forests: a case study in Normandy (France). Forest Ecology and Management 175: 321-337.
  • Barbier, S. Gosselin, F. Balandier, P. (2008) Influence of tree species on understory vegetation diversity and mechanisms involved — A critical review for temperate and boreal forests. Forest Ecology and Management 254 (1): 1-15.
  • Barnes, B.V. Zak, D. R. Denton, S. R. and Spurr, S. H. (1998) Forest ecology, John Wiley and Sons. INC., New York. 773 pp.
  • Barnes, B.V. Pregitzer, K.S. Spies, T.A. Spooner, V.H. (1982) Ecological forest site classification. Journal of Forestry 80: 493-498.
  • Chawla, A. Rajkumar, S. Singh, K. N. Brij Lal, R. D. S. and Thukral, A. K. (2008). Plant species diversityalong an altitudinal gradient of Bhabha Valley in Western Himalaya. Journal of Mountain Science 5: 157-177.
  • Eshaghi Rad, J. Manthey, M. Mataji, A . (2009) Comparison of plant species diversity with different plant communities in deciduous forests. International Journal of Environmental Science Technology 6 (3): 389-394.
  • Eshaghi Rad, J. Manthey, M. Mataji, A. (2009) Comparison of plant species diversity with different plant communities in deciduous forests. International Journal of Environmental Science Technology 6 (3): 389- 394.
  • Fahy, O. Gormally, M. (1998) A comparison of plant and carabid beetle communities in Irish oak woodland with a nearby conifer plantation and clearfelled site. Forest Ecolology and Management 110: 263-273.
  • Grabherr, G. K. Reiter, and Willner, W. (2003) Towards objectivity in vegetation classification: the example of the Austrian forests. Plant Ecology 169: 21 – 34.
  • Hill, M. O. (1973). Diversity and evenness: a unifying notation and its consequences. Ecology,54: 427-432.
  • Hix, D.M. Prearcy, J.N. (1997) Forest ecosystems of the Marietta Unit, Wayne National Forest, Southeastern Ohio: maltifaction classification and analysis. Canadian Journal of Forest Research 27: 1117-1131.
  • Hrivnák, R. Gömöry, D. Slezák, M. Ujházy, K. Hédl, R. Jarčuška, B. and Ujházyová, M. (2013) Species Richness Pattern along Altitudinal Gradient in Central European Beech Forests. Folia Geobotanica 1-17.
  • Jenkins, M.A. Parker, A. (1998) Composition and diversity of woody vegetation in silvicultural openings of southern Indiana forests. Forest Ecology and Management 109:57-74.
  • Kashian, D. M. Barnes, B. V. and Walker, W. S. (2003) Ecological species groups of landform- level ecosystems dominated by jack pine in northern Lower Michigan, USA. Plant Ecology 166: 75- 91.
  • Magurran, A. E. and Magurran, A. E. (1988) Ecological diversity and its measurement (Vol. 168). Princeton: Princeton university press.179 p.
  • Mahdavi, P. Akhani, H. and Van der Maarel, E. (2013) Species diversity and life-form patterns in steppe vegetation along a 3000 m altitudinal gradient in the Alborz Mountains, Iran. Folia Geobotanica 48(1), 7-22.
  • May, R. M. (1975) Patterns of species abundance and diversity. In Ecology and Evolution of Communities (ed. M. L. D. Cody, J. M.). Cambridge, Mass.: Harvard University Press.
  • McCune, B, and Mefford, M. J. (1999) PC-ORD, Multivariate Analysis of Ecological Data, Version 4, MjM Software Design, Glenden Beach, Oregon, USA. 237pp.
  • McNab, W. H. Browing, S. A. Simon, S. A. and Fouts, P. E. (1999) An unconventional approach to ecosystem unit classification in western north Carolina, USA. Forest Ecology and Management, 114: 405- 420.
  • Muller- Dombois, D. and Ellenberg, H. (2003) Aims and methods of vegetation ecology. The Blackburn Press, New Jersey. 547p.
  • Peet, R. (1974) The measurement of species diversity. Annual Review of Ecology and Systematic, 5: 285- 307.
  • Pourbabaei, H. Haghgooy, T. (2012) Plant species diversity in the ecological species groups in the Kandelat Forest Park, Guilan, North of Iran. Biodiversitas 13 (1): 7-12.
  • Sánchez- González, A. and López- Mata, L. (2005) Plant species richness and diversity along an altitudinal gradient in the Sierra Nevada, Mexico. Diversity and Distributions 11(6), 567-575.
  • Sharma, C. M. Suyal, S. Gairola, S. and Ghildiyal, S. K. (2009) Species richness and diversity along an altitudinal gradient in moist temperate forest of Garhwal Himalaya. Journal of American Science 5(5), 119-128.
  • Smith, F. (1996) Biological diversity, Ecosystem stability and economic development. Ecological Economics 16:191-203.
  • Spies, T. A. and Barnes, B. V. (1985) Ecological species groups of upland northern hardwood hemlock forest ecosystems of the Sylvania Recreation Area, Upper Peninsula, Michigan, Canadian Journal of Forestry Research 15: 961- 972.
  • Torras, O. Saura, S. (2008) Effects of silvicultural treatments on forest biodiversity indicators in the Mediterranean. Forest Ecology and Management 255: 3322-3330.
  • Trigas, P. Panitsa, M. and Tsiftsis, S. (2013) Elevational gradient of vascular plant species richness and endemism in Crete–The effect of post-isolation mountain uplift on a continental island system. PloS one 8(3), e59425.
  • vahdati¹, f. b. mehrvarz¹, s. s. naqinezhad, a. and gholizadeh¹, h. a. m. i. d. (2014) How plant diversity features change across ecological species groups A case study of a temperate deciduous forest in northern Iran. ISSN/E-ISSN, 31.
  • Zhang, J.T. Fan, L. Li, M. (2012) Functional diversity in plant communities: theory and analysis methods. Journal of Biotechnology 11 (5): 1014-1022.