اثر اندازه و موقعیت‌های داخلی روشنه تاج بر رشد و زنده‌مانی نهال‌های بلندمازو (Quercus castaneifolia)، شیردار (Acer cappadocicum) و توسکای ییلاقی (Alnus subcordata)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 کارشناس ارشد جنگلشناسی و اکولوژی جنگل، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

2 استادیار،‌ دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

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

4 دانشجوی دکتری جنگل‌داری، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

چکیده

در این پژوهش با هدف بررسی تأثیر اندازه و موقعیت روشنه بر زنده‌مانی نهال‌ها، شش روشنه با اندازه­‌های متوسط (200 تا500 متر مربع) و بزرگ (بزرگتر از 500 متر مربع) در جنگل شصت‌کلاته گرگان انتخاب شدند. پس از مشخص کردن پنج قطعه‌نمونه 36 مترمربعی (6×6 متر) در جهت­‌های مرکز، شمال، جنوب، شرق و غرب روشنه­‌ها، 12 نهال یک‌ساله از هریک از گونه­‌های بلندمازو (Quercus castaneifolia C. A. Mey.)، شیردار (Acer cappadocicum Gled.) و توسکای ییلاقی (Alnus subcordata C. A. Mey.) با فاصله‌های 1×1 متر در آن‌ها کاشته شدند. رشد ارتفاعی و سطح فتوسنتزی نهال‌های کاشته‌شده در طول دوره رویش و زنده‌مانی نهال‌ها در انتهای دوره، مورد بررسی قرار گرفت. داده­‌ها با استفاده از روش تجزیه طرح کرت‌های دوبار خردشده و آزمون SNK تجزیه ‌و تحلیل شدند. نتایج نشان داد که با افزایش اندازه روشنه، درصد زنده­‌مانی نهال­‌های هر سه گونه به‌طور معنی‌­داری کاهش یافت. هم در روشنه بزرگ و هم در روشنه­‌های متوسط، نهال­‌های بلندمازو از بیشترین زنده‌­مانی برخوردار بودند و در روشنه‌های بزرگ نهال­‌های شیردار در مقایسه با سایر گونه­‌های کاشته‌شده از درصد زنده­‌مانی کمتری برخوردار بودند. بیشترین رشد ارتفاعی نهال­‌ها مربوط به موقعیت­‌های مرکزی بود و به‌­ترتیب در موقعیت­‌های شمال، غرب، جنوب و شرق درون روشنه­‌ها، رشد ارتفاعی کاهش یافت. با افزایش اندازه روشنه، توسکای ییلاقی و بلندمازو از رشد ارتفاعی و سطح فتوستزی بیشتری برخوردار شدند، اما شیردار در روشنه‌های متوسط عملکرد بهتری داشت. بنابراین، پیشنهاد می‌‌شود برای جنگل­کاری­ درون روشنه­‌های بزرگ و یا موقعیت مرکزی روشنه­‌های متوسط از توسکای ییلاقی و بلندمازو و برای جنگل­کاری در روشنه‌های متوسط و یا حاشیه­ روشنه­‌های بزرگ از شیردار استفاده شود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of gap size and position within gaps on growth characters and survival of chestnut-leaved oak (Quercus castaneifolia C. A. Mey.), Cappadocian maple (Acer cappadocicum Gled.) and Caucasian alder (Alnus subcordata C. A. Mey.)

نویسندگان [English]

  • Ahmad Abdolahi 1
  • Ali Raza Ali Arab 2
  • Pejman Parhizkar 3
  • Ali Akbar Mohammad Ali Pourmalekshah 4
1 M.Sc. Silviculture and Forest Ecology, Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2 Assistant Prof., Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
3 Assistant Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
4 Ph.D. Student Forestry, Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
چکیده [English]

In this study,six canopy gaps with medium (200-500 m2) and large (> 500m2) sizes were selected in Shastkolate forest. In each gap, micro sample plots (6×6 m) were established at the center and north, east, south and west directions of each gap. Within each micro plot, 12 seedlings of chestnut-leaved oak (Quercus castaneifolia C. A. Mey.), Cappadocian maple (Acer cappadocicum Gled.) and Caucasian alder (Alnus subcordata C. A. Mey.) were planted in spacing of 1×1 m. Height growth and photosynthetic rate of seedlings were studied during the growth season, while the survival rate was calculated in the end of season. Data were analyzed using spilt split plot plan and SNK test. Results showed that survival rate of seedlings of all three species decreased with increasing gap size. Oak seedlings showed the highest survival rate in both large and medium sized gaps. The maple seedlings showed the lowest survival rate in the large gaps. The maximum height growth of seedlings was measured in the center of gaps; this was decreased in north, west, south and east edges of the gaps, respectively. The larger the gap size the higher was the height growth of alder and oak and seedlings, while that of maple was higher in the medium gaps. Therefore one can conclude that planting of oak and alder seedlings in the center of large gaps could bring more promising results, while planting of maple in the center of medium and edges of large gaps would be more effective.

کلیدواژه‌ها [English]

  • Height growth
  • photosynthetic rate
  • planting
  • Shastkolate forest
  • spatial location

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