ارزیابی شدت بحران زوال در جنگل‌های استان کهگیلویه و بویراحمد (منطقه مورد مطالعه: تنگ سولک)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 دانش‌آموخته دکترای جنگل‌داری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه لرستان، خرم‌آباد، ایران

2 استادیار، گروه جنگل‌داری، دانشکده منابع طبیعی، دانشگاه لرستان، خرم‌آباد، ایران

3 دانشیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

چکیده

در این پژوهش به­منظور ارزیابی شدت بحران زوال در منطقه تنگ سولک استان کهگیلویه و بویراحمد، برخی پارامترهای ساختاری منطقه بررسی شدند تا حساسیت آنها در شدت ابتلا به بحران زوال مشخص شود. با توجه به تنک­بودن جنگل­های منطقه و هدف بررسی درختان خشکیده، نمونه­برداری در 100 قطعه‌نمونه یک هکتاری انجام شد. برای ارزیابی شدت بحران، از روشFierke  استفاده شد. در این روش تاج‌پوشش به شش طبقه خشکیدگی تقسیم می­شود که شاخص خشکیدگی طبقه­های تاج­پوشش (CCC) را مشخص می­کند. هم‌زمان تعداد سوراخ­های واضح روی تنه، شاخص سوراخ­های تنه (BEC) را تعریف می­کند. در نهایت، شاخص ارزیابی شدت خشکیدگی برای بحران زوال (REI) از مجموعBEC  و CCC محاسبه می­شود. ارزش REI سبب تقسیم­بندی درختان در سه طبقهⅠ، Ⅱ، Ⅲ می­شود که هریک از طبقه­ها، اندازه­ای از شدت بحران را مشخص می­کنند. نتایج این پژوهش نشان داد که تنها 11 درصد درختان منطقه به پدیده خشکیدگی دچار شده­اند. همچنین 88 درصد درختان پهن­برگ منطقه در طبقه شدت ضعیف بحران زوال هستند و فقط 12 درصد درختان خشکیده در طبقه متوسط یعنی مرحله پیشروی زوال قرار دارند.
 

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of the crisis severity in forests of Kohgiluye and Boyerahmad province (Case study: Tang-e Solak)

نویسندگان [English]

  • Mahdi Zandebasiri 1
  • Javad Soosani 2
  • Mahdi Pourhashemi 3
1 Ph.D. Graduated in Forestry and Forest Economic, Faculty of Natural Resources, Lorestan University, Khoramabad, Iran
2 Assistant Prof., Department of Forestry, Faculty of Natural Resources, Lorestan University, Khoramabad, Iran.
3 Associate Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
چکیده [English]

In this study, some forest biometric parameters were studied to evaluate the decline severity in Tang-e Solak forest area in Kohgiluyeh and Boyerahmad province. Hundred plots of one hectare each were used. The Fierke method was used to evaluate the decline severity. In this method, crown condition classes (CCC) and Basal Emergence hole Classes (BEC) are divided into 6 groups. Finally Rapid Estimation Index (REI) was calculated by aggregating CCC and BEC. REI was then classified into tree classes for determining the dieback severity. The result of this study showed that 88% of broad-leaved trees are in weak severity, while only 12% include medium severity of decline.
 

کلیدواژه‌ها [English]

  • Crisis management
  • Forest structure
  • Quercus brantii
  • rapid estimation index
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