نشریه علمی - پژوهشی مرتع و آبخیزداری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مرتع و آبخیزداری و عضوگروه پژوهشی خشکسالی و تغییر اقلیم، دانشکده منابع طبیعی و محیط زیست، دانشگاه بیرجند، بیرجند، ایران

2 مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

10.22059/jrwm.2023.357691.1701

چکیده

این تحقیق در مرتعی از نوع قرق با چهار رویشگاه Artemisia sieberi، Zygophyllum eurypterum، Stipa barba و Amygdalus scoparia در منطقه حفاظت شده شاسکوه، استان خراسان جنوبی انجام شد. کلیه گونه‌های گیاهی مرتع شناسایی و در 200 پلات شمارش شد، به علت متفاوت بودن فرم رویشی و نحوه پراکنش هر کدام از گونه‌های غالب، در هر کدام از چهار رویشگاه، به ترتیب، 20، 40، 60 و 80 عدد پلات با دو اندازه 2×2 متر و 4×4 متر ( هر کدام 60 پلات) مستقر شد. جهت ارزیابی و مقایسه تنوع زیستی از شاخص‌های عددی و منحنی‌های رتبه‌بندی تنوع استفاده شد. از منحنی‌های جزء نادر انفرادی و تجمعی به ترتیب جهت مقایسه غنای گونه‌ای و تعیین کفایت نمونه‌برداری استفاده شد. نتایج نشان داد که غنای کل براساس شاخص‌های عددی بین ۵۱ تا ۵۴ گونه متغیر است. رویشگاه با 80 پلات، بیشترین غنا و تنوع گونه‌ای (43S= و 27/3 H=) و 20 پلات کمترین غنا و تنوع (6S= و 41/1 H=) را دارد. نتایج تحلیل SHE نشان دادکه با افزایش تعداد پلات، یکنواختی گونه‌ای کاهش پیدا کرد. منحنی جزء نادر نشان داد که با افزایش تعداد پلات به ۱۱۰، کل گونه‌های گیاهی موجود در منطقه مشاهده خواهد شد. با افزایش اندازه پلات، کلیه مقادیر غنا و تنوع گونه‌ای افزایش معنی‌داری پیدا کردند ( 01/0p≤). شاخص‌های یکنواختی تحت تاثیر اندازه پلات قرار نگرفتند. نتایج تحقیق حاضر نشان داد شاخص‌های عددی غنا و تنوع گونه‌ای وابسته به اندازه پلات هستند و این از معایب ارزیابی تنوع زیستی در مراتع با استفاده از شاخص‌های عددی است.

کلیدواژه‌ها

عنوان مقاله [English]

Investigating the effect of the sample size and plot size on the numerical indices of rangeland biodiversity

نویسندگان [English]

  • Moslem Rostampour 1
  • Alireza Eftekhari 2

1 Department of Rangeland and Watershed Management and Research Group of Drought and Climate Change, Faculty of Natural Resources and Environment, University of Birjand, Birjand, Iran

2 Rangeland Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran

چکیده [English]

This research was carried out in an enclosure rangeland with four habitats of Artemisia sieberi, Zygophyllum eurypterum, Stipa barba and Amygdalus scoparia in the Shaskouh protected area, South Khorasan province. All the plant species of the rangeland were identified and counted in 200 plots, due to the different vegetation form and distribution of each of the dominant species, in each of the four habitats, 20, 40, 60 and 80 plots (respectively) were established with two plot size: 2 × 2 meters and 4 × 4 meters (60 plots each). Numerical indices and diversity ordering curves were used to compare four habitats. Alpha and gamma species richness were determined by numerical indices and single sample rarefaction and pooled rarefaction curves were used to compare species richness and determine data adequacy. The results showed that the total species richness (gamma) varies between 51 and 54 species. The habitat with 80 plots has the highest richness and diversity (S=43 and H=3.27) and 20 plots has the lowest richness and diversity (S=6 and H=1.41). The results of SHE analysis showed that with the increase in the number of plots, species evenness decreased. The pooled refraction curve showed that by increasing the number of plot to 110, all plant species will be observed. With the increase in plot size all values of species richness and diversity indices increased significantly (p≤0.01). Species evenness indices were not affected by plot size. The results of the present research showed that the numerical indices of species richness and diversity are dependent on plot size, and this is one of the disadvantages of evaluating biodiversity in rangeland using numerical indices.

کلیدواژه‌ها [English]

  • Sample size
  • Diversity profile
  • Refraction
  • Numerical index
  • Species richness
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