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اثر شدت نامنظمی های پوشش تاجی در عرصههای جنگلی بر جوانهزنی بذر گونههای راش (Fagus orientalis) و ممرزCarpinus betulus)) در جنگلهای هیرکانی | ||
| علوم و فناوری بذر ایران | ||
| مقاله 16، دوره 7، شماره 2 - شماره پیاپی 14، بهمن 1397، صفحه 219-236 اصل مقاله (1 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/ijsst.2019.110231.1080 | ||
| نویسندگان | ||
| جواد میرزایی* 1؛ مهدی حیدری1؛ شیرزاد گرایلی2؛ وحید اعتماد3؛ مهرداد زرافشار4 | ||
| 1هیات علمی دانشگاه ایلام | ||
| 2دانشجوی دکتری- دانشگاه ایلام | ||
| 3گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران | ||
| 4بخش تحقیقات منابعطبیعی، مرکز تحقیقات و آموزش کشاورزی و منابعطبیعی فارس، سازمان تحقیقات، آموزش و ترویج کشاورزی، شیراز، فارس، ایران | ||
| چکیده | ||
| به منظور شناخت اثر آشفتگیهای پوشش تاجی بر کمیت و کیفیت جوانهزنی بذر درختان جنگلی، بذر دو گونه تجاری جنگلهای شمال ایران شامل راش و ممرز از روشنههای طبیعی و مصنوعی با مساحتهای مختلف جمعآوری و صفات جوانهزنی آنها بررسی شد. در این راستا، تعداد 48 روشنه در یک تیپ راشستان آمیخته در طرح جنگلداری حاجیکلا- تیرانکلی از حوزه آبخیزرودخانه تجن-ساری شناسایی شد. روشنهها در سه کلاسه مساحت شامل کمتر از 150 (کوچک)، 350-150 (متوسط) و 500-350 (بزرگ) مترمربع طبقه بندی شده و بذر گونههای راش و ممرز از داخل روشنه و از توده مجاور آنها بعنوان شاهد جمعآوری و بلافاصله آزمون جوانهزنی بر روی آنها انجام شد. درصد جوانهزنی، سرعت جوانهزنی و میانگین زمان جوانهزنی برای تمامی بذرها محاسبه و مورد تجزیه و تحلیل آماری قرار گرفت. مقایسه نتایج بدست آمده نشان داد که بین صفات جوانهزنی دو نوع روشنه طبیعی و مصنوعی اختلاف قابل ملاحظه-ایوجود ندارد در حالی که بذرهای جمع آوری شده از هر دو گونه از داخل روشنههای متوسط و بزرگ، درصد جوانهزنی و گاهی اوقات سرعت جوانهزنی بیشتری داشتند. بنظر میرسد که شرایط بهینه محیطی از قبیل رطوبت، دما و نور در داخل روشنههای بزرگتر از 150 مترمربع در جهت حفظ کیفیت بذرهای راش و ممرز فراهمتر میباشد. پیشنهاد میگردد که تحقیق مشابه بر روی بذر سایر درختان جنگلی نیز مورد توجه قرار گیرد. | ||
| کلیدواژهها | ||
| روشنه تاجپوشش؛ بذر؛ جوانه زنی؛ شرایط محیطی | ||
| عنوان مقاله [English] | ||
| Effect of Disturbance Intensity of Canopy Gap in Forest Stands on Seed Germination of Beech (Fagus orientalis) and Hornbeam (Carpinus betulus) Trees at Hyrcanian Forest | ||
| نویسندگان [English] | ||
| javad mirzaei1؛ mehdi heydari1؛ shirzad Gerayli2؛ vahid Etemad3؛ mehrdad zarafshar4 | ||
| 1Ilam university | ||
| 2Ph.D student, Ilam University | ||
| 3Department of Forestry and Forest Economic, Faculty of Natural Resources, Tehran University | ||
| 4Department of Natural Resources Research, Fars Agricultural and Natural Resources Research and Education Center, AREEO, Shiraz, Fars, Iran | ||
| چکیده [English] | ||
| To understanding of effect of canopy gap disturbance on quantity and quality of seed germination of forest trees, seeds of two economic trees in Hyrcanian forest including Fagus orientalis and Carpinus betulus were collected from some canopy gaps with different sizes and their germination parameters were studied. In this regard, 48 canopy gaps were identified from a mixed Fagetum stand at Hajikola-Tirankli forestry plan from Tajan River watershed. In the following, the canopy gaps were classified to three difference size classes such as smaller than 150 (small), 150-350 (moderate) and 350-500 m2 (large) and the seeds of the Beech and Hornbeam were collected from inside and outside of the canopy gaps and seed germination test were done on the collected seeds. Seed germinant percent, germination speed and mean seed germination time were calculated and then statistically analyzed. Comparison of the collected data showed that there is no considerable difference between natural and artificial canopy gaps in aspect of seed germination parameters while for both species, collected seeds from moderate and large canopy gaps had higher seed germination and sometimes germination speed. It seems that optimal environmental condition such as moisture, temperature and light is better provided in canopy gaps bigger 150 m2 for seed germination of both species. Same research would be suggested on the other tree species. | ||
| کلیدواژهها [English] | ||
| Canopy gaps, seed, germination, Environmental condition | ||
| مراجع | ||
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