تحلیل ترکیب و تنوع گیاهی زیر آشکوب در توده‌ های طبیعی و جنگل‌کاری شده هیرکانی غربی (مطالعه موردی: سنگ پشته رامسر)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای جنگل‌شناسی و اکولوژی جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

2 نویسنده مسئول، دانشیار، گروه جنگل‌داری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

3 هیئت علمی استادیار دانشکده منابع طبیعی نور، دانشگاه تربیت مدرس تهران، نور، ایران

4 دانشیار، گروه جنگل‌داری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

چکیده

این پژوهش با هدف بررسی و ارزیابی پوشش گیاهی زیرآشکوب توده های طبیعی و جنگل‌کاری شده توسکا Alnus subcordata C.A.Mey، پلت Acer velutinum Bioss.، بلندمازوQuercus castaneifolia C.A.Mey. و زربین Cupressus sempervirens subsp. horizontalis (Mill.) A.Camus در سنگ پشته رامسر انجام شد. بدین منظور تعداد 96 قطعه نمونه 400 متر مربعی به روش تصادفی-منظم برداشت شد. پوشش های علفی و زادآوری کف در 480 میکرو قطعه 1× 1 متر مربعی ثبت شدند. طیف زیستی گیاهان بر اساس شکل ‌های رویشی رانکایر و پراکنش جغرافیایی گونه‌ها بر اساس طبقه بندی زهری تعیین شد. یافته‌های حاصل از بررسی نشان داد که 30 گونه گیاهی متعلق به 23 خانواده در کل عرصه ها حضور دارند که بیشترین گونه‌ها متعلق به خانواده‌های Fabaceae، Poaceae ،Rosaceae و Solanaceae بودند. از نظر شکل زیستی همی‌کریپتوفیت‌ها و کریپتوفیت‌ها در مجموع با 73/68 درصد شکل‌های رویشی غالب بودند. بررسی پراکنش جغرافیایی گیاهان منطقه نشان داد که عناصر گیاهی ناحیه اروپا-سیبری بیشترین عناصر گیاهی منطقه مورد پژوهش را تشکیل می‌دهند. بررسی تنوع زیستی گونه‌های گیاهی در توده‌های مورد نظر نشان داد که شاخص‌های تنوع گونه‌ای سیمپسون و شانون وینر و شاخص غنای مارگالف از نظر آماری معنی‌دار نبودند و شاخص‌های غنای منهنیک و شاخص‌های یکنواختی کامارگو و اسمیت ویلسون اختلاف معنی‌داری را نشان دادند. در غنای گونه‌ای شاخص منهنیک در توده بلندمازو بیشترین مقدار و در توده زربین کمترین مقدار را داشته است. در مورد شاخص یکنواختی کامارگو و اسمیت - ویلسون در توده افرا بیشترین مقدار و در توده زربین کمتر از سایر توده‌ها بود.

کلیدواژه‌ها


عنوان مقاله [English]

Analysis of composition and biodiversity of understory plants in natural and reforestation stands of western Hyrcanian(Case Study: Ramsar Sang Poshteh)

نویسندگان [English]

  • maryam bazyari 1
  • vahid etemad 2
  • Yahya Kooch 3
  • Anoshirvan Shirvany 4
1 Department of forestry and forest economics,faculty of natural resources, university of tehran, karaj, iran
2 associate pror of natural resources faculty uni of teheran
3 Assistant Professor, Faculty of Natural Resources, Tarbiat Modares University, Tehran, Iran
4 Associate professor Department of Forestry and Forest Economics Natural Resources Faculty University of Tehran
چکیده [English]

The aim of this study was to evaluate the vegetation cover of alder and broadleaved coniferous forests of alder, maple and oak and compare it with natural forest in Ramsar Ridge. 96 sample plots of 400 square meters were collected by regular random sampling.The bio-spectrum of plants was determined based on the vegetative forms of Rankier and the geographical distribution of species based on the Zohary method. The results showed that 30 plant species belong to 23 families, most of which belonged to Fabaceae and Poaceae, Rosaceae. In terms of biological form, hemicryptophytes and cryptophytes were dominant with 68.73% of vegetative forms. The study of geographical distribution of plants in the region showed that the plant elements of Europe-Siberia constitute the most of the plant elements in the study area. Evaluation of plant biodiversity in forest stands showed that Simpson and Shannon Wiener diversity indices and Ghanaian Margalph index were not statistically significant and Kamenergo and Smith Wilson richness indices and homogeneity indices were not significantly different. Showed. Biodiversity of woody species regeneration in Simpson species diversity indices was highest in Alnus subcordata C.A. Mey and lowest in Cupressus Semprvienes L.Var. horizontails.

کلیدواژه‌ها [English]

  • Plant diversity
  • Regeneration
  • Life form
  • Chorology
  • Forestry
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