اثر آبیاری و سایه بر زی‌توده، سطح برگ و شادابی نهال تادار (Celtis caucasica Willd.)

نوع مقاله : علمی - پژوهشی

نویسندگان

1 کارشناسی ارشد جنگلداری، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران.

2 دانشیار، گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران.

3 استادیار، دانشکده منابع طبیعی و کویرشناسی، دانشگاه یزد، یزد، ایران

4 دکتری جنگلداری، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، تهران، ایران.

چکیده

این پژوهش با هدف بررسی اثر تیمارهای مختلف آبیاری و نور بر زی‌توده اندام هوایی و ریشه، سطح برگ و شادابی نهال تادار انجام شده‌ است. ابتدا 30 اصله درخت تادار در جنگل‌های اطراف روستای شوراب استان لرستان انتخاب شدند و از جهت­های مختلف آن بذرگیری شد. سپس در اواخر آبان اقدام به کاشت بذر در گلدان‌ها شد و بذرها در اوایل فروردین سال بعد جوانه زدند و پس از آن گلدان‌ها تا اوایل تیرماه هرروز آبیاری شدند. بعد از آن چهار تیمار آبیاری (هرروز، دو، سه و چهار روز یک‌بار) و سه تیمار سایه (نور کامل، نیم‌سایه و سایة کامل) با سه تکرار و 30 گلدان در هر تکرار (در مجموع 1080 واحد آزمایشی) به­مدت پنج ماه بر روی آنها اعمال شد. سپس طول، عرض و سطح برگ‌ها، زی‌تودة ریشه، زی‌تودة اندام هوایی و شادابی نهال‌ها اندازه‌گیری شد و با استفاده از تجزیه واریانس چند­طرفه و مدل آزمایش اسپلیت، داده‌ها مورد تحلیل قرار گرفت. نتایج نشان داد که اثرهای متقابل سایه و آبیاری بر زی‌توده، طول و عرض برگ معنی‌دار است (05/0p<). آبیاری در حالت نور کامل اثر معنی‌داری بر شادابی نهال‌ها دارد، اما در نیم‌سایه و سایة کامل این اثر معنی‌داری نیست و همچنین با کاهش نور دریافتی شادابی نهال‌ها کاسته می‌شود. با توجه به نتایج، می‌توان استنباط کرد که رشد و شادابی نهال‌ها در نور کامل مطلوب‌تر از دیگر تیمارهای سایه است و سطوح بالای نور برای رشد گونه تادار اهمیت دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of irrigation and shade on biomass, leaf area and viability of Celtis caucasica Willd. Seedlings

نویسندگان [English]

  • Fatemeh Asadi 1
  • Vahid Etemad 2
  • Gholamhosein Moradi 3
  • Asghar Sepahvand 4
1 M.Sc. of Forestry, Department of Forestry and Forest Economic, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran.
2 Associate Professor, Department of Forestry and Forest Economic, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran.
3 Assistant Professor, School of Natural Resources & Desert studies, Yazd University, Yazd, I. R. Iran.
4 Ph.D. of Forestry, Department of Forestry, Science and Research Branch, Islamic Azad University, Tehran, I. R. Iran.
چکیده [English]

This study was conducted to investigate effect of different irrigation and shade treatments on arial and root biomass, leaf area and viability of Caucasian hackberry Seedlings in Shorab nursery, Khoramabad, Lorestan province, Iran. Firstly, 30 Celtis caucasica trees was selected in around of Shorab village forests and then seeds were collected from different directions of trees. Seeds were planted on plots in November and budded in April next year and afterwards plots were irrigated daily until starting treatments. After that, four irrigation treatments (daily, once in every two, three and four days) and three shade treatments (full light, semi and full shade) with three replications and 30 pots per replicate (overally, 1080 expirmental units) were applied on them during five months period. Then, leaf length and width, leaf area, viability, arial and root biomass were measured and analysed in split test model by multi way ANOVA. Results showed interations of irrigation and shade have significant effects on biomass, leaf length and leaf width (p<0.05). Irrigation have significant effect on viability of seedlings in full light, but this effect is not significant in semi shade and full shade. Also, by reducing light, viability of seedlings is decreased. Regarding to results, could be inferred that growth and viability of seedlings are better in full light compared to other treatments which this shows Celtis caucasica is extremlly light demand species and high levels of light are important for its growth.

کلیدواژه‌ها [English]

  • Celtis caucasica
  • Drought stress
  • Light stress
  • Seedlings viability
  • Zagros forests

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پژوهش و توسعه جنگل
دوره 4، شماره 3
آذر 1397
صفحه 331-345

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