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اثر اندازه و موقعیت‌های داخلی روشنه تاج بر رشد و زنده‌مانی نهال‌های بلندمازو (Quercus castaneifolia)، شیردار (Acer cappadocicum) و توسکای ییلاقی (Alnus subcordata) | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 10، دوره 25، شماره 2 - شماره پیاپی 68، تیر 1396، صفحه 275-285 اصل مقاله (315.75 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2017.111762 | ||
| نویسندگان | ||
| احمد عبدالهی1؛ علیرضا علی‌عرب2؛ پژمان پرهیزکار* 3؛ علی‌اکبر محمدعلی پورملکشاه4 | ||
| 1کارشناس ارشد جنگلشناسی و اکولوژی جنگل، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران | ||
| 2استادیار، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران | ||
| 3استادیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران | ||
| 4دانشجوی 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 | ||
| جنگل شصت‌کلاته؛ رشد ارتفاعی؛ سطح فتوسنتزی؛ موقعیت مکانی؛ نهال‌کاری | ||
| 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 Abdolahi1؛ Ali Raza Ali Arab2؛ Pejman Parhizkar3؛ Ali Akbar Mohammad Ali Pourmalekshah4 | ||
| 1M.Sc. Silviculture and Forest Ecology, Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran | ||
| 2Assistant Prof., Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran | ||
| 3Assistant Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran | ||
| 4Ph.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 | ||
| مراجع | ||
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