رویش و زنده‌مانی نهال بید سفید (Salix alba L.) تحت تنش کم آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد جنگلداری دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

2 هیات علمی گروه جنگلداری دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

3 .

4 پژوهشگر مرکز پژوهش و توسعه امور نخبگان سازمان اتکا

چکیده

بیدها به‌دلیل تندرشد بودن، نیاز غذایی کم، و مقاومت در برابر بسیاری از آلودگی‌ها و تنش‌های محیطی، گونه‌هایی مطلوب برای توسعۀ فضای سبز و کاهش تخریب محیط زیست محسوب می‌شوند. هدف این پژوهش بررسی واکنش گونۀ بید سفید (Salix alba L.) به شرایط کم‌آبی بوده است. این تحقیق در قالب طرح کاملاً تصادفی با پنج دور آبیاری (2، 4، 6، 8 و 10 روز) در سه تکرار (هر تکرار حاوی پنج گلدان) به‌مدت چهار ماه در دانشکدۀ منابع طبیعی دانشگاه تربیت مدرس (شهرستان نور) انجام گرفت. نتایج، بیانگر زنده‌مانی زیاد نهال‌ها بود، به‌طوری که حتی تحت تنش کم‌آبی شدید (دورۀ آبیاری ده‌روزه)، زنده‌مانی همواره از 73 درصد بیشتر بود. با افزایش تنش خشکی از رویش طولی و قطری، زی‌تودۀ اندام هوایی و زمینی، تعداد برگ و حجم ریشه کاسته شد، اما تغییری در اندازۀ سطح برگ، سطح ویژۀ برگ، طول ریشه و نسبت طول ریشه به ساقه ایجاد نشد. نظر به رعایت اقتصاد منابع آب و اینکه نهال‌های بید سفید توانستند زنده‌مانی زیاد (100 درصد) و رویش مطلوبی در دور آبیاری شش تا هشت‌روزه به‌دست آورند، این دوره‌های آبیاری برای پرورش نهال این گونه در این منطقه یا مناطق اقلیمی مشابه مناسب‌اند.

کلیدواژه‌ها


عنوان مقاله [English]

Growth and Survival of Willow Seedling (Salix alba L.) Under Water Deficit Stress

نویسندگان [English]

  • mahin barshan 1
  • Masoud Tabari Kouchaksaraei 2
  • Seyed Ehsan Sadati 3
  • Reza Shahhoseini 4
1 M.Sc. student, Department of Forestry, Faculty of Natural Resources and Marine science, Tarbiat Modares University
2 Department of Forestry, Faculty of Natural Resources and Marine sciences, Tarbiat Modares University
4 Researcher of advance research and development of elite center
چکیده [English]

Willows due to the rapid growth rate, low nutrient requirements, resistance to many pollutants, and environmental stresses are ideal candidates for developing the landscapes and reducing the environmental degradation. The purpose of this study was to determine the response of Salix alba seedling to water deficit conditions. This experiment was set up as complete randomized design with five irrigation periods (2, 4, 6, 8 and 10 days) in three replicates (each replicate containes five pots) for four months. Results indicated a high survival rate for Salix seedlings, whereas under extremely drought stress (10-day irrigation) it was always greater than 73%. Height and collar diameter growth, above-ground and under-ground biomass, number of leaves and root volume decreased with increasing the irrigation period but no changes occurred in leaf area, specific leaf area, root length and root:shoot ratio. Regarding to the economy of water resources, 6- and 8-day irrigation periods, due to high survival (100%) and favorable growth of seedlings, can be considered for raising salix alba seedlings in this region and/or in climatic regions similar to the research site.

کلیدواژه‌ها [English]

  • diameter growth
  • Drought stress
  • Survival
  • white willow
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