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مشخصات کمی و کیفی خشکهدارها در مراحل مختلف تحولی تودههای آمیخته راش (پژوهش موردی:جنگل خیرود نوشهر) | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 8، دوره 23، شماره 4، دی 1394، صفحه 647-659 اصل مقاله (187.64 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2015.106586 | ||
| نویسندگان | ||
| مرتضی مریدی* 1؛ وحید اعتماد2؛ مهدی کاکاوند3؛ خسرو ثاقبطالبی4؛ الهه علیبابایی3 | ||
| 1دانشجوی دکتری جنگلداری، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات | ||
| 2استادیار، گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران | ||
| 3کارشناس ارشد جنگلداری، گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران | ||
| 4دانشیار پژوهش،موسسه تحقیقات جنگلها و مراتع کشور | ||
| چکیده | ||
| خشکه دارها نقش مهمی در پویایی اکوسیستمهای جنگلی بر عهده دارند. آگاهی از ویژگیهای کمی و کیفی خشکهدارها در مراحل مختلف تحولی میتواند در تدوین راهکارهای مدیریتی همگام با طبیعت تودههای طبیعی و مدیریت نشده راهگشا باشد. پژوهش پیشرو با هدف بررسی ویژگیهای کمی و کیفی خشکهدارها بهعنوان شاخصهایی از مراحل تحولی توده در پارسلهای 317 و 318 بخش گرازبن از جنگلهای کمتر دستخورده خیرود انجام شد. سه قطعهنمونه یک هکتاری که هر کدام در یکی از مراحل تحولی اولیه، بلوغ و پوسیدگی قرار گرفته بودند، انتخاب شدند و آماربرداری صددرصد از مشخصه های خشکه دارها شامل قطر و ارتفاع یا طول با قطر بیشتر از 7/5 سانتیمتر و مشخصات کیفی شامل شکل و درجه پوسیدگی انجام شد. نتایج نشان داد که خشکهدارها دارای تفاوت هایی از نظر تعداد در هکتار، حجم، نوع و اندازه در سه مرحله بودند. خشکهدارهای افتاده در مرحله اولیه و مرحله پوسیدگی فراوانی بیشتری نسبت به خشکهدارهای سرپا بهخود اختصاص دادند، در حالیکه در مرحله بلوغ عکس آن بود. بیشترین و کمترین حجم خشکهدار بهترتیب در مرحله اولیه و بلوغ مشاهده شد. در هر سه مرحله بیشترین حجم خشکهدار در راش مشاهده شد. مرحله بلوغ بیشترین فراوانی خشکهدار را بهخود اختصاص داد، اما تمام خشکهدارها در این مرحله در طبقه قطری کمتر از 35 سانتیمتر قرار گرفتند. بیشتر خشکهدارها در مرحله اولیه در درجات پوسیدگی پیشرفته قرار داشتند. | ||
| کلیدواژهها | ||
| توده؛ خشکهدار؛ خصوصیات کمی؛ راش؛ مراحل تحولی | ||
| عنوان مقاله [English] | ||
| Qualitative and quantitative characteristics of deadwood in the different development stages in mixed oriental beech (Fagus orientalis Lipsky) stands (Case study: Gorazbon district, Kheiroud forest of Nowshahr) | ||
| نویسندگان [English] | ||
| Morteza Moridi1؛ Vahid Etemad2؛ Mehdi Kakavand3؛ Khosro Sagheb Talebi4؛ Elahe Alibabaei Omran3 | ||
| 1Ph.D. Student of Forestry, Science and Research Branch, Islamic Azad University | ||
| 2Assistant Prof., Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran | ||
| 3M.Sc. Forestry, Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran | ||
| 4Associate Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO) | ||
| چکیده [English] | ||
| Deadwood is commonly known as an essential structural and functional element in forest communities. Thus it is important to understand its role and natural dynamics to improve the forest management strategies in both managed and unmanaged forests. This study analyzed both qualitative and quantitative characteristics of deadwoods asindicatorsof stand developmental stages in the unmanaged forests of Kheiroud in Mazandaran province, northern Iran. Three sample plots were established in the initial, optimal and decay stages, in which attributes such as diameter at breast height, height of all standing and dead trees as well as the decomposition stage of dead trees were recorded. Results showed differencesin the amount of deadwood per ha as well as in volume, type andsizeofthe coarse woody debris (CWD) in all the three stages. The frequency of snags was higher than logs in initial and decay stages, whereasthe proportion of logs was greater than snags in the optimal stage. Moreover, maximum and minimum volume ofthe CWD was observed in the initial and optimal stages. Amongst the species, beech returned the highest number and volume of deadwood in all three stages. In addition, the entire deadwood showed diameter | ||
| کلیدواژهها [English] | ||
| stand, Deadwood, quantitative characteristics, beech, developmental stages | ||
| مراجع | ||
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