بررسی اثر سطح و پراکندگی پلات روی برآورد غنای گونه‏ ای در قالب سه طرح ویتاکر، استولگرن و یک طرح پیشنهادی جدید (آریز)، (مطالعۀ موردی: مراتع گردنۀ آریز سنندج)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار دانشکدۀ منابع طبیعی، دانشگاه کردستان‌

2 دانشجوی کارشناسی ارشد مرتع‌داری، دانشکدۀ منابع طبیعی، دانشگاه کردستان

3 . استادیار دانشکدۀ منابع طبیعی، دانشگاه کردستان‌

چکیده

در مطالعات پوشش گیاهی روش اندازه‏گیری در دقت و صحت نتایج حاصله بسیار اهمیت دارد. بدین منظور برای افزایش دقت در اندازه‏گیری غنای گونه‏ای اقدام به مقایسۀ شکل پلات و پراکنش آن در سطوح مختلف پلات در برآورد غنای گونه‏ای شد. این مقایسه در قالب‌ طرح‌های ویتاکر، استولگرن و یک طرح جدید (آریز) در بخشی از مراتع گردنۀ آریز سنندج انجام گرفت. طرح پیشنهادی (آریز) در این پژوهش حاصل تغییر در ابعاد و پراکندگی زیرپلات‏ها در طرح استولگرن بوده و به‌منظور اندازه‏گیری دقیق‏تر غنای گونه‏ای طراحی شده است. نمونه‏برداری به روش تصادفی سیستماتیک و در تیپ گیاهی علفزار و با سه تکرار برای هر طرح انجام گرفت. ابتدا طرح‏های مقایسه‌شده به‌وسیلۀ پیکه‏های چوبی و طناب در منطقۀ مطالعه‌شده پیاده شد و سپس به شمارش گونه‏ها در داخل پلات‏ها اقدام شد. تجزیه و تحلیل داده‏ها از روش آماری فاکتوریل در قالب طرح‏های کاملاً تصادفی و با استفاده از نرم‌افزار spss نسخۀ 17 انجام شد. نتایج نشان داد که سه طرح یادشده از نظر برآورد غنای گونه‏ای تفاوت معنا‏دار دارند و طرح استولگرن و ویتاکر در سطح 01/0 تفاوت معنادار دارند. طرح ویتاکر و طرح پیشنهادی (آریز) در این مطالعه نیز در سطح 01/0 ‌تفاوت معنادار دارند اما دو طرح استولگرن و آریز در سطح 05/0 ‌تفاوت معنادار دارند.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of surface and Distribution plot of the estimated species richness in three plans Whittaker, Stohlgern and a new proposal (Ariz), (Case study: Ghat ranges Sanandaj)

نویسندگان [English]

  • Bahram Gholinejad 1
  • Fateme Noori 2
  • Hamed Joneidi 3
1 Assistant Professor Faculty of Natural Resource, University of Kurdistan
2 M. Sc. Student in Range Management, Faculty of Natural Resource, University of Kurdistan.
3 Assistant Professor Faculty of Natural Resource, University of Kurdistan.
چکیده [English]

Vegetation studies measuring the accuracy of the results is important. The purpose of this study is to compare shape and distribution plots on different levels for species richness measurements.Thiscomparison was in three design Whittaker, Stohlgern and a new design (Ariz) in Ariz, Sanandaj.Designed proposition (Ariz) obtainedon base changes in the size and distribution plotin design Stohlgern species richness is designed to measure accurately. This study was conducted with three replications in grassland vegetation type. Compare plans were originally wooden and rope was walking in the area, and then proceed to the species in the plots were counted. Data analysis and statistical methods in factorial completely randomized design was performed using spss software version 17.
The results showed that the three estimates of species richness are having a significant difference in the estimation of species richness and Stohlgern plan and Whittaker are significantly different in the level 0.01. Whittaker plans and proposal (Ariz) in this study are the significantly different in the level 0.01 But Stohlgern plan and Ariz design are significantly different in the level 0.05.

کلیدواژه‌ها [English]

  • Species richness
  • Whittaker plot
  • The plot
  • distribution plot
  • Ariz plan

 

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