بررسی ساختاری ترکیب فلور در گرادیان ارتفاعی مراتع قزل‌اوزن – ارتفاعات شهرستان کوثر، استان اردبیل

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مرتعداری، دانشکده‌ کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران

2 استادیار گروه مرتع و آبخیزداری، دانشکده‌ کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران

3 استادیار پژوهشی، بخش تحقیقات جنگل‌ها، مراتع و آبخیزداری، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان گیلان، سازمان تحقیقات، آموزش و ترویج کشاورزی (AREEO)، رشت، ایران

4 دانشجوی دکتری علوم و مهندسی مرتع، دانشکده‌ کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

هدف پژوهش حاضر، بررسی ساختار ترکیب فلور در پروفیل ارتفاعی 937 تا 2162 متر از سطح دریا، در طول
29 کیلومتر مراتع قزل‌اوزن تا ارتفاعات شهرستان کوثر بود. 8 رویشگاه و در هریک، 3 ترانسکت 100 تا 500 متری با 10 پلات متغیر 1 تا 25 مترمربعی انتخاب شدند. گونه‌ها از سطح پلات‌ها جمع‌آوری، شناسایی و شکل رویشی، پایداری، پراکنش جغرافیایی و حفاظتی آنها تعیین شد. نتایج نشان دادند 32 تیره، 101 جنس و 146 گونه در رویشگاه‌های انتخاب‌شده گسترش دارند. خانواده‌های Asteraceae با 39 گونه (27 درصد)، Poaceae با 18 گونه (13 درصد)، Fabaceae با 13 گونه (9 درصد) و جنس‌های Astragalus با 8 گونه (48/5 درصد) و Centaurea با
5 گونه (42/3 درصد) مهم‌ترین عناصر فلور منطقه‌اند. بازدانگان 1 گونه، نهان‌دانگان دولپه‌ای 27 تیره، 82 جنس و 124 گونه و نهان‌دانگان تک‌لپه‌ای 4 تیره، 18 جنس و 21 گونه دارند. بیشترین و کمترین نسبت تیره به جنس به‌ترتیب در ارتفاع 1583 تا 1683 متری با نسبت 27/1:3 و 2139 تا 2162 متری با نسبت 92/1:1 دیده می‌شود. نسبت تیره به گونه در ارتفاع 1583 تا 1683 متری برابر 91/1:3 و در ارتفاع 1635 تا 1677 متری برابر 11/1:2 و نسبت جنس به گونه در ارتفاع 1568 تا 1609 متری برابر 30/1:1 و در ارتفاع 937 تا 965 متری برابر 03/1:1 است. پهن‌برگان علفی با 105 گونه (72 درصد) شکل رویشی غالب و تروفیت‌ها با 62 گونه (43 درصد) فراوان‌ترین شکل زیستی هستند. 69 گونه (47 درصد) به ناحیۀ ایرانی - تورانی تعلق دارد. 14 گونه انحصاری ایران، 8 گونه با خطر کم و 2 گونه آسیب‌پذیر است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Structural Analysis of Flora Composition in Altitudinal Gradient of QezelOzan - Kosar Altitudes rangelands, Ardabil province

نویسندگان [English]

  • MirMilad Taheri Niari 1
  • Ardavan Ghorbani 2
  • Mahmood Bidar lord 3
  • Sahar Ghafari 4
1 M. S. Student of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran
2 Assistant Professor Department of Agronomy and Natural Resources, University of Mohaghegh Ardabili
3 3Assistant Professor of Forests and Rangelands Research Department, Guilan Agricultural and Natural Resources Research and education Center, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran
4 Ph. D. Student of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Irani
چکیده [English]

Abstract
The aim of this study was to investigate the structure of flora composition in the elevation profile of 937-2162m a.s.l. over 29 Km in the QezelOzan to the altitudes of Kosar county rangelands. Eight habitats and in each three 100 to 500m transects with 10 plots varied from 1 to 25 m2 were selected. Species were collected from the plots, and life forms, growth types and their geographical distribution and conservation were determined. Results show that 32 families, 101 genera and 146 species are distrbuted at the selected areas. Asteraceae families with 39 species (27%), Poaceae with 18 species (13%), Fabaceae with 13 species (9%), Astragalus with 8 species (48.5%) and Centaurea with 5 species (42.3%) are the most important elements of the flora. Spermatophyta with 1 species, angiospermae dicotyledoneae with 27 families, 82 genera and 124 species, and angiospermae monocotyledoneae have 4 families, 18 genera and 21 species. Respectively, the highest and lowest ratio of the family to the genera is at 1583-1683m 1:3.27 and 2139-2162m 1:1.92; the ratio of the family to the species is at 1583-1683m 1:3.91 and 1635-1677m 1:2.11; and ratio of the genera to the species is at 1568-1609m 1:1.30 and 937-965m 1:1.03. For bs with 105 species (72%) is the dominant growth type and trophytes with 62 species (43%) is the most abundant life form. Sixty nine species (47%) belong to the Iranian-Turanian region. Also, 14 native species of Iran, 8 low risk species and 2 vulnerable species are distributed at the study area.

کلیدواژه‌ها [English]

  • Biodiversity
  • Geographical distribution
  • Species Diversity
  • Native Species

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