اثر هرس ریشه بر فیزیولوژی و مورفولوژی نهال ارس (Juniperus excelsa M.Bieb.)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی ‏دکتری، گروه جنگل‌داری دانشکدة منابع‏ طبیعی و علوم‏ دریایی دانشگاه تربیت‏ مدرس، نور، ایران

2 استادیار مرکز تحقیقات کشاورزی و منابع طبیعی خراسان رضوی، مشهد، ایران

3 کارشناس ‏ارشد مدیریت ‏بیابان، دانشگاه ‏علوم‏ کشاورزی و منابع ‏طبیعی گرگان، گرگان، ایران

چکیده

به‏منظور بررسی اثر هرس ریشه بر ویژگی‏های فیزیولوژیکی و مورفولوژیکی نهال‌های ارس، آزمایشی روی نهال‌های یکسالة بازکاشتی آن انجام گرفت. تیمارهای اعمال‌شده شامل شدت هرس ریشه (1. هرس ملایم (حدود 8 سانتی‌متر انتهایی ریشه قطع شد)؛ 2. هرس شدید (حدود 15 سانتی‌متر انتهایی ریشه قطع شد)؛ 3. شاهد (بدون هرس ریشه)) بوده ‏است که در قالب طرح کاملاً تصادفی انجام شد. هر تیمار شامل سه تکرار و هر تکرار شامل 20 نهال است (در‌مجموع 180 نهال). نتایج بررسی‏ها نشان‏داد که هرس ریشه موجب بهبود کیفیت نهال، رشد ریشه و افزایش زنده‏مانی نهال‌ها شد. نتایج همبستگی‏ها نشان‏دادند که طول ریشه، قطر ریشه، بیوماس ریشه، بیوماس ساقه و بیوماس کل با شاخص کیفی نهال همبستگی معناداری دارند. با افزیش این عوامل، کیفیت نهال بهبود می‏یابد. همچنین، نسبت بیوماس ریشه به ساقه رابطة مثبت معناداری با زنده‏مانی نهال‌ها دارد. زنده‏مانی نهال‌ها با افزایش نسبت ریشه به ساقه بهبود یافته ‏است. با توجه به نتایج این تحقیق می‏توان عنوان کرد که ریشة نهال‌های ارس از هرس‌پذیری خوبی برخوردارند و هرس ریشه، موجب بهبود وضعیت کیفی نهال‌های ارس می‏شود. همچنین، با توجه به اینکه بین شاخص کیفی نهال‌ها و قطر یقة آن‌ها همبستگی به‌نسبت قوی وجود دارد و از طرفی سایر مشخصه‏های مهم از قبیل طول ریشه و بیوماس ریشه برای اندازه‌گیری مشکل است، می‏توان گفت که قطر یقه، شاخص مناسبی برای طبقه‏بندی کیفی نهال‌های ارس در نهالستان است.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Root Pruning On Physiology and Morphology of Greek Juniper Seedlings (Juniperus Excelsa M. Bieb.)

نویسندگان [English]

  • Hadi Darroudi 1
  • Ebrahim Khosrojerdi 2
  • Masoumeh Shahabi 3
1 Ph.D Student, Department of Forestry, Faculty of Natural Resources, Tarbiat Modares University, Nour, I.R. Iran
2 Assistant Professor of Agriculture And Natural Resources Research Center of Khorasan Razavi Province, Mashhad, I.R. Iran
3 M.Sc. Graduated student of Arid zone management, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, I.R. Iran
چکیده [English]

In order to investigate the effect of root pruning in morphological and physiological characteristics of Juniperus excelsa seedlings an experiment was carried out on transplanted one year-old seedlings. Treatments included root pruning intensities (1-slight pruning (2-moderate pruning and 3- control (no root pruning)) .Experiment design was completely randomized design. Each treatment included three replicates and each replicate included 20 seedlings (in total 180 seedlings). The results showed that root pruning improved the quality and growth of root and seedlings survival. Results indicated that root pruning enhanced seedling quality index of J. excelsa seedlings and had a good capability for pruning. Root length, root diameter, root biomass, shoot biomass and total biomass were significantly correlated with habitat quality index which increasing these factors improves plant quality. The ratio of root to shoot biomass and total biomass was significantly correlated with plant survival. Survival was improved by increasing these factors. Also, according to high correlation between quality index and root collar diameter and on the other hand, another characteristics such as root length, root biomass is so hard to identification, root collar diameter is suitable index for qualitative classification Juniperus excelsa seedlings in nurseries.

کلیدواژه‌ها [English]

  • Juniperus excelsa
  • Morphology
  • root pruning
  • Survival

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