اثر نشانه‌گذاری بر پراکنش و ساختار توده‌های جنگلی راش (پژوهش موردی جنگل صفارود رامسر)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 کارشناس ارشد جنگلداری، دانشگاه آزاد اسلامی

2 کارشناس ارشد جنگلداری، موسسه تحقیقات جنگلها و مراتع کشور

3 هیات علمی دانشگاه آزاد اسلامی

چکیده

این مطالعه با هدف بررسی الگوی پراکنش مکانی درختان نشانه‌گذاری‌شده در دو پارسل 513 و 514 از سری پنج صفارود رامسر واقع در ارتفاع 1200 تا 1300 متر از سطح دریا در جنگل‌های حوزه آبخیز 30 انجام شد. برای این منظور، 20 پلات یک هکتاری براساس روش نمونه‌برداری از دو جامعه مستقل راش شامل پلات‌های مدیریت‌شده (16 هکتار) و پلات‌های شاهد (جهار هکتار) در نظر گرفته شد و اطلاعات موجود در سال‌های 1379 و 1391 در آنها مقایسه شدند. نتایج نشان داد که ساختار 20 پلات در سال 1379 نزدیک به حالت تعادل (نامنظم) بوده است و برش‌های تک‌گزینی انجام‌شده در این توده‌ها منحنی سال 1391 را از فرم تعادل دور کرده است. تعداد درختان قطور و خیلی قطور کاهش یافته و در طبقات قطری پایین نیز کاهش تعداد به‌وجود آمده است. الگوی پراکنش مکانی درختان نشانه‌گذاری‌شده در پارسل 512 به‌طور کامل خوشه‌ای (پراکنده در اطراف درختان قطور و خیلی قطور) و در پارسل 513 تصادفی (پراکنده در اطراف کم‌قطر و میان‌قطر) است که ارتباط مستقیم با تیپولوژی توده جنگلی دارد. همچنین نتایج نشان داد که متوسط سطح روشنه‌های زادآوری در جامعه مدیریت‌شده 414 مترمربع و در جامعه شاهد 384 مترمربع، متوسط ارتفاع کل نهال‌ها در روشنه‌‌های زادآوری موجود در جامعه مدیریت‌شده 1/4 متر و در شاهد 1/2 متر و میانگین تعداد نهال در جامعه مدیریت‌شده 603 اصله و در شاهد 512 اصله در هر آر بود که با هم اختلاف معنی‌داری را نشان ندادند.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of marking on the spatial distribution and structure of beech stands (Case study: Safarood-Ramsar)

نویسندگان [English]

  • Mohammad Sadegh Rahimian 1
  • Majid Hassani 2
  • Hadi Kiadaliri 3
1 M. Sc. Forestry, Islamic Azad University, Science and Research Branch, Tehran, I.R. Iran. ‎
2 Research Expert, Forest Research Division, Research Institute of Forest and Rangelands, Tehran, ‎I.R. Iran.‎
3 Assistant Prof., Department of Forestry, Islamic Azad University, Science and Research Branch, Tehran, ‎I.R. Iran. ‎
چکیده [English]

This paper aims to study the spatial pattern of marked trees in compartments 513 and 514 of district five of Safarood Ramsar which is located between 1200 and 1300 m.a.s.l. in the watershed management unit 30. For this purpose, twenty, 1ha sample plots were selected based on two independent communities, 16 plots in managed and 4 plots in unmanaged (control) stands, and the data on 2000 and 2012 were compared. Results showed that the structure of the 20 plots on 2000 was irregular and the selection cuttings within 12 years have made ​​some effects on the structure in 2012 which is now a bit far from irregular form. The number of trees in small, large and extra large diameter classes is reduced. The spatial pattern of marked trees in the compartment 512 showed cluster pattern (located around large and extra large timber), whereas in the compartment 513 was random (located around small and medium timber) which is directly related to the typology of the stands. Moreover, the results indicated that the mean area of gaps in the managed and control stands was 414m2 and 284m2, respectively. Mean total height of seedlings was 1.4m and 1.2m in the managed and control stands, respectively. Mean seedlings number in the managed and control stands was 603 and 512 in 100 m2, respectively. None of the differences of above mentioned data were statistical significant.

کلیدواژه‌ها [English]

  • Spatial pattern
  • selection cutting
  • random
  • Cluster
  • Gap
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