اثرپذیری ساختار و زی‌توده جنگل‌های ماسال استان گیلان از عامل حفاظت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای علوم زیستی جنگل، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران

2 دانشیار، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران

3 استادیار پژوهش، بخش تحقیقات منابع طبیعی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی چهارمحال و بختیاری، سازمان تحقیقات، آموزش و ترویج کشاورزی، شهرکرد، ایران

4 دانش‌آموخته دکتری، جنگل‌شناسی و اکولوژی جنگل، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران

چکیده

با ثبت جنگل‌های هیرکانی در یونسکو و افزایش حساسیت‌های محیطزیستی، این جنگل‌ها در وضعیت حفاظتی قرار گرفته‌اند. پژوهش پیش‌رو با هدف بررسی اثر حفاظت بر ساختار، زی‌توده و پراکنش قطری جنگل‌های راش آمیخته اسالم در استان گیلان انجام شد. دو پارسل حفاظت‌شده و حفاظت‌نشده در سری پنج حوزه 12 انتخاب، در هر منطقه 50 قطعه‌نمونه 10آری با روش تصادفی- منظم اجرا و قطر و ارتفاع تمام درختان در قطعات اندازه‌گیری شد. پس از محاسبه شاخص‌های کمی متداول، زی‌توده روی زمینی درختان در دو توده با استفاده از روابط آلومتریک برآورد شد. همچنین، پراکنش قطری درختان در دو منطقه با استفاده از هشت تابع توزیع احتمال مدل‌سازی شد. براساس نتایج، میانگین تعداد در هکتار، رویه زمینی و حجم درختان در توده حفاظت‌نشده به شکل معنی‌داری کمتر از توده حفاظت‌شده بود. زی‌توده منطقه حفاظت‌نشده نیز 25/75 تن در هکتار کمتر از منطقه حفاظت‌شده به‌دست آمد. از میان توابع توزیع مورد استفاده، توابع جانسون و بتا در توده حفاظت‌شده و جانسون و گاما در توده حفاظت‌نشده بهترین برازش را با پراکنش قطری درختان نشان دادند. نتایج این پژوهش نشان داد که حفاظت بر ساختار زی‌توده و پراکنش قطری درختان مؤثر بوده و عدم حفاظت بیشترین اثر منفی را بر درختان کم‌قطر داشته است.

کلیدواژه‌ها

عنوان مقاله [English]

Impactability of Structure, and Biomass of Masal Forests of Guilan Province from Conservation

نویسندگان [English]

  • fereshteh moradianfard 1
  • kambiz taheri abkenar 2
  • Yaghoub Iranmanesh 3
  • abouzar heidari safari kouchi 4
1 Faculty of Natural Resources, University of Guilan, Sowme`eh Sara, Iran
2 Faculty of Natural Resources, University of Guilan, Sowme`eh Sara, Iran
3 Research Division of Natural Resources, Chaharmahal and Bakhtiari Agricultural and Natural Resources Research Center, Agriculture Research, Education and Extension Organization (AREEO), Shahrekord, Iran
4 Faculty of Natural Resources, University of Guilan, Sowme`eh Sara, Iran
چکیده [English]

With the registration of Hyrcanian forests in UNESCO and increasing environmental sensitivities, these forests are in a state of conservation. The aim of current study is to investigate the effects of conservation on the structure, biomass and diameter distribution of mixed beech forests of Asalem of Guilan province. For this purpose, two protected and unprotected parcels were selected in a series five of watershed-12. In each area, 50 sample plots were accomplished by randomized systematic method and the diameter and height of all trees in the plots were measured. After calculating the common quantitative indicators, aboveground biomass of trees in the two stands was estimated using allometric equations. Then, the diameter distribution of trees in the two regions was modeled using eight probability distribution functions. Based on the results, the average number per hectare, basal area and volume of trees in non-conserved stands were calculated significantly less than the conserved stand. The biomass of the non-conserved area was 75.25 tons per hectare less than the conserved area. Among the distribution functions used, Johnson and beta functions in the conserved stand and Johnson and gamma in the non-conserved stand showed the best fit with the diameter distribution of the trees. The results of the this study showed that conservation had a significant effect on the biomass structure and diameter distribution of trees and lack of conservation had the greatest negative effect on low-diameter trees.

کلیدواژه‌ها [English]

  • diameter distribution
  • distribution functions
  • conserved stand
  • Hyrcanian forest
  • allometric equations

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سابقه مقاله

  • تاریخ دریافت: 05 اردیبهشت 1400
  • تاریخ بازنگری: 10 شهریور 1400
  • تاریخ پذیرش: 13 شهریور 1400

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