تأثیر شدت برداشت در شیوه جنگل‌شناسی تک‌گزینی بر زیست‌توده انجیلی- ممرز

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری جنگل‌شناسی و اکولوژی جنگل، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی، گرگان، ایران‏

2 دانشیار، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی، گرگان، ایران‏

3 استاد، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی، گرگان، ایران

4 دانشیار، دانشکده منابع طبیعی نور، دانشگاه تربیت مدرس، ایران‏

چکیده

تأثیر ورود به جنگل و بهره‌برداری درختان بر ساختار آینده و عملکرد اکولوژیکی جنگل‌های هیرکانی موضوعی مورد بحث است. اطلاعات موجود در خصوص تأثیر شدت برداشت بر خصوصیات توده و مثل زیست‌توده اندک است. مقاله حاضر باهدف تعیین تأثیر شدت بهره­برداری درختان توده انجیلی- ممرز در شیوه تک­گزینی بر زیست­توده انجام شده است. به­این منظور در 70 قطعه‌نمونه نیم هکتاری اطلاعات کلیه درختان و خشک‌دارها برداشت شد. تعداد 35 قطعه‌‌نمونه در توده برداشت‌شده به شیوه تک­گزینی با سه شدت برداشت قرار داشتند و معادل همین تعداد قطعه‌نمونه در توده کنترل بودند. لاشریزی درختان طی شش ماه از شهریور تا بهمن برداشت شد و ذخیره کربن آلی خاک از طریق اندازه‌گیری کربن آلی و وزن‌مخصوص‌ظاهری خاک تعیین شد. سپس زیست‌توده درختان، لاشریزه، خشک‌دار، ریشه، خاک و در نهایت زیست­توده کل محاسبه شد. نتایج نشان داد که با افزایش شدت‌برداشت تا 5/13 درصد روند تغییرات زیست‌توده کل افزایشی است هرچند شدت‌برداشت تأثیر معنی‌داری بر زیست­توده روی‌زمینی، زیرزمینی و کربن آلی خاک نداشت. زیست­توده روی‌زمینی در توده تک­گزینی بیشتر از توده کنترل بود. میانگین زیست­توده کل در توده برداشت‌شده انجیلی ممرز 147 و در توده کنترل 144 تن در هکتار بود و برداشت به­طور متوسط دو درصد زیست­توده کل را افزایش داد. در نهایت با توجه به نتایج این پژوهش شدت برداشت متوسط (5/9-6/3 درصد حجم سرپا) به­عنوان شدت برداشت مناسب تعیین شد. تشابه وضعیت زیست­توده لاشریزه و خشک‌دار در دو توده به­عنوان شاخص زیستی، گویای مناسب بودن شرایط نشانه­گذاری در شیوه تک­گزینی بود.

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of harvesting intensity in single-tree selection on biomass of hornbeam - ‎Persian ironwood stand

نویسندگان [English]

  • Mahmoud Radaee 1
  • Hashem Habashi 2
  • Ramin Rahmani 2
  • Shaban Shataee 3
  • Hormoz Sohrabi 4
1 Ph.D. Student of Silvicultural and Forest Ecology, Faculty of Forest Sciences, Gorgan University of ‎Agricultural Sciences and Natural Resources, Gorgan, I.R. Iran‎
2 Associate Professor, Faculty of Forest Science, Gorgan University of Agricultural Sciences and Natural ‎Resources, Gorgan, I.R. Iran‎
3 Professor, Faculty of Forest Science, Gorgan University of Agricultural Sciences and Natural Resources, ‎Gorgan, I. R. Iran‎
4 Associate Professor, Faculty of Natural Resources, Tarbiat Modares University, I. R. Iran‎
چکیده [English]

The impact of logging and tree harvesting on the ecological function and the future of Hyrcanian forests structure is a continuing debate topic. The information is currently available does not support firm conclusions about the impact of forest harvest intensity on forest structure and biomass. The present study aims to evaluate the effect of single-tree selection harvest intensity on biomass of hornbeam-Persian ironwood stand. For this purpose, information on all trees and dead trees were collected in 70 half-hectare plots. The 35 sample plots were in single-tree selection stands with three harvest intensities and the same sample plots were in control stand. Trees litter fall were measures from September to February and the storage of soil organic carbon was determined through organic carbon and bulk density. Then, tree biomass, litter biomass, dead tree biomass and total biomass were finally calculated. The results showed with increasing the rate of harvest intensity up to 13.5% the total biomass had rising trends, although harvest intensity had no significant effect on aboveground and belowground biomass and soil organic carbon. The aboveground biomass was higher in single-tree selection stand than control stand. The average of total biomass was 147 and 144 ton/ha in harvest and control hornbeam-Persian ironwood stands respectively and harvesting increased two percent of mean total biomass. The medium harvest intensity (3.6-9.5% of stand volume) was finally determined as appropriate selective logging intensity. The correspondence of litter biomass and dead tree biomass as bio indicator indicated that tree marking in the single-tree selection system was advisable.

کلیدواژه‌ها [English]

  • Biomass
  • Harvest
  • litter
  • Dead tree
  • Selection system
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