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تغییرات ساختار توده جنگلی در قطعه بررسی دایمی طرح جنگلداری نکاظالمرود | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 8، دوره 24، شماره 2 - شماره پیاپی 64، تیر 1395، صفحه 272-260 اصل مقاله (181.24 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2016.106989 | ||
| نویسندگان | ||
| محمد امینی* 1؛ روجا امینی2؛ خسرو ثاقبطالبی3؛ سیفاله خورنکه4 | ||
| 1استادیار پژوهش، بخش تحقیقات منابع طبیعی، مرکز تحقیقات کشاورزی و منابع طبیعی مازندران | ||
| 2دانشجوی دکتری جنگلداری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان | ||
| 3دانشیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور | ||
| 4کارشناس ارشد پژوهش، بخش تحقیقات منابع طبیعی، مرکز تحقیقات کشاورزی و منابع طبیعی مازندران | ||
| چکیده | ||
| این پژوهش با هدف بررسی تغییرات ساختار جنگل در قطعه بررسی دایمی شش هکتاری در طرح جنگلداری نکاظالمرود با استفاده از دو آماربرداری صددرصد در سالهای 1385 و 1391 انجام شد. نتایج آماربرداری سال 1391 از 2375 اصله درخت، حاکی از یک توده سهآشکوبه ناهمسال در تیپ راش- ممرز بود. متوسط تعداد درخت 389 اصله در هکتار، متوسط رویه زمینی 43 متر مربع، متوسط حجم درختان سرپا و افتاده 538 متر مکعب در هکتار و ضریب دولیوکور 38/1، سهم خشکهدارها از تعداد درختان 3/1 درصد و از حجم جنگل 5/7 درصد بود. مقایسه نتایج دو آماربرداری نشان داد که راش در همه طبقات قطری دارای سطح و سهم بیشتری بود و ممرز در همه طبقات قطری سهم بیشتری را از دست داده بود. در طبقات قطری کمتر از 30 سانتیمتر اختلاف سهم راش و ممرز مشهود بود. انجیلی و خرمندی در طبقات قطری 30 تا 50 سانتیمتر نسبت به ممرز وضعیت تثبیتشدهای را نشان دادند. حجم درختانی که دارای یکی از چهار نوع صدمه (سرشکسته، توخالی، خشک سرپا و افتاده) بودند، 97 متر مکعب و سهم خشکهدارها 30/6 متر مکعب در هکتار بود. در دوره ششساله، درختان قطور توخالی به گروه درختان افتاده تغییر وضعیت داده بودند. خشک شدن درختان در طبقات قطری کمتر از 50 سانتیمتر باعث ایجاد فضاهای رویش با تعداد زیاد و پراکنده و افزایش درختان جوان در طبقات قطری 10 و 15 سانتیمتر شده بود. سالانه 9/6 متر مکعب در هکتار معادل 1/6 درصد موجودی سرپا تجزیه شده بود که تقریباً 28 درصد خشکهدارها و 8/9 درصد حجم درختان صدمه دیده بود. بهطور کلی این جنگل در سیر توالی، در گذر از مرحله متمایل به پیری به مرحله متمایل به جوانی قرار داشت. | ||
| کلیدواژهها | ||
| ترکیب توده؛ خشکهدار؛ راش؛ ساختار؛ قطعه بررسی دایمی؛ ممرز | ||
| عنوان مقاله [English] | ||
| Changes in forest stand structure in a permanent plot established in Neka-Zalemroud forest plan | ||
| نویسندگان [English] | ||
| Mohammad Amini1؛ Rouja Amini2؛ Khosro Sagheb Talebi3؛ Seifollah Khorankeh4 | ||
| 1Assistant Prof., Research Division of Natural Resourses, Mazandaran Agricultural and Natural Resources Research Center, AREEO | ||
| 2Ph.D. Student Forestry, Department of Forestry, Faculty of Natuarl Resources, Gorgan Agricultural and Natural Resources University | ||
| 3Associate Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO) | ||
| 4Research Expert, Research Division of Natural Resourses, Mazandaran Agricultural and Natural Resources Research Center, AREEO | ||
| چکیده [English] | ||
| A permanent sample plot with an area of 6 ha is located on mid elevation of the Neka-Zalemrood forest, south of Sari in northern Iran. After fencing the plot, a metal tag indicating tree number was installed on each tree. A full calipering was conducted, which was followed by measuring the diameter at breast height (DBH) and height of selected trees. Forest structure, proportion of dead wood, and proportion of tree species were studied for a period between 2006 and 2012. Results of the inventory of the total 2375 trees in 2012 showed three storeys and an uneven-aged structure in Fagus orientalis-Carpinus betulus forest type. Further results included mean tree number of 389 ha-1, mean basal area of 43 m2ha-1, mean stand volume of 538 m3ha-1, and De' Liocourt factor of 1.38. Dead trees accounted for 3.1% of the total tree number and 5.7% of the stand volume. Comparison between the two inventories (2006 and 2012) showed that beech trees gained a higher proportion among the tree species in almost all diameter classes, while hornbeam lost more of its presence in the diameter classes. Amongst the DBH classes < 30cm, the proportional difference between beech and hornbeam was more obvious. Compared to hornbeam, Parrotia persica and Diospyrus lotus showed more presence in the DBH classes of 30 to 50cm. Volume of damaged trees (broken, hollow, snag and log) was accounted for 97 m3ha-1, while for dead wood was 30.6 m3ha-1. Within the six-year study period, hollow large trees have been fallen down. Mortality of trees in DBH classes < 50cm provided a lot of scattered small gaps within the stand and supported the establishment of younger individuals and cohorts. In addition, almost 9.6 m3ha-1, comprising 1.6% of the total volume, 28% of dead trees and 8.9% of damaged trees was decomposed. All in all the studies forest was concluded to be tending from the senility to juvenility in forest succession. | ||
| کلیدواژهها [English] | ||
| Stand composition, dead wood, beech, Structure, permanent sample plot, hornbeam | ||
| مراجع | ||
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