کارآیی شاخص ­های فاصله­ ای و تراکمی در برآورد الگوی مکانی درختان در جنگل (مطالعه موردی: جنگل تحقیقاتی بنه، استان فارس)

نوع مقاله : علمی- پژوهشی

نویسندگان

1 استادیار، دانشکده کشاورزی دانشگاه شیراز

2 دانشجوی کارشناسی ارشد، مدیریت مناطق بیابانی، واحد بین الملل دانشگاه شیراز

3 استادیار پژوهش، اداره کل منابع طبیعی و آبخیزداری استان فارس

چکیده

در مدیریت جنگل، آگاهی از ویژگیهای زیست‌شناختی و بوم‌شناختی درختان در یک توده از اهمیت بالایی برخوردار است. نخستین گام در کسب این آگاهی، شناخت الگوی مکانی درختان است. بنابراین برای برآورد سریع و قابل اطمینان پراکنش مکانی درختان، باید از روشهای مناسب بهره برد. این پژوهش با هدف بررسی مقایسه‌ای شاخص‌های مهم و پرکاربرد فاصله‌ای و تراکمی در برآورد الگوی مکانی درختان انجام شد. برای این منظور یک توده خالص از درختان بنه در جنگل تحقیقاتی بنه استان فارس آماربرداری صددرصد شد. با استفاده از روش نزدیکترین همسایه، الگوی مکانی مطلق درختان تعیین شد. سپس با برآورد توزیع مکانی درختان با استفاده از شاخص‌های مورد نظر، کارایی هر یک از آنها ارزیابی شد. الگوی مکانی مطلق درختان بنه در توده مورد بررسی، کپه‌ای تعیین شد. نتایج نشان داد از بین شاخص­های تراکمی مورد بررسی، تنها دو شاخص پراکنش و ضریب ناهمگنی نتوانستند الگوی مکانی کپه‌ای درختان بنه را تشخیص دهند. همچنین تنها دو شاخص ابرهارت و هینز در بین شاخص­های فاصله‌ای بکار رفته توانستند الگوی مکانی کپه‌ای درختان بنه را برآورد نمایند. به‌طور کلی، در این پژوهش شاخص­های تراکمی به‌مراتب بهتر از شاخص­های فاصله‌ای عمل کردند که این موضوع باید در مطالعات آینده روی توده‌های خالص بنه مورد توجه قرار گیرد.

کلیدواژه‌ها

عنوان مقاله [English]

The efficiency of distance- and density-based indices in estimating the spatial pattern of trees in forests (Case study: Wild Pistachio Research Forest, Fars province, Iran)

نویسندگان [English]

  • Yousof Erfanifard 1
  • Fatemeh Mahdian 2
  • Rashid Fallah Shamsi 1
  • Kazem Bordbar 3
1 Assistant Prof., Faculty of Agriculture, Shiraz University
2 .Sc. student, Dept. of Desert Management, International Unit, Shiraz University
3 Assistant Prof., General Office of Natural Resources and Watershed Management of Fars Province, Shiraz
چکیده [English]

It is so important to know about biological and ecological characteristics of trees of a stand, in forest management. The first step to achieve this knowledge is to recognize the spatial pattern of trees. So it is necessary to apply suitable methods to have a reliable and quick estimation of the spatial distribution of trees. This research was aimed to compare the important and mostly applied distance- and density-based indices, utilized to estimate the spatial pattern of trees. For this purpose, a pure wild pistachio stand was full-callipered in Fars Wild Pistachio Research Forest, Iran. The true spatial pattern of the trees was determined by nearest neighbor method. The efficiency of each index was then evaluated by estimating the spatial distribution of the trees, utilizing the indices. The true spatial pattern of the wild pistachio trees in the studied stand was clumped. The results showed that only the two density-based indices of “dispersion” and “heterogeneity factor” could not detect the clumped pattern of wild pistachio trees among the investigated indices. The two distance-based indices of “Eberhardt” and “Hines” could estimate the clumped pattern of the wild pistachio trees among the applied indices as well. In general, the density-based indices performed much better than the distance-based indices in this research and this conclusion should be considered in the future studies on pure wild pistachio stands

کلیدواژه‌ها [English]

  • Spatial pattern
  • wild pistachio
  • density-based indices
  • distance-based indices

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