پاسخ‏ های مورفو‌ـ فیزیولوژی نهال‏ های اقاقیا (.Robinia pseudoacacia L) به تنش خشکی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش‌آموختة کارشناسی ارشد جنگل‌داری، دانشگاه تربیت مدرس، نور، ایران

2 استاد، گروه جنگل‌داری، دانشگاه تربیت مدرس، نور، ایران

چکیده

هدف این تحقیق بررسی پاسخ‏های‏ مورفوـ فیزیولوژی نهال ‏اقاقیا تحت تنش خشکی (دورة آبیاری در سطوح 4، 8، 12 و 16 روزه) بود. آزمایش در قالب طرح کاملاً تصادفی در محیط گلخانه صورت گرفت. نتایج نشان‌دهندة معنا‏داری کلیة صفات بررسی‌شده تحت تنش (غیر از کارایی مصرف آب) بود. بیشترین مقدار در اغلب صفات اندازه‏گیری‌شده به تیمار آبیاری 4 روزه اختصاص داشت. بزرگ‌ترین اندازة طول ریشه متعلق به نهال‏های آبیاری 12 روزه و بزرگ‌ترین اندازة وزن خشک ریشه متعلق به نهال‏های دورة آبیاری 4 و 8 روزه بود. بالاترین میزان کارایی آب نهال‏ها به آبیاری 8 روزه و بیشترین میزان نشت الکترولیت برگ‏ها به آبیاری 16 روزه اختصاص داشت. به‌طور‌کلی، نهال‏های با دورة آبیاری 4 روزه بهترین پاسخ‏های مورفوـ فیزیولوژی را به تنش خشکی نشان دادند. البته، از نظر صفات مطالعه‌شده، به‌ویژه زنده‏مانی و اندازه‏های رویشی، نهال‏ها به تیمار آبیاری 8 روزه (با اختلاف کمی نسبت به دورة آبیاری 4 روزه) پاسخ به نسبت خوبی به تنش خشکی نشان دادند؛ طوری‌که این تیمار می‏تواند به‌منزلة دور آبیاری قابل قبول و اقتصادی مد نظر قرار گیرد. پژوهش‏های مشابه می‏تواند در نهالستان‏های جنگلی با اقالیم سازگار این گونه صورت گیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Morpho-Physiological Responses of Black Locust (Robinia pseudoacacia L.) Seedlings to Drought Stress

نویسندگان [English]

  • naser norouzi haroni 1
  • Masoud Tabari koochksaraee 2
1 M.Sc. Student of Forestry, Faculty of Natural Resources, Tarbiat Modares University, Noor, I.R. Iran
2 ; Professor, Faculty of Natural Resources, Tarbiat Modares University, Noor, I.R. Iran
چکیده [English]

This study was conducted to study of morpho-physiological responses of Robinia pseudoacacia L. seedlings under drought stress by irrigation period at 4 levels (intervals of 4, 8, 12 and 16 days). The experiment was performed as completely randomized design in a greenhouse environment. Results indicated that all studied traits were affected by water stress, except water use efficiency (WUE). The greatest value of most traits was observed in 4-day irrigation. Seedlings treated by 12- day irrigation had the largest root length. The biggest root dry weight belonged to seedlings irrigated in intervals of 4 and 8 days. Irrigation periods of 8 and 16 days remained the highest water use efficiently (WUE) and electronic leakage (EL) for seedlings, respectively. Generally, seedlings with 4-day irrigation period indicated the best response to drought stress. Of course, 8-day irrigation period showed a relatively well response to water stress especially in terms of survival and growth parameters whereas it can be considered as an appropriate and economic irrigation. Similar investigations can be performed in forest nurseries where climate is adapted for R. pseudoacacia growing.

کلیدواژه‌ها [English]

  • Black locust
  • Drought stress
  • Growth
  • Irrigation period
  • photosynthesis
  • electrolyte leakage
 

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