میزان تغییرات ترکیبات ثانویه تحت ‌تنش خشکی در نهال‌‌های بلوط برودار، دارمازو و وی‌ول

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد دانشگاه یاسوج

2 استادیار، عضو هیئت علمی دانشکدة کشاورزی و پژوهشکدة منابع طبیعی دانشگاه یاسوج

چکیده

تولید ترکیبات ثانویه در برابر تنش‌های محیطی به‌عنوان سدی دفاعی است. این موارد عمدتاً ترکیبات فنولی از‌جمله اسیدهای فنولی، تانن‌‌ها و لیگنین هستند. در تحقیق حاضر، سه گونة بلوط زاگرس (برودار، دارمازو و وی‌ول) تحت تنش خشکی آزمایش شد. برای این منظور، نهال‌ها بدون اینکه در گلدان مطالعه‌ای انجام شود و در شرایط کاملاً یکسان و در فضای باز کاشته شدند. سپس، زمانی‌که نهال‌‌ها چهارماهه بودند، آبیاری قطع شد تا خاک گلدان‌‌ها به‌تدریج به ظرفیت مزرعه‌‌ای 70% (تیمار ضعیف)، 50% (تیمار متوسط) و 30% (تیمار شدید) طی پانزده‌روز رسیدند. پس از برداشت نهال‌ها در هر مرحله از آزمایش، ذی‌‌تودة کل و میزان ترکیبات ثانویة مختلف (فنول کل، تانن کل، تانن متراکم) برگ نهال‌ها اندازه‌‌گیری شدند. نتایج نشان داد که تنش خشکی، میزان ذی‌‌توده را به‌‌طور معنی‌‌داری کاهش داد. نتایج ترکیبات ثانویة مختلف در گونه‌‌های مختلف نیز نشان داد که تنها تانن کل گونة بلوط ایرانی در معرض تنش خشکی ضعیف با کنترل تفاوت معنی‌داری داشت. همچنین در تنش خشکی شدید نیز تانن متراکم و فنول کل نسبت به کنترل در هر سه‌گونه تغییر افزایشی غیرمعنی‌دار داشت؛ اما میزان تانن کل تحت‌ تنش خشکی شدید نسبت به کنترل تنها در گونة برودار به‌طور قابل‌توجهی بیشتر بود. همچنین درصد زنده‌‌مانی گونة برودار نیز از دو گونة دیگر بالاتر بود؛ بنابراین، به‌‌نظر می‌‌رسد که یکی از مکانیسم‌‌های مؤثر در مقاومت به خشکی افزایش میزان تانن کل باشد که در گونة برودار مشاهده شد و سبب حفظ زنده‌‌مانی بالاتر در این گونه شد. 

کلیدواژه‌ها


عنوان مقاله [English]

An Investigation on Trends of Annual and Seasonal Rainfall and Temperature in Different Climatologically Regions of Iran

نویسندگان [English]

  • Mona Nazari 1
  • Roghayeh Zolfaghari 2
  • Payam Fayyaz 2
1 M.SC forestry student of Yasouj University
2 Assistant Professor of Yasouj University
چکیده [English]

Climate change is defined as long term and irreversible changes in the climatic behavior
of a region. Many studies have been conducted in different regions of the world on climate
change. The results of these studies show considerable changes in climatic factors especially
in precipitation and temperature. In this research, the trend of changes in annual and seasonal
rainfall and temperature in 24 synoptic stations over a 50-year data period (1956-2005) was
investigated in Iran. The Mann- Kendall test and linear regression technique were used to analyze
the trend of changes in climatic factors. The results showed both increasing and decreasing
trends in annual rainfall at various regions of Iran. Annual rainfall in northern slopes of Alborz
and western slopes of the Zagros Mountain as well as in eastern and southeast parts of Iran had
a decreasing trend while in the central of Iran the trend of changes was increasing. In southern
region of Iran the rainfall had an increasing trend. The results also showed that temperature in
most of the studied stations over the considered period was increasing. The highest and lowest
changes in temperature were seen in the mean temperature of summer and winter, respectively.
Ahwaz and Khorramabad stations had a decreasing trend and over all seasons would go toward
more cooling. The temperature trend in Oromiye was decreasing in autumn and summer while
Shahrekord and Bandar abbas had the same trend in summer and winter.

کلیدواژه‌ها [English]

  • climate change
  • Iran
  • linear regression
  • Mann-Kendall Test
  • trend
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