بررسی حضور جوانه‌خوار بلوط (Tortrix viridana L.) در طبقات مختلف ارتفاعی جنگل‌های بلوط استان آذربایجان‌غربی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 کارشناسی ارشد جنگلداری، دانشکده منابع طبیعی، دانشگاه ارومیه، ارومیه، ایران

2 استادیار، گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه ارومیه، ارومیه، ایران

3 دانشیار، گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه ارومیه، ارومیه، ایران

چکیده

یکی از عوامل اصلی تخریب جنگل­های بلوط، پروانه جوانه­خوار بلوط (Tortrix viridana L.) است که با تغذیه از برگ و جوانه­های درختان بلوط خسارت زیادی را به این جنگل­ها وارد می­کند. هدف از انجام این پژوهش، بررسی تغییرات جمعیتی این آفت در طبقات ارتفاعی مختلف از سطح دریا بود. این پژوهش در سال 1397 در مناطق پردانان و میرآباد انجام شد. در هر منطقه در سه طبقه ارتفاعی، خط­نمونه­هایی با فواصل 100 متر پیاده و در هر طبقه ارتفاعی تعداد 30 درخت دارمازو (Quercus infectoria Olivier) که در راستای خط­نمونه مشخص قرار داشتند و از لحاظ شکل ظاهری (تاج و ارتفاع) مشابه بودند، مورد اندازه­گیری قرار گرفتند. از هر درخت چهار شاخه در چهار جهت اصلی انتخاب (هر جهت یک شاخه به طول 50 سانتی­متر) و لاروهای آفت شمارش و قطر شاخه­ها نیز اندازه­گیری شدند. نتایج نشان داد با توجه به تنوع اقلیمی دو منطقه، تعداد لاروهای جوانه­خوار بلوط در منطقه پردانان بیشتر از منطقه میرآباد بود. همچنین تعداد لاروهای این آفت برای هر دو منطقه در طبقه ارتفاعی 1300-1200 متر به ثبت رسید که نشان از مساعد بودن شرایط برای فعالیت لاروهای آفت دارد. طبقه ارتفاعی در پراکنش این آفت در جهات مختلف تاج درخت بی­تأثیر بود به­طوری­که بیشترین مقدار تراکم لاروهای جوانه­خوار بلوط در هر سه طبقه ارتفاعی در جهت شرقی تاج درخت و کمترین مقدار آن نیز در جهت غربی درختان به ثبت رسید.

کلیدواژه‌ها

عنوان مقاله [English]

Investigating the presence of oak leaf-roller (Tortrix viridana L.) at different altitude in oak forests of West-Azerbaijan province

نویسندگان [English]

  • Ahmad Asadi 1
  • Mohammad Reza Zargaran 2
  • Seyed Rostam Mousavi Mirkola 3
1 MSc. of Forestry, Department of Forestry, Faculty of Natural Resources, Urmia University, Urmia, I. R. Iran
2 Assistant Professor, Department of Forestry, Faculty of Natural Resources, Urmia University, Urmia, I. R. Iran
3 Associate Professor, Department of Forestry, Faculty of Natural Resources, Urmia University, Urmia, I. R. Iran
چکیده [English]

One of the main destruction factors of oak forests is the oak leaf roller Tortrix viridana L. which causes a lot of damage to these woods by feeding leaves and buds of oak trees. The purpose of study was to investigate the population changes of this pest in different altitudes. This research was conducted in 2018 in Perdanan and Mirabad. In each region, in three elevation classes, transects with 100 meters’ intervals, and in each elevation class, 30 individuals of Quercus infectoria Olivier, which were located along the specific transect and in terms of appearance approximately similar, measured. In each tree, four branches were selected in four main directions (each direction of a length of 50 cm) and the pest larvae counted and the diameter of the branches were measured. Data were analyzed by SPSS 18 software and comparison of means was performed using Duncan's multiple range test. Results showed that according to the climatic diversity of two regions, the number of T. viridana larvae in the Perdanan was higher than Mirabad. Also, the number of larvae was recorded for both areas in the 1200-1300 meters’ elevation, which shows that the favorable conditions for larvae activity. The elevation class had no effect on distribution of pest in directions of the tree crown. The highest number of larvae in all three elevation classes was recorded in the eastern direction of the tree and its lowest amount were recorded in the west direction.

کلیدواژه‌ها [English]

  • Zagros
  • Pest
  • Oak
  • Distribution
  • Population dynamism
  • Oak leaf-roller

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پژوهش و توسعه جنگل
دوره 9، شماره 2
شهریور 1402
صفحه 145-159

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