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ارزیابی روند تغییرات شاخصهای رقابت بهمنظور برآورد اثر نشانهگذاری در جنگل راش شرقی (Fagus orientalis Lipsky) منطقه لاویج نور | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 9، دوره 26، شماره 1 - شماره پیاپی 71، فروردین 1397، صفحه 81-92 اصل مقاله (774.81 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2018.116143 | ||
| نویسندگان | ||
| اسداله متاجی1؛ رضا شیدایی* 2؛ هادی کیادلیری3 | ||
| 1استاد، گروه جنگلداری، دانشکده کشاورزی و منابع طبیعی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران | ||
| 2دانشجوی دکتری جنگلداری، دانشکده کشاورزی و منابع طبیعی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران | ||
| 3دانشیار، گروه جنگلداری، دانشکده کشاورزی و منابع طبیعی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران | ||
| چکیده | ||
| تغییرات بین پایهای رویش متأثر از ترکیب، ساختار و رقابت بین پایهها است. بر این اساس، آگاهی از الگوی ساختار و درک مناسب از چگونگی پاسخ پایهها به تعاملات رقابتی از اهمیت قابل توجهی برخوردار است. پژوهش پیشرو با هدف ارزیابی روند تغییرات شاخصهای رقابت در اثر اقدامات مدیریتی در جنگل راش (Fagus orientalis Lipsky) خالص (پارسل مدیریت شده به مساحت 36 هکتار) در منطقه لاویج شهرستان نور، استان مازندران، انجام شد. کلیه پایههای نشانهگذاری شده (58 پایه) پیش از قطع مکانیابی شده و بهعنوان پایه هدف درنظر گرفته شدند. به مرکزیت پایه هدف و به شعاع 3/5 برابر شعاع تاج پایه هدف، قطعهنمونه دایرهای پیاده شد و فاصله، آزیموت، قطر برابر سینه، ارتفاع، ارتفاع شروع تاج و شعاع تاج در جهتهای مختلف کلیه پایهها با قطر بیشتر از 7/5 سانتیمتر اندازهگیری شد. بهمنظور بررسی رقابت، از شاخصهای وابسته به فاصله نظیر جرارد، بلا، هگی و براث استفاده شد. نتایج نشان داد که تودههای مورد بررسی میانسال و بیشتر دخالتها در طبقه میانقطر انجام شده بود. همچنین، پس از نشانهگذاری، در مقدار شاخصهای رقابت تغییر معنیداری ایجاد نشده بود. بر این اساس، اقدامات مدیریتی (نشانهگذاری) در سطح توده هدفمند نبوده و به روند تغییرات رقابت پایهای توجه نشده است. بنابراین، با توجه به اهمیت عامل رقابت و ارتباط آن با پارامترهای اندازهای توده، باید در اقدامات مدیریتی به روند تغییرات آن توجه شود. | ||
| کلیدواژهها | ||
| جنگلهای هیرکانی؛ ساختار توده؛ شاخصهای فاصلهای | ||
| عنوان مقاله [English] | ||
| Evaluation of competition indices to assess the effect of management interventions on oriental beech (Fagus orientalis Lipsky) forest of Lavij- Noor region, Mazandaran province | ||
| نویسندگان [English] | ||
| Asadollah Mataji1؛ Reza Sheydaei2؛ Hadi Kiadaliri3 | ||
| 1Prof., Department of Forestry, Faculty of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
| 2Ph.D. Student Forestry, Faculty of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
| 3Associate Prof., Department of Forestry, Faculty of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
| چکیده [English] | ||
| Tree to tree variation in growth results from compositional complexity, stand structure and competition. Therefore, it is essential to know how trees respond to competitive interactions. This study aims to evaluate of competition indices in order to assessment of management interventions effects in pure beech (Fagus orientalis Lipsky) stands (with 36 hectares) in Lavij- Noor region of Mazandaran province. For this purpose, the positions of all 58 marked trees were recorded as cored trees. Competition plots centered on the cored tree with radius of 3.5 × the cored tree crowns were established. The following attributes were measured for each tree (≥ 7.5 cm diameter at breast height (DBH)) within the plots: X and Y coordinates (m), total height, DBH, crown diameter at the base of the living crown in different directions and crown length. In order to quantify the competition level by each of the cored trees, 4 different distance-independent indices including Gerrard, Bella, Hegyi and Braathe were used. The results showed that the studied stands were middle-aged, the major interventions were in the middle DBH classes, and there was no significant change in the amount of competition indices following the interventions. Accordingly, the management interventions (marking) were not targeted and the process of individual tree competition changes was not measured. Therefore, the process of competition changes is necessary to be considered in stand management due to the high importance of the competition factor and its relation to the stand parameters. | ||
| کلیدواژهها [English] | ||
| Distance-independent indices, Hyrcanian forests, stand structure | ||
| مراجع | ||
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