ارزیابی روش‌ میکروپلات برای برآورد تراکم زادآوری گیلاس وحشی (‏Prunus avium L.‎‏)‏

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد جنگلداری، دانشکده منابع طبیعی، دانشگاه یزد، یزد، ایران ‏

2 دانشیار گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه یزد، یزد، ایران ‏

چکیده

هدف این پژوهش، بررسی دقت و صحت روش میکروپلات منفرد در برآورد زادآوری گونه­ نادر گیلاس وحشی و معرفی روش جایگزین بوده است. برای این منظور، ابتدا با انجام جنگل­گردشی، سه پارسل­ از سری هفت شفارود که دارای درختان مادری و زادآوری طبیعی گیلاس وحشی بودند، انتخاب شدند. تعداد 50 قطعه نمونه­ دایره­ای هریک به مساحت 1000 متر مربع، به­صورت منظم تصادفی، در شبکه­ای به ابعاد 200×150 متر برداشت شد. در هر قطعه نمونه، چهار میکروپلات، هریک به شعاع دو متر مشخص و نهال‌های گیلاس وحشی موجود در آن­ها، که ارتفاع کمتر از 30/1 متر داشتند، شمارش شدند. در هر قطعه نمونه، یک ترانسکت به عرض 2/0 و طول 10 متر نیز مشخص و نهال‌های گیلاس وحشی موجود در آن شمارش شد. در مساحت 10000 متر مربع مشتمل بر 10 قطعه نمونه، کلیه نهال‌های گیلاس وحشی شمارش و تراکم به­دست آمده، به­عنوان شاهد در نظر گرفته شد. بر اساس نتایج، خطای نمونه­برداری در روش میکروپلات خوشه­ای حداقل (69/18 درصد) و در روش ترانسکت حداکثر (62/45 درصد) بود. همچنین، روش میکروپلات خوشه­ای بیشترین صحت (72/15 درصد) و روش ترانسکت کمترین صحت (74/111 درصد) را در برآورد تراکم داشت. آزمون t تک نمونه نشان داد که اختلاف معنی‌داری بین روش‌های نمونه­برداری ترانسکت عریض و میکروپلات منفرد با شاهد در سطح پنج درصد وجود دارد. درحالی که روش میکروپلات خوشه­ای از نظر آماری اختلافی با شاهد نداشت. از این­رو، روش میکروپلات خوشه­ای نسبت به میکروپلات منفرد، به­واسطه برآورد دقیق­تر و صحیح­تر زادآوری گونه­های نادری مانند گیلاس وحشی، ارجحیت دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluating the microplot method to estimating the regeneration density of wild cherry ‎‎(Prunus avium L.)‎

نویسندگان [English]

  • Kiyan Yegandoost 1
  • Bahman Kiani 2
1 M.Sc. Student of Forestry, Department of Environment, Faculty of Natural Resources, Yazd University, Yazd, ‎I.R. Iran
2 Associate Professor, Department of Environment, Faculty of Natural Resources, Yazd University, Yazd, I.R. Iran
چکیده [English]

The aim of this study was to investigate the accuracy and precision of single microplot method in estimating the regeneration of wild cherry and introducing an alternative method. For this purpose, after a primary survey, three parcels in district-7 from Shafarood basin, which had mother trees and wild cherry regeneration, were selected. A total of fifty circular plots were taken randomly, in a 150×200 m grid, each 1000 m2 area. Four microplots were measured at a radius of 2 m and all the cherry seedlings were counted. A transect, 0.2 m wide and 10 m long was layed in each plot and all of the cherry seedlings under 1.3 m height were counted. In an area of 10,000 m2, including 10 randomly selected plots, all wild cherry seedlings were counted and calculated density was considered as control. Based on the results, the sampling error in the clustered-microplot method was minimal (18.69%) and in the transect method was maximum (45.62%). In terms of the accuracy, the clustered-microplot method had the highest accuracy (15.72%) and transect method had the least accuracy (111.74%) in density estimates. One-sample t-test showed that there is a significant difference between transect and single-microplot methods with the control in 5% confidence level, while the clustered-microplot was not statistically different. It can be said that the clustered-microplot method is more superior than single-miroplot method and is preferable for accurate and precise estimation of regeneration for rare specieses like wild cherry.  

کلیدواژه‌ها [English]

  • Plot
  • Regeneration
  • sampling
  • Seedling
  • Shafarood
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