اثر افزودن پرلیت در خاک بر برخی ویژگی‎های رشد و فیزیولوژی نهال‏های بلندمازو (Quercus castaneifolia C.A.M.) تحت تنش کم‎آبی

نوع مقاله: پژوهشی


1 گروه جنگل‌شناسی و اکولوژی جنگل، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، واحد نور، نور، ایران

2 گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه تربیت مدرس ، تهران، ایران


تنش خشکی مهمترین تنش غیر زنده است که بر رشد، توسعه و عملکرد گیاهان تاثیر به‎سزایی دارد. این تحقیق به منظور بررسی اثر پرلیت، معرفی شده به عنوان اصلاح کننده خاک، روی پاسخ‎های رشد و فیزیولوژیکی نهال‎های بلندمازو تحت تنش کم‎آبی انجام شد. به این منظور آزمایشی در قالب طرح کامل تصادفی در شرایط گلخانه در مرکز تحقیقات کشاورزی و منابع طبیعی گرگان اجرا گشت. نهال‎های مورد نظر در بستر‎های مختلف پرلیت شامل صفر (بدون پرلیت)، 15، 25 و 35 درصد در خاک به مدت 5 ماه تحت تنش کم‎آبی در سه سطح 40، 70 و 100 درصد ظرفیت زراعی قرار گرفتند. اندازه‏گیری تبادلات گازی شامل فتوسنتز، هدایت روزنه‎ای و تعرق و نیز پتانسیل آبی برگ، رویش قطری و ارتفاعی و وزن خشک ریشه، ساقه، برگ نهال‏های بلندمازو در تیمارهای مختلف در آخر دوره انجام شد. نتایج نشان داد که اثر سطوح مختلف تنش رطوبتی و پرلیت بر صفات مورد بررسی معنی‎دار بود. کمبود آب تا 40 درصد ظرفیت زراعی سبب کاهش 51 و 68 درصد به ترتیب در میزان فتوسنتز وهدایت روزنه‎ای برگ نهال‎های بلندمازو شد. بیشترین میزان رویش قطری، طولی و وزن خشک نهال‎های بلندمازو در شرایط عادی و تنش به ترتیب در تیمار 25 و 35 درصد پرلیت مشاهده گشت. نتایج این تحقیق نشان داد افزودن پرلیت به خاک (25 درصد) در رشد نهال‎های بلندمازو مؤثر بود و ویژگی‎های فیزیولوژیکی را در شرایط تنش کم‌آبی بهبود بخشید.


عنوان مقاله [English]

Effect of adding perlite in soil on some growth and physiology characteristics of Queues castanifolia seedlings under water deficit stress

نویسندگان [English]

  • zohreh zoghi 1
  • Seyed Mohsen Hosseini 2
  • Masoud Tabari Kouchaksaraei 2
  • Yahya Kooch 2
1 Department of Forestry and Forest Ecology, Faculty of Natural Resources, Tarbiat Modares University, Noor Branch, Noor, Iran
2 Department of Forestry, Faculty of Natural Resources, Tarbiat Modares University, Noor Branch, Noor, Iran
چکیده [English]

Draught stress is the most important abiotic stress significantly affecting plants’ growth, development, and performance. This study was carried out to determine the effect of perlite, as a modifying element of soil, on growth and physiological responses of Queues castanifolia seedlings under water deficit stress. A factorial experiment was conducted as randomized complete block design under greenhouse condition of the Agricultural and Natural Resources Research Center in Gorgan, 2015. Perlite treatments at 4 levels (0, 15, , and 35% (V/V)) were added in soil and water stress at 3 levels (40, 70, and 100% irrigation at field capacity) were applied in the pot experiment for 5 months. Some parameters including gas exchange (photosynthesis, stomatal conduction, and transpiration), leaf water potential of seedlings, diameter and height growth, and dry weight of root, stem, leaf, and seedlings were measured in different treatments at the end of the experiment period. Results showed that all parameters were affected by different levels of irrigation and perlite. Water deficit by 40% FC reduced 51% and 68% of photosynthesis and stomatal conductance, respectively. The highest diameter and height growth and dry weight of the seedlings were observed in 25% and 35% (V/V) perlite application under normal and stress conditions, respectively. The use of perlite alleviated the negative effects of water deficit and ameliorated seedling growth. The findings suggest that perlite application in soil is suitable for the production of desirable seedlings under water deficit condition.

کلیدواژه‌ها [English]

  • Drought stress
  • Gas exchange
  • Leaf water potential
  • Nursery soil amendment
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