مقایسه برخی مشخصه‌های کمی قطعه مدیریت‌شده به روش دانگ واحد با قطعه شاهد (مطالعه موردی: جنگل‌های سری سه سنگده)

نوع مقاله : علمی- پژوهشی

نویسندگان

1 کارشناس ارشد جنگل‌داری، شرکت بهره‌برداری و صنایع چوب فریم

2 دانشیار، گروه جنگل‌داری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری

چکیده

طرح جنگل‌داری سنگده در سال 1348 در قالب شیوه پناهی به اجرا درآمد و برش نهایی بین سال‌های 1370 تا 1374 انجام شد. این پژوهش به‌منظور مقایسه برخی مشخصه‌های کمی قطعه شاهد و یکی از قطعات دانگ واحد با نمونه‌برداری به روش منظم- تصادفی و ابعاد شبکه 150×100 متر در جنگل‌های سری سه طرح جنگل‌داری مذکور انجام شد. نتایج نشان داد که میانگین موجودی در هکتار قطعه شاهد و دانگ به‌ترتیب 464/27 و 240/95 سیلو، میانگین تعداد در هکتار، 232 و 599 اصله، متوسط سطح مقطع در هکتار، 31/69 و 22/74 متر مربع، میانگین قطر درختان، 39/9 و 21 سانتی‌متر، متوسط ارتفاع، 28/3 و 21/27 متر و ساختار جنگل در قطعه شاهد دو و سه‌اشکوبه بود، اما در دانگ یک و دواشکوبه بود. متوسط تعداد در هکتار پایه‌های با قطر کمتر از 12/5 سانتی‌متر (زادآوری) در قطعه شاهد 1487 و در دانگ 715 اصله بود که به‌جز در طبقه قطری 7/5 تا 12/5 سانتی‌متر، در طبقه‌های دیگر فراوانی پایه‌ها در دانگ نسبت به قطعه شاهد کمتر بود. در مورد متوسط موجودی، تراکم، سطح مقطع، قطر و ارتفاع درختان، بین قطعه شاهد و دانگ واحد اختلاف معنی‌داری وجود داشت، بنابراین با این‌که در برخی از مشخصه‌ها نتایج مورد انتظار به‌دست آمد و شیوه مذکور به‌نسبت موفق عمل کرده بود، اما با توجه به وجود پایه‌های مادری و زادآوری پیش‌بجا و آمیختگی، نتایج مورد انتظار به‌دلیل نحوه و دقت اجرای آن با شرایط مطلوب تا حدودی فاصله داشت.

کلیدواژه‌ها

عنوان مقاله [English]

Quantitative characteristics of a forest compartment managed under unique-block with a control compartment (Case study: District 3, Sangdeh forests)

نویسندگان [English]

  • Seyyed Mohammad Mehdi Rezaei Sangdehi 1
  • Asghar Fallah 2
  • Mohammad Reza Pourmajidian 2
  • Seyyed Mohammad Hodjati 2
1 M.Sc. Forestry, Farim Wood Industries & Logging Company, Sangdeh
2 Associate Prof., Department of Forestry, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University
چکیده [English]

The forest management plan of Sangdeh (Mazandaran province) was first implemented in in1969 under a Shelterwood system, which led to final cuttings conducted between 1991 and 1995. This study was planned to compare some of the major quantitative characteristics of compartments managed under a unique block method to a selected control compartment. The forest inventory was carried out in a systematic random sampling with a 100×150 m grid size.The results showed the average growing stock of 464.27 and 240.95 silve per hectare in control and unique block, respectively. In addition, the average number of trees per ha were 232 and 599 trees, the average basal areas per ha were 22.74 and 31.69 m2, the average tree diameters were 39.90 and 21.00 cm and the average heights were 28,30 and 21,27 m, respectively. Furthermore, the vertical forest structure consisted of three and two stories in control stand, while it consisted of one and maximum two layers in the unique block. The average rates for total regeneration accounted for 1487 and 715 tree per ha in control and unique block, respectively. Furthermore, regeneration frequency in unique block showed a reduction compared to the control for all of class except in 7.5-12.5 cm class. Significant differences were observed for the average stock density, basal area, tree height and diameter between the control and unique block stands. All in all, although the unique block was evaluated relatively successful in the light of the majority of measured characteristics, the achieved results are assessed to be still sup-optimal when considering the mother trees and the expected advanced regeneration mixture.

کلیدواژه‌ها [English]

  • Forest management plan
  • regeneration
  • shelterwood
  • systematic random sampling

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