تأثیر شدت نور نسبی و موقعیت مکانی قطعه‌نمونه بر ویژگی‌های کمی زادآوری شش گونه درختی (مطالعه موردی: جنگل لوه- استان گلستان)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 استادیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران،‌ ایران

2 کارشناس ارشد جنگل‌داری، دانشکده علوم جنگل‌، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

3 دکتری جنگل‌داری، مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران،‌ ایران

4 کارشناس، پژوهشکده گیاهان و مواد اولیه دارویی، دانشگاه شهید بهشتی، تهران، ایران

چکیده

آگاهی از ویژگی‌های زادآوری در توده‌های جنگلی، از موارد مهم و ضروری در مدیریت درست منابع جنگلی است. هدف از اجرای پژوهش پیش‌رو، شناسایی گونه‌های مناسب برای کاشت در موقعیت‌های مختلف داخل روشنه (مرکز، حاشیه و زیر تاج‌پوشش) و تأثیر تغییرات شدت نور نسبی بر مشخصه‌های رویشی نهال‌های گونه‌های مختلف بود. ده روشنه در توده‌های طبیعی بلوط- ممرز در سری یک جنگل لوه (استان گلستان) انتخاب شد و ویژگی‌های مختلف زادآوری در موقعیت‌های مختلف روشنه اندازه‌گیری شدند. نتایج نشان داد که فراوانی گونه‌ها در موقعیت‌های مختلف روشنه و شدت‌های مختلف نور نسبی متفاوت بود. در بین نهال‌های گونه‌های مختلف فقط متوسط اندازه نوشاخه بهاره نهال‌های بارانک (Sorbus torminalis) در مرکز روشنه با اختلاف معنی‌داری بیشتر از موقعیت‌های دیگر بود. همچنین فقط رویش طولی سالانه بارانک در شدت نور نسبی بیشتر از 40 درصد و رویش قطری سالانه ممرز (Carpinus betulus) و آلوکک (Prunus avium) در شدت نور نسبی 30 تا 40 درصد با اختلاف معنی‌داری بیشتر از شدت‌های نور نسبی دیگر بود. پیشنهاد می‌شود که آمیختگی و نیازهای اکولوژیک گونه‌ها هنگام جنگل‌کاری در روشنه‌ها مورد توجه کارشناسان قرار گیرد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Effects of position within gap and relative light intensity on quantitative regeneration attributes of six tree species (Case study: Loveh forest- Golestan province)

نویسندگان [English]

  • Pejman Parhizkar 1
  • Yaser Shahini 2
  • Mohammad Hosein Sadeghzadeh Hallaj 3
  • Azade Yaghoubian 4
1 Research Expert, Medical Plant and Drugs Research Institute, Shahid Beheshti University, Tehran, Iran
2 M.Sc. Forestry, Faculty of Forest Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
3 Ph.D. Forestry, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
4 Assistant Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
چکیده [English]

Identifying regeneration characteristics is a decisive prerequisite in forest stands management. Therefore, the objective of this research was to 1) present the most appropriate tree species for reforestation within stand gaps and 2) study the effect of relative light intensity on regeneration characteristics. Quantitative characteristics were measured in 10 gaps at district one of Loveh forest in Golestan province. Results showed differing frequencies of species depending on gap positions and relative light intensities. Except checker (Sorbus torminalis) regenerations, no significant difference was observed between mean of spring shoot length within gap positions. Annual height growth of checker was maximum for 40% relative light intensity, while the annual diameter growth of hornbeam (Carpinus betulus) and wild cherry (Prunus avium) were maximum for relative light intensity ranging between 30 and 40%, respectively. No significant difference for relative light intensities was observed between other spices characteristics. Therefore, the study concludes that the highest attention should be paid to species mixtures and their ecological requirements for reforestation within the gaps.
 

کلیدواژه‌ها [English]

  • Gap
  • Growth
  • Loveh
  • regeneration
  • relative light intensity
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