گیاگان و تنوع گونه‌های گیاهی در جنگل‌های دست‌کاشت سوزنی‌برگ و پهن‌برگ (پژوهش موردی: ریمله، استان لرستان)

نوع مقاله : علمی- پژوهشی

نویسندگان

1 کارشناس ‌ارشد جنگل‌داری، دانشکده کشاورزی و منابع طبیعی، دانشگاه لرستان

2 استادیار، گروه جنگل‌داری، دانشکده کشاورزی و منابع طبیعی، دانشگاه لرستان

3 استادیار، گروه خاکشناسی، دانشکده کشاورزی و منابع طبیعی، دانشگاه لرستان

4 دانشجوی دکتری سیستماتیک گیاهی، دانشکده علوم، دانشگاه تهران

چکیده

پژوهش پیش‌رو به‌منظور بررسی گیاگان و تنوع گونه‌های گیاهی در جنگل دست‌کاشت 20 ساله ریمله خرم‌آباد استان لرستان با دو توده سوزنی‌برگ کاج بروسیا (Pinus brutia Ten.) و سرو نقره‌ای (Cupressus arizonica Green.) و یک توده پهن‌برگ بادام کوهی (Amygdalus scoparia Spach.) انجام شد. در هر توده 10 قطعه‌نمونه 100 متر مربعی و درمجموع 30 قطعه‌نمونه به‌طور تصادفی پیاده شد. سپس در مرکز و چهار گوشه آنها ریزقطعه‌نمونه‌های 2/5×2/5 متر مربعی درنظر گرفته شد (درمجموع 150 ریزقطعه‌نمونه) و تعداد گونه‌های علفی شمارش و درصد تاج‌پوشش آنها ثبت شد. نتایج نشان داد که گیاگان منطقه شامل 24 خانواده، هشت جنس و 93 گونه گیاهی بود. مهم‌ترین خانواده‌های گیاهی عبارت بودند از: Asteraceae (18 گونه)، Fabaceae (17 گونه)، Poaceae (12 گونه)، Apiaceae و Caryophyllaceae (هر کدام با شش گونه). ازنظر شکل زیستی، تروفیت‌ها با 64/5 درصد بیشترین درصد گونه‌های گیاهی منطقه را تشکیل می‌دادند. بررسی کوروتیپ گونه‌ها نشان داد که گونه‌های انحصاری ناحیه رویشی ایران- تورانی بیشترین فراوانی (36/5 درصد) را به‌خود اختصاص داده‌اند. همچنین شاخص تنوع شانون- وینر و غنای گونه‌ای در توده‌های سوزنی‌برگ بیشترین مقدار را داشت و ازنظر شاخص یکنواختی هیل اصلاحی، بین سه توده اختلاف معنی‌داری مشاهده نشد.

کلیدواژه‌ها

عنوان مقاله [English]

Flora and plant species diversity in coniferous and deciduous plantations (Case study: plantation of Remela, Lorestan)

نویسندگان [English]

  • Zahra Jamshidnia 1
  • Kambiz Abrari Vajari 2
  • Akbar Sohrabi 3
  • Gholam Hasan Veiskarami 4
1 M.Sc. Forestry, Department of Forestry, Faculty of Agriculture and Natural Resources, Lorestan University
2 Assistant Prof., Department of Forestry, Faculty of Agriculture and Natural Resources, Lorestan University
3 Assistant Prof., Department of Soil Sciences, Faculty of Agriculture and Natural Resources, Lorestan University
4 Ph.D. Student Plant Systematic, Faculty of Science, University of Tehran
چکیده [English]

The purpose of this study was to investigate flora and plant species diversity in a mixed plantation in western Iran. Therefore, a 20-year mixed coniferous and deciduous plantation (Pinus brutia Ten., Cupressus arizonica Green. and Amygdalus scoparia Spach) was selected in Remela region, Lorestan province. In each of the three stands, 10 plots of 100 m2 (10 ×10m) each were randomly established, in each of which 5 subplots (2.5 ×2.5 m)  were positioned in center and corner points. Plant species cover (%) and diversity indices were calculated for each site. Totally, 93 plants from 24 families and 8 genera were identified. The results showed that the main families included Asteraceae (18 species), Leguminosae (17 species), Labiatae (13 species), Graminae (12 species), and Apiaceae / Caryophyllaceae (6 species). The most frequent life form was therophytes (64.51%).  From the chorotypical perspective, the highest frequency belonged to Irano-Turanian region (36.55 %(. The result also indicated that Shanon-weaver's diversity index and species richness (SR) were higher in coniferous plantation compared to the deciduous one, yet no significant difference was observed among the Hill's evenness indices of the three test sites. All in all it can be concluded that the habitats are associated with a high diversity due to the presence of 93 species, which is presumably driven by the climate and geomorphologic conditions of the region.

کلیدواژه‌ها [English]

  • Biodiversity
  • Zagros
  • Flora

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