برآورد میزان کربن انتشار یافته از جنگلکاری‌های کاج تدا (Pinus taeda L.) در اثر آتش سوزی با استفاده از معادلات آلومتریک

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد جنگلشناسی و اکولوژی جنگل دانشگاه گیلان

2 دانشجوی دکتری، جنگلشناسی و اکولوژی جنگل، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا، گیلان، ایران

3 دانش آموخته کارشناسی ارشد، جنگلشناسی و اکولوژی جنگل، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا، گیلان، ایران

4 دانش آموخته کارشناسی ارشد، جنگلشناسی و اکولوژی جنگل، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا، گیلان، ایران

چکیده

DOI: 10.22092/IJFRPR.2018.117135
DOR: 98.1000/1735-0859.1397.16.88.31.1.1576.1603
 
آتش ­سوزی از عوامل اصلی انتشار کربن از توده ­های جنگلی به­ شمار می­رود. از این رو مطالعه حاضر به ­منظور بررسی میزان انتشار کربن در اثر آتش ­سوزی صورت گرفته در جنگل ­کاری ­های کاج تدا (Pinus taeda L.) در منطقه تَخسَم از توابع لاکان شهر در استان گیلان انجام گرفت. بدین منظور، منطقه آتش ­سوزی شده به وسعت 5 هکتار و یک قطعه هم سطح با منطقه آتش ­سوزی شده نیز به عنوان شاهد در قسمت مصون مانده در کنار لکه آتش­ سوزی، انتخاب و در هر منطقه 5 قطعه نمونه 4 آری (400 متر مربعی) به صورت سیستماتیک تصادفی اجرا و قطر برابر سینه و ارتفاع کل درختان در آن برداشت شد. سپس با بررسی مطالعات انجام شده، در نهایت 5 مدل جهت محاسبه زی ­توده درختان در دو توده انتخاب شد. با توجه به نتایج این مطالعه، میانگین زی­توده درختان در توده شاهد بین 98/93086 (مدلP) تا 9/105362 کیلوگرم در هکتار (مدلM) برآورد شد و میانگین زی­توده درختان در توده آتش­سوزی شده بین73/67829 (مدلP) تا 04/83509  کیلوگرم در هکتار (مدلM) برآورد شد. همچنین نتایج این مطالعه نشان داد که مقدار اندوخته کربن در توده شاهد و توده آتش­سوزی شده به ترتیب 853/48 و 357/38 تن در هکتار می­باشد که آزمون t این اختلاف را معنی­دار نشان داد. میزان انتشار کربن در اثر آتش سوزی495/10 تن در هکتار و مجموع انتشار کربن در سطح لکه آتش­سوزی نیز 478/52 تن برآورد گردید. در میان مدل­های انتخاب شده مدل P (BD = β0 +β1(DBHβ2)) کمترین انحراف معیار را در محاسبات ارائه داد.
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Estimation of carbon emissions from loblolly pine (Pinus taeda L.) forest plantations using Allometric equations

نویسندگان [English]

  • K. Taheri Abkenar 1
  • A. Heidari Safari Kouchi 2
  • S. Dehghanzad 3
  • S. Mostahsanpour 4
  • F. Moradianfard 4
چکیده [English]

Fire is one of the main causes of carbon emission from forest stands. Therefore, the present study was conducted to investigate the amount of carbon emission caused by fire in the loblolly pine plantations in the Takhsam region that located in area of Lakan city of Guilan province. For this purpose, a burned region with 5 hectares’ area and a control region next to burned stand were selected and 5 circle sample plots with 4r­ (400 square meters) areas were accomplished in two stands by random-systematic method and trees diameter at breast height and total height in sample plots were taken. Then, by investigating the conducted studies Finally, 5 models selected to calculate the trees biomass in two stands. According to the results of this study, the average of trees biomass in the control stand was estimated between 93086.98 (P model) to 10536.9 kg/ha (model M) and the average of trees biomass in the burnt stand was estimated from 67829.73 (P model) to 83509.04 kg /ha (model M). The results of this study also showed that the carbon stock content in the control and fired stands was 48.853 and 38.357 tons per hectare respectively which showed significant difference in t-test. The amount of carbon emissions from the fire was 10495.69 tons per hectare and the total carbon emission at the surface of the fire spot was about 52.478 tons. Among the selected models, P model (BD = β0 +β1(DBH­β2)) provided the least standard deviation in the calculations.
 
 

کلیدواژه‌ها [English]

  • Carbon dioxide
  • global warming
  • Greenhouse gases
  • Loblolly pine
  • biomass
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