تعیین حداقل سطح مناسب بررسی الگوی پراکنش مکانی برودار (Quercus brantii Lindl.) در توده های کمتر دخالت‌شده جنگل‌های مریوان با استفاده از تابع K رایپلی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد جنگلداری، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، تهران، ایران

2 استادیار پژوهشی، بخش تحقیقات جنگل، مؤسسۀ تحقیقات جنگل‌ها و مراتع کشور، تهران، ایران

3 استادیار، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، تهران، ایران

چکیده

جنگل‌های ناحیۀ رویشی زاگرس امروزه به‌علت قطع بی‌رویه و چرای مفرط غالباً به حالت مخروبه درآمده‌اند، ولی با‌این‌حال هنوز می‌توان مناطقی را یافت که به‌دلایل گوناگونی، چون دور از دسترس‌بودن یا مقدس‌بودن، کمتر تخریب شده‌اند. از این مناطق می‌توان به‌عنوان مناطق شاهد یا الگو در مدیریت و برنامه‌ریزی سایر مناطق جنگلی استفاده کرد. در این پژوهش به نحوة پراکنش درختان در سطح افق (الگوی مکانی)، که از ویژگی‌های شاخص توده‌های جنگلی است، و نیز تعیین حداقل سطح مناسب برای بررسی آن، پرداخته شده است. بدین‌منظور سه سطح یک‌هکتاری جنگلی به ابعاد 100  ´100 متر در سه منطقۀ کمتر‌دخالت‌شده (قبرستان) در اطراف شهرستان مریوان انتخاب شدند که گونة غالب آن‌ها برودار بود. در داخل هر یک از این سطوح یک‌هکتاری، سه سطح مربع‌شکل دیگر به‌ترتیب با مساحت‌های 25/0، 5/0، و 75/0 هکتار به‌صورت تودرتو اجرا شد. سپس، موقعیت مکانی کلیۀ درختان در داخل قطعات یک‌هکتاری به‌روش فاصله‌ـ‌آزیموت تعیین و الگوی پراکنش مکانی درختان با استفاده از تابع K رایپلی به‌تفکیک قطعات مختلف بررسی شد. نتایج نشان داد که الگوی پراکنش مکانی درختان جز برای سطح 25/0 هکتار، کپه‌ای، و حداقل سطح مناسب برای این بررسی، 5/0 هکتار است.


 

کلیدواژه‌ها


عنوان مقاله [English]

Determining the Minimum Plot Size to Study the Spatial Patterns of Manna Oak Trees (Quercus brantii Lindl.) Using Ripley›s K- Function at Less-Disturbed Stands in Marivan Forests

نویسندگان [English]

  • Parisa Batoubeh 1
  • Reza Akhavan 2
  • Mahdi Pourhashemi 2
  • Hadi Kia-Daliri 3
1 M.Sc.Student, Islamic AzadUniversity, Science and Research Branch, Tehran, I.R. Iran
2 Assistant Professor, Forest Research Division, Research Institute of Forests and Rangelands, Tehran, I.R. Iran
3 Assistant Professor, Islamic AzadUniversity, Science and Research Branch, Tehran, I.R. Iran
چکیده [English]

Nowadays, the Zagros forests are being destroyed due to over pollarding and overgrazing of
the trees. However, some less-disturbed and wild regions can be found in these forests that
have not been destroyed due to being un-accessible or being a holy place. These regions can
be used as a suitable standard for planning and managing the other forest areas. In this study,
we investigated one of the indicator characteristics of the forest stands, i.e., spatial patterns of
trees, and determined the suitable plot size to study it. For this purpose, 3 one-hectare (100 m
× 100 m) nested plots with areas of .25, .5, and .75 of ha in less-disturbed stands were selected.
Coordinates of all trees were determined using azimuth-distance method, and the spatial point
pattern was analyzed through Ripleyls K- function for each nested plots, individually. The
results showed that the spatial patterns of the trees in all nested plots, except for the .25 ha,
were clustered, and the minimum plot size to study the spatial patterns in such forest stands
was .5 hectare.

کلیدواژه‌ها [English]

  • less-disturbed stand
  • Plot size
  • Ripley's K- function
  • spatial pattern
  • Zagros
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