عامل‌های مؤثر در شکل‌گیری ساختار جنگلی حاشیه رودخانه ارس (مطالعه موردی: استان اردبیل)

نوع مقاله : علمی- پژوهشی

نویسندگان

1 هیأت علمی دانشگاه ملایر

2 پژوهشگر موسسه تحقیقات جنگلها و مراتع کشور

چکیده

به‌منظور بررسی عامل‌های مؤثر در شکل‌گیری ساختار پوشش جنگلی حاشیه رودخانه ارس، منطقه موردمطالعه براساس مشخصه‌های پوشش گیاهی (طبیعی و دست‌کاشت)، اندازه تخریب حاشیه رودخانه و عوارض طبیعی به پنج واحد تقسیم شد. در هر واحد، شرایط اکولوژیکی، مسائل اقتصادی- اجتماعی و خصوصیات جنگل‌شناسی مانند تراکم، قطر متوسط، ارتفاع متوسط، شکل پرورشی، تاج‌پوشش، وضعیت و کیفیت درختان بررسی و اندازه‌گیری شدند. بررسی مشخصه‌های جنگل‌شناسی از طریق 20 قطعه‌نمونه مربعی‌شکل به ‌ابعاد 10×10 متر و به‌روش منظم- تصادفی انجام گرفت. با توجه به یافته‌های تحقیق مشخص شد که در واحدهای موردمطالعه اختلاف معنی‌داری بین تراکم گونه‌ها در سطح اطمینان 99 درصد وجود دارد، درحالی‌که قطر و ارتفاع متوسط گونه‌ها هیچ‌گونه اختلاف معنی‌داری را نشان ندادند. مطالعه وضعیت اقتصادی- اجتماعی در هریک از واحدهای مورد مطالعه نشان داد که بین دام‌های موجود در منطقه طرح با تراکم گونه‌ها ارتباط معنی‌دار منفی در سطح اطمینان 99 درصد وجود دارد، درحالی‌که بین جمعیت موجود و تراکم گونه‌ها هیچ‌گونه ارتباط معنی‌داری وجود ندارد. دیگر نتایج این بررسی نشان داد که بین تراکم گونه‌های درختی موجود با بافت خاک ارتباط معنی‌داری در سطح اطمینان 95 درصد وجود دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Effective factors in formation of forest structure in Aras riparian zone (Case study: Ardebil Province)

نویسندگان [English]

  • Farhad Ghasemi Aghbash 1
  • Ali Mohebbi 2
1 Assistant Professor, Department of Forestry, Faculty of Natural Resources and Environment, University of Malayer, Malayer, Iran
2 Research Expert, Research Institute of Forests and Rangelands, Tehran, Iran.
چکیده [English]

A study was conducted to investigate the effective factors in the formation of the forest structure across the Aras Riparian Zone in northwestern Iran. To this aim, the study area was divided into 5 units based on the vegetation status (natural, artificial), destruction rate of riparian zone and topography. The silvicultural (e.g. density, average diameter, average height, growth form, canopy cover and quality of trees), ecological and socioeconomic ecological, socioeconomic parameters were studied in each unit.The silvicultural parameterswere surveyedwithin a number of 20 sample plots each encompassing 10×10 m which were selected by randomized systematic design. The results showed that species density was the only factor showing a significant difference (p<0.01) amongst the units, whereas the average diameter and the average height did not were not significantly different. As a socioeconomic factor, livestock showed to bear a negative significant correlation with species density (p<0.01), whereas the population proved not to be significantly associated with species density. Further results showed that a difference in soil texture is significantly correlated (p<0.05) with the density of tree species. 

کلیدواژه‌ها [English]

  • Silvicultural parameters
  • riparian zone
  • Forest structure
  • Aras river basin

مراجع

- Aguiar, F., Martins, M.J., Bejarana, M.D., Portela, M.M and Cardoso, J. 2013. Effects of dam-regulated flows and fragmentation in species and trait composition of streamside forests. Abstracts of the 56th IAVS Symposium: Vegetation Patterns and Their Underlying Processes. Estonia, 26-30 June 2013: pp 5.
- Anonymous, 1984. Annual Inventory of Ardabil Province of Iran. Published by Management and Planning Organization of Ardabil Province, 550p (In Persian).
- Anonymous, 2004. Forest Plantation Project of Aras River Margin. Natural Resources General Office of Ardabil province, 10p (In Persian).
- Busch, D.E. and Smith, S.D. 1995. Mechanisms associated with decline of woody species in riparian ecosystems of the south western U.S. Ecological Monographs, 65(3): 347-370.
- Clary, W.P. and Webster, B.F. 1989. Managing grazing of riparian areas in the Inter Mountain Region. Forest Service, Department of Agriculture, Intermountain Research Station, General Technical Report, 11p.
- Di Tomaso, J.M. 1998. Impact, biology and ecology of saltcedar (Tamarix spp.) in the Southwestern United States, pp. 326-336. In: Whitson, T.D. (ed). Symposium: Integrated Systems for Noxious Weed Management on Rangelands. Weed Technology, 12(2):325-416.
- Howe, W.H. and Knopf, F.L. 1991. On the imminent decline of Rio Grande cotton woods in central New Mexico. The South Western Naturalist, 36(2): 218-224.
- Jowett, I.G., Richardson, J., Boubee, J.A.T. 2009. Effects of riparian manipulation on stream communities in small streams: two case studies. New Zealand Journal of Marine and Freshwater Research, 43: 763-774.
- Liu, W., Liu, G., Liu, H., Song, Y. and Zhang, Q. 2013. Subtropical reservoir shorelines have reduced plant species and functional richness compared with adjacent riparian wetlands. Environmental Research Letters, 8(4): 1-10.
- Masek Lopez, S. 2006. Riparian restoration on Hopi lands. Abstracts of the 20th Meeting of the Arizona Riparian Council: Riparian issues: Reflections on our past and challenges for our future. Arizona, 27-29 April 2006: 8-9.
- Sferra, S., Beatty, G., Ellis, L., Messing, H. and Paxton, E. 2006. The southwestern willow flycatcher in Arizona: What we have learned since the early 1990s and the outlook for the future. Abstracts of the 20th Meeting of the Arizona Riparian Council, Arizona, 27-29 Apr. 2006: 11-12.
- Stephenson, J.R. and Calcarone, G.M. 1999. Southern California Mountains and foothills assessment: Habitat and species conservation Issues. General Technical Report PSW-GTR-172,  Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture, 402p.
- Sigafoos, R.S. 1964. Botanical evidence of floods and flood- Plain deposition. U.S. Geological Survey, Professional Paper, 35p.
- Stromberg, J.C. 1997. Growth and survivorship of fremont cotton wood, gooding willow and salt cedar seedling after large floods in central Arizona. Great Basin Naturalist, 57: 198-208.
- Stromberg, J., Lite, S., Marler, R., Paradzick, C., Shafroth, P., Shorrock, D., White, J. and White, M. 2006. Abundance of introduced tamarix in arid basins of Arizona Reflects Prevailing Hydrology. Abstracts of the 20th Meeting of the Arizona Riparian Council, Arizona, 27-29 Apr. 2006: 13-14.

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