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

نوع مقاله: پژوهشی

نویسندگان

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

چکیده

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.

کلیدواژه‌ها


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
  • Seyed Mohsen Hosseini
  • Masoud Tabari Kouchaksaraei
  • Yahya Kooch
Department of Forestry, Faculty of Natural Resources, Tarbiat Modares University, Noor branch, Noor, Iran.
چکیده [English]

Queues castanifoliais one of the most demanded species for reforestation in Golestan province. It is necessary to produce appropriate seedlings in nurseries.  This study was carried out to determine the effect of perlite on soil on growth and physiological responses of Queues castanifolia seedlings under water deficit stress. A factorial experiment was conducted as randomized complete block design in greenhouse condition of agricultural and natural resources research Center in Gorgan, 2015. Perlite treatments in 4 levels (0, 15, 25 and 35% (V/V)) was added in soil and water stress in 3 levels (40, 70 and 100% irrigation at field capacity) for 5 months were applied in the pot experiment. Some parameters including gas exchange (photosynthesis, stomatal conduction and transpiration) and 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. The results showed that all parameters were affected by different levels of irrigation and perlite. Water deficit to 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. It could be suggested that perlite application in soil is suitable for the production of desirable seedlings under water deficit condition.

کلیدواژه‌ها [English]

  • Soil Amendment
  • Drought stress
  • Leaf water potential
  • Gas exchange
  • Nursery
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