نشریه علمی - پژوهشی مرتع و آبخیزداری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مرتع‌داری، دانشکدة منابع طبیعی و محیط زیست، دانشگاه فردوسی مشهد

2 استادیار گروه مرتع و آبخیزداری،دانشکده منابع طبیعی و محیط زیست،دانشگاه فردوسی مشهد

3 مربی گروه مرتع و آبخیزداری، دانشکدة منابع طبیعی و محیط زیست، دانشگاه فردوسی مشهد

4 استاد مدعو، دانشکدة منابع طبیعی و محیط زیست، دانشگاه فردوسی مشهد

چکیده

چون اندازه‏گیری تراکم گیاهان، اغلب، به کمک پلات و در اکثر موارد به روش شمارش پایه‏ها صورت می‏گیرد، اندازه و شکل پلات از نخستین مواردی است که باید دربارة آن تصمیم‌گیری شود. در این تحقیق اثر اشکال و سطوح مختلف پلات بر دقت و صحت نمونه‏گیری به ‏منظور برآورد تراکم گیاه گون خاردار‌ـ که یکی از گونه‏های غالب در منطقه و دارای پایه‏های مجزا از هم است‌ـ در منطقة مایان مشهد بررسی شد. اشکال مختلف پلات به ترتیب مربع، مستطیل پهن، مستطیل کشیده و سطوح مختلف پلات 1، 2، 4، و 8 متر مربع درنظر گرفته شد. در مجموع، 3×4 نوع پلات (تیمار) بررسی شد. در این تحقیق مختصات هر یک از پایه‏های گون خاردار و مرز منطقه مطالعه و با دوربین دیجیتال برداشت شد و به کمک نرم‌افزارR  نقشة دیجیتال پراکنش گون‏ در منطقة مورد نظر رسم شد. با توجه به نتایج به‌دست‌آمده در این پژوهش، پلات مستطیل کشیده 5/0×8 متر بیشترین دقت و صحت را دارا بود و پلات بهینه انتخاب شد. در نهایت، می‌توان نتیجه گرفت که به منظور صرفه‌جویی در وقت و هزینه جهت نمونه‌برداری در عرصه، استفاده از روش مکان‌یابی پایه‌های گیاهی و کاربرد نرم‌افزار R می‌تواند روش مناسبی برای برآورد تراکم گیاهان بوته‌ای باشد و می‌توان از پلات‏های بهینه در این پژوهش برای بوته‌زارهای مشابه استفاده کرد.

کلیدواژه‌ها

عنوان مقاله [English]

Optimization of sample unit’s shape and size to enhancing precision and accuracy of density estimation of Astragalus verus in Mayan rangeland, Mashhad

نویسندگان [English]

  • zahra zangane 1
  • Kamalaldin Naseri 2
  • Fereydoon Mellati 3
  • Mansoor Mesdaghi 4

1 M.Sc Student, Department of Range and Watershed Management, Faculty of Natural Resources and Environment, Ferdowsi University of Mashhad, Iran

2 Assistant Professor, Department of Range and Watershed Management, Faculty of Natural Resources and Environment, Ferdowsi University of Mashhad, Mashhad, Iran

3 Teaching Assistant, Department of Range and Watershed Management, Faculty of Natural Resources and Environment, Ferdowsi University of Mashhad, Mashhad, Iran

4 Professor, Department of Range and Watershed Management, Faculty of Natural Resources and Environment, Ferdowsi University of Mashhad, Iran

چکیده [English]

Because plant density is often measured by using plots and also in most cases are done by the method of estimation and counting the individuals, so one of the important cases that we have to decide on is the size and shape of plot. In this research, the density of Astragalus verus that it's one of the dominate species in the area and has separate and recognizable individuals plant from each other,for investigate the effects of different size and shape of plots on sampling precision and accuracy are estimated in Mayan Mashhad area. The shapes of plot are square, wide rectangular, long rectangular, and sizes of plot are 1, 2, 4, and 8 m2 respectively, that we have been investigated in total 3x4 plots (treatments). In this research, the coordinates of individual plants and the boundary of study area are located by using digital camera. Then, with help of R software, the digital map of study area was sketched. The results show that long rectangular 0.5x4 m plot has the highest accuracy and precision, so it is selected as optimum plot. Finally, it can be concluded that for saving time and expenses in sampling, using of locating coordinates method of individual plants and application of R software can be appropriate approach for estimating the density of shrublands, so for similar shrublands, the optimum plot of this research (4x0. 5 m) can be used.
 

کلیدواژه‌ها [English]

  • plot shape
  • Plot size
  • precision
  • Accuracy
  • Density
  • R software
 

 

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