مقایسه مشخصه‌های کمی و کیفی جنگل پس از اجرای یک دوره طرح جنگل‌داری (مطالعه موردی: حوزه آبخیز 65، بخش جوجاده، شرکت چوب فریم)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 ، کارشناس ارشد جنگل‌داری، شرکت بهره‌برداری و صنایع چوب فریم، سنگده، ساری، ایران.

2 کارشناس ارشد آموزشی، گروه جنگل‌داری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

3 دانشجوی دکتری جنگل‌داری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

چکیده

به‌منظور بررسی تغییرات کمی و کیفی پس از یک دوره طرح جنگل‌داری، 1270 هکتار از جنگل‌های بخش جوجاده انتخاب شد و 265 قطعه‌نمونه ثابت طی آماربرداری به‌روش تصادفی- منظم با شبکه 200×150 متر در سال‌های 1383 و 1393 مقایسه شدند. در قطعات نمونه 10 آری، اطلاعاتی شامل گونه، قطر، درجه کیفی و ارتفاع درختان شاهد و در ریزقطعه‌نمونه‌های یک‌آری، وضعیت زادآوری برداشت شد. طی دوره 10ساله مورد مطالعه با دخالت به‌شیوه تک‌گزینی، در حدود 14000 سیلو در قالب انواع برش‌های تک‌گزینی نشانه‌گذاری شد. نتایج نشان داد که به‌ترتیب در سال‌های 1383 و 1393 میانگین تعداد در هکتار 173 و 175 اصله، حجم در هکتار 36/318 و 24/360 سیلو، سطح مقطع در هکتار 87/25 و 31/28 متر مربع، قطر سطح مقطع متوسط 93/43 و 39/43 سانتی‌متر و میانگین ارتفاع لوری 31/25 و 40/26 متر بودند که غیر از مشخصه تعداد در هکتار، بین بقیه مشخصه‌ها اختلاف معنی‌داری در دو مقطع زمانی وجود داشت. درمجموع، فراوانی زادآوری تفاوت معنی‌داری را در دو مقطع زمانی نشان داد و کاهش زادآوری‌ها برحسب گونه متأثر از کاهش معنی‌دار نونهال و نهال‌ها در سال 1393 بود. همچنین، درصد درختان با درجه کیفی یک و سه افزایش، با درجه کیفی دو کاهش و با درجه کیفی چهار تغییری نداشت. نتایج نشان داد که در دوره 10ساله، میانگین مشخصه‌های کمی و تاحدودی مشخصه‌های کیفی جنگل از حالت مطلوب فاصله نداشت که نشان‌دهنده اجرای صحیح شیوه جنگل‌شناسی همگام با طبیعت است.
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Comparing the forest quantitative and qualitative characteristics following a period of forestry plan implementation (Case study: Watershed 65, Jojadeh zone of Farim Company, Mazandaran province)

نویسندگان [English]

  • Seyed Mohammad Mahdi Rezaei Sangdehi 1
  • Seyyed Mostafa Moslemi 2
  • Mahya Tafazoli 3
1 M.Sc. Forestry, Farim Wood Industries & Logging Company, Sangdeh, Iran
2 Education Expert, Department of Forestry, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
3 Ph.D. Student Forestry, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
چکیده [English]

To assess the changes in qualitative and quantitative attributes at the end of a period of forestry plan implementation, a portion of the Jojadeh zone with an area of 1270 ha was selected. Data were collected from 265 permanent plots in a systematic random design (1000 mplots and150 × 200 m grid size) in 2004 and 2014 to facilitate a comparison. In each plot diameter, species, quality grade, height of control tress and quality of regeneration (in 100 m2 microplots) weree measured. During the ten-year period, approximately 14000 silve of growing stock was marked within a single tree selection cutting system. The results showed following figures for 2004: the average number of trees per ha=173, volume per ha=318.36 silve, basal area per ha= 25.87 m2, diameter of basal area= 43.93 cm and Lorey’s mean height= 25.31 m. The values in 2014 were 175, 360.24 silve, 28.31 m2, 43.39 cm and 26.40 m, respectively. Apart from number of trees per ha, significant differences were observed between the two measurement times for the other attributes. Furthermore, the species specific regeneration frequency was affected by a significant reduction in seedling and saplings in 2014. However, tree percentages increased in 1st and 3rd quality grade classes, whereas it decreased 2nd class andd remained unchanged in 4th class. All in all, the results showed that the average values of quantitative and partlyy qualitative characteristics were not far from favorable conditions during the period of forestry plan, which indicated the conducted silvicultural practices served the defined goals of the close to nature forestry method.
 

کلیدواژه‌ها [English]

  • Average diameter of basal area
  • Lorey’s height
  • qualitative and quantitative characteristics

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