نوع مقاله : مقاله پژوهشی

نویسندگان

1 معاون پژوهش و فن آوری مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی

2 رئیس بخش تحقیقات منابع طبیعی مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی

3 مسئول امور آزمایشگاه های مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی

4 عضو هیأت علمی بخش تحقیقات منابع طبیعی مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی

چکیده

شناخت وضعیت خاک­ها، توجه به استعدادها و از طرفی محدودیت­های اراضی عامل کلیدی در اختصاص اراضی به مناسب­ترین کاربری و همچنین بهبود شرایط رشدی گیاهان کشت­شده در آن اراضی می­باشد. این تحقیق با هدف بررسی خاک­ها و شناخت محدودیت­های آن در جهت جلوگیری از زوال و خشکیدگی گونه سرو نقره­ای در فضای سبز جنگلی مجتمع فولاد مبارکه انجام شد. در این تحقیق ابتدا قطعات نمونه در اراضی فضای سبز جنگلی تحت کشت این گونه انتخاب شد. سپس اقدام به حفر و تشریح خاک­رخ در این قطعات گردید و از لایه­های این خاک­رخ­ها نمونه­برداری گردید. از برگ و خاک سایه­انداز درختان سالم و غیرسالم نمونه­برداری شد و بر روی نمونه­های خاک و گیاه تجزیه­های لازم انجام و تجزیه و تحلیل آماری نتایج انجام شد. نتایج نشان داد که اراضی این منطقه دارای انواع محدودیت­های خاکی شامل سنگریزه زیاد (بیش از 50 درصد)، کمبود مواد آلی (کمتر از 5/0 درصد) و عناصر غذایی پرمصرف و کم­مصرف، pH بالا (بیش از 9/7)، آهک زیاد (بیش از 50 درصد) و سختی و متراکم­بودن خاک می­باشد. میزان جذب آهن، منگنز، روی، مس، کلر و سدیم در سطح یک­درصد بین درختان سالم و ناسالم سرو معنی­دار شد. برای بهبود شرایط و جلوگیری از پیشرفت خشکیدگی و زوال درختان کشت­شده در این اراضی، مدیریت بهینه حاصلخیزی خاک و تغذیه گیاهان کشت شده و تهیه فرمول کودی برای هر قطعه و مصرف کودهای آلی توصیه می­گردد.

کلیدواژه‌ها

عنوان مقاله [English]

The role of soil limitations on the decline of Cypress (Cupressus arizonica L.) in 20 years old forest green space of Mobarake steel complex

چکیده [English]

Understanding the capability of soils and land use limitations is a key factor in allocating the lands to the most appropriate use and also improving the growth conditions of plants in those lands. This research aimed to study the soils and recognize their limitations in cypress forest of Mobarakeh Steel Complex in order to prevent deterioration and decline of the trees. In the first step, plots were selected in the forest and a soil profiles was drilled in each plot. Soil samples were collected from the profiles. Also, soil and leaf samples were collected from the canopy of the healthy and unhealthy trees, separately. The results indicated that the soils have variety of limitations, including high gravel content (more than 50%), lack of organic matter (less than 0.5%) and nutrients, high calcium carbonate and pH coupled with soil compaction. There was a significant difference in the uptake of iron, manganese, zinc, copper, chlorine and sodium from the soil between healthy and unhealthy cypress trees. To improve the soil conditions in order to prevent the decline of cultivated trees, soil fertility and plant nutrition management program should be considered in the study area. Also, the use of organic fertilizers is recommended.

کلیدواژه‌ها [English]

  • Land limitations
  • Nutrient elements
  • Soil fertility
  • Soil profile
  • Trees decline
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