اثر کود سیلیکا بر رشد، زی‌توده و جذب عناصر غذایی در نهال های گلدانی بلوط ایرانی (Quercus brantii Lindl.)

نوع مقاله : پژوهشی


1 بخش تحقیقات منابع طبیعی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی فارس، سازمان تحقیقات، آموزش و ترویج کشاورزی، شیراز. ایران.

2 بخش تحقیقات جنگل، موسسه تحقیقات جنگل‌ها و مراتع ایران، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

3 1بخش تحقیقات منابع طبیعی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی فارس، سازمان تحقیقات، آموزش و ترویج کشاورزی، شیراز. ایران.

4 کارشناس اداره کل منابع‌طبیعی و آبخیزداری استان فارس، شیراز. ایران


مطالعه فاکتورهای مختلف اثرگذار در جهت ارتقاء رشد نهال­های موجود در نهالستان و عرصه­های جنگل‌کاری از اهمیت زیادی برخوردار است. از طرفی، با وجود اینکه سیلیکون به عنوان یک عنصر ضروری در گیاهان شناخته نشده، اما اثرات مفید فراوانی بر گیاهان دارد. به همین منظور آزمایشی در قالب طرح کاملاً تصادفی در 5 سطح تیمار برای ارزیابی غلظت­های مختلف سیلیکا بر برخی پارامترهای رشد و جذب عناصر غذایی در نهال­های بلوط ایرانی طراحی و اجرا گردید. برای هر تیمار 10 گلدان در نظر گرفته شد و تیمارهای اعمال شده شامل سطوح شاهد و آبیاری با غلظت­های 50، 150، 350 و 500 میلی­گرم در لیتر سیلیکا (بر اساس ظرفیت زراعی) صورت گرفت. نتایج این مطالعه نشان داد که اگرچه سیلیکا بر مقدار قطر طوقه نهال­ها تاثیر معنی­دار آماری نداشت، اما حجم ریشه و قطر ساقه نهال­های تیمار شده با 500 میلی­گرم در لیتر سیلیکا تا بیش از 50% بیشتر از نهال­های شاهد بود. از سوی دیگر، نهال­هایی کوددهی شده با غلظت 500 میلی­گرم در لیتر سیلیکا دارای بیشترین زی‌توده خشک نسبت به شاهد و دیگر تیمارها بودند به­طوری­که حدود 68 تا 80 درصد افزایش در زی­توده برگ، ساقه و ریشه این نهال­ها نسبت به نهال­های شاهد مشاهده شد. بیشترین جذب عناصر نیتروژن، پتاسیم و کلسیم مربوط به تیمار 150 میلی‌گرم در لیتر بود. با این وجود، سیلیکا در غلظت­های پایین سبب کاهش جذب عناصر منگنز، مس و روی شد و در کل مقدار جذب آهن در حضور سیلیکا کاهش یافت. در نهایت می­توان اذعان داشت که استفاده از کود سیلیکا در این پژوهش سبب افزایش زی‌توده کل نهال‌های بلوط و همچنین افزایش جذب ماکروالمنت­ها شد که این یافته می­تواند در نهالستان­های جنگلی برای تولید نهال مورد عنایت قرار گیرد. با این وجود برای درک مکانیسم آن مطالعات تکمیلی از جمله آنالیز بیان ژن و پروتئین‌ها مورد نیاز است.


عنوان مقاله [English]

The impact of Silica fertilizer on growth, biomass and nutrient absorption of potted seedlings of Persian oak

نویسندگان [English]

  • Mehrdad Zarafshar 1
  • Seyed Kazem Bordbar 1
  • Mohammad Matinizadeh 2
  • Alireza Abbasi 1
  • Mohammadreza Negahdarsaber 3
  • Shahram Ahmadi 4
  • Saied Bahrami 4
  • Hassan Rezaie 4
1 Natural Resources Department, Fars Agricultural and Natural Resources Research and Education Center, AREEO, Shiraz, Fars, Iran
2 Forest Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.
3 Natural Resources Department, Fars Agricultural and Natural Resources Research and Education Center
4 the expert of general office of natural resources and watershed management in Fars Province, Shiraz, Iran
چکیده [English]

The study of various affecting factors in order to promote seedling growth at nursery and afforestation areas is very important. Although silicon is not recognized as an essential element in plants, it has very beneficial effects on plant species. For this purpose, an experiment was conducted following a completely randomized design with 5 treatments to evaluate different concentrations of silica on some growth parameters and nutrient uptake in Iranian oak seedlings. For each treatment, 10 pots were considered and treatments were performed including control and irrigation treatments with concentrations of 50, 150, 350 and 500 mg L-1 silica (based on field capacity). The result showed that silica had no statistically significant effect on basic diameter but root volume and stem diameter in seedlings treated with 500 mg L-1 were greatre around more than 50% in comparison with control seedlings. On the other hand, seedlings treated with 500 mg L-1 silica had the highest dry biomass compared to control and other treatments so that the leaf, stem and root biomass of the treatment were higher around 68-80% than control seedlings. The highest absorption of nitrogen, potassium and calcium were observed in 150 mg L-1 treatment. However, at low concentrations, silica decreased the uptake of manganese, copper and zinc and decreased the amount of iron uptake in the presence of silicon. Finally, it can be concluded that the use of silica in this study increased the total biomass of oak seedlings and also increased the absorption of macro elements so, the finding can be considered in forest nursery to seedling production. Nevertheless, further studies are needed to understand its mechanism, including gene and protein expression analysis.

کلیدواژه‌ها [English]

  • silicon
  • Forest seedling
  • Zagros forests
  • Fertilization
  • Nurseries
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