نشریه محیط زیست طبیعی

بررسی تغییرات کاربری کشاورزی زیراشکوب، تراکم تاج‌پوشش و تعداد پایه‌های درختی در جنگل‌های دنا

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم و مهندسی جنگل، دانشکدة کشاورزی و منابع طبیعی، دانشگاه یاسوج، یاسوج، ایران.

2 گروه مهندسی طبیعت، دانشکدة کشاورزی و منابع طبیعی دانشگاه یاسوج، یاسوج، ایران.

10.22059/jne.2025.398138.2822

چکیده

هدف از پژوهش حاضر بررسی روند تغییرات کاربری اراضی کشاورزی در زیراشکوب جنگل و بررسی تغییرات تراکم تاج‌پوشش و تعداد پایه‌های درختی در منطقة حفاظت‌شدة دنای غربی و منطقة آزاد مجاور آن در دورة­ زمانی 1967(1346 ه ش) تا 2023 (1402 ه ش) بود. از روش تفسیر چشمی و مقایسة همزمان تغییرات در محل قطعات نمونة دایره‌ای (1000 مترمربع) در یک شبکة آماربرداری 500×500 متری بر روی عکس‌های هوایی ارتو شده سال 1967 و تصاویرGoogle Earth  (2009 و 2023) به‌صورت دو به دو بر روی دو صفحة نمایشگر مجاور هم استفاده شد. در هر قطعه‌نمونه، تغییرات کاربری اراضی کشاورزی در زیر اشکوب جنگل در هفت طبقه و مشخصات پوشش جنگلی شامل درصد تراکم تاج‌پوشش و تعداد پایه‌های درختی و یا جست گروه ­ها تفسیر و ثبت شدند. برای تحلیل و مقایسة داده ­ها از ماتریس انتقال کاربری اراضی و آزمون‌های غیر پارامتریک فریدمن(Friedman)، من-ویتنی (Mann-Whitney U) و ویلکاکسون (Wilcoxon Signed-Rank) استفاده شد. نتایج نشان داد تغییر کاربری اراضی کشاورزی در منطقة حفاظت‌شده نسبت به منطقة آزاد ثبات بیشتری دارد، اما کاهش درصد تراکم تاج‌پوشش و تعداد پایه‌های درختی در این دورة­ زمانی نشان می­ دهد که تخریب پوشش جنگلی در اراضی کشاورزی زیراشکوب در منطقة حفاظت‌شده شدیدتر بوده است. در این دورة زمانی، میانگین تعداد پایه‌های درختی از 4/33 در سال 1967 به 3/65 در سال 2023 و میانة تراکم تاج‌پوشش در منطقة حفاظت‌شده از 20 درصد به 5 درصد کاهش داشته است. این یافته‌ها نشان‌دهندة تناقض با انتظارات حفاظتی است و لزوم مدیریت کارآمدتر برای کاهش تخریب جنگل‌ها را برجسته می‌کند. 

کلیدواژه‌ها

عنوان مقاله [English]

Study on changes in understory agricultural use, canopy density, and number of trees stands in Dena forests

نویسندگان [English]

  • Zahra Khorshidi Doghozloo 1
  • Alireza Salehi 1
  • Sohrab Alvaninejad 1
  • Mohsen Farzin 2

1 Department of Forest Science and Engineering, Faculty of Agriculture and Natural resources, University of Yasouj, Yasouj, Iran.

2 Department of Nature Engineering, Faculty of Agriculture and Natural Resources, University of Yasouj, Yasouj, Iran.

چکیده [English]

The aim of the present study was to investigate the trend of changes in agricultural land use in the forest understory and to investigate changes in canopy density and number of tree stands in the Western Danai Protected Area and its adjacent open area during the period 1967 (1346 AH) to 2023 (1402 AH). The method of visual interpretation and simultaneous comparison of changes in the location of circular sample plots (1000 m2) in a 500 x 500 m survey grid was used on orthophotos of 1967 and Google Earth images (2009 and 2023) in pairs on two adjacent display screens. In each sample plot, changes in agricultural land use in the forest understory in seven levels and forest cover characteristics including canopy density percentage and number of tree stands or group crossings were interpreted and recorded. The land use transition matrix and the nonparametric Friedman, Mann-Whitney U and Wilcoxon Signed-Rank tests were used to analyze and compare the data. The results showed that agricultural land use change in the protected area is more stable than in the open area, but the decrease in the percentage of canopy density and the number of tree stands during this period indicates that the forest cover destruction in understory agricultural lands in the protected area was more severe. During this period, the average number of tree stands decreased from 4.33 in 1967 to 3.65 in 2023 and the median canopy density in the protected area decreased from 20% to 5%. These findings indicate a contradiction with conservation expectations and highlight the need for more efficient management to reduce forest destruction.

کلیدواژه‌ها [English]

  • Deforestation
  • Dena Protected Area
  • Land cover-use change
  • Land use transition matrix
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نشریه محیط زیست طبیعی
دوره 78، شماره 3
آبان 1404
صفحه 509-521