آثار غرقابی طولانی‏مدت خاک بر تبادلات گازی برگ و رشد نهال‏های صنوبر دلتوئیدس و دارتالاب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد جنگل‌داری، دانشگاه تربیت مدرس، نور، ایران

2 دانشیار گروه جنگل‌داری، دانشگاه تربیت مدرس، نور، ایران

چکیده

در این پژوهش آثار غرقابی بر ویژگی‏های مورفولوژیکی و تبادلات گازی نهال‏های صنوبر دلتوئیدس کلن 51/77 و دارتالاب در یک دورة 450 روزه در منطقه‏ای با اقلیم خیلی مرطوب بررسی شد. نهال‏ها تحت شرایط غرقابی 3 سانتی‏متر و 15 سانتی‏متر بالای سطح خاک و تیمار شاهد (آبیاری بر اساس ظرفیت زراعی خاک) در یک آزمایش صحرایی بررسی شدند. در پایان دوره، زنده‏مانی و رویش ارتفاعی نهال‏های دارتالاب تحت تنش غرقابی تغییری نکرد (P<0.01)، اما در صنوبر در تیمار غرقابی عمقی کاهش یافت (P<0.01). تحت تأثیر غرقابی، رویش قطری در گونة دارتالاب افزایش و در صنوبر کاهش یافت. سطح برگ، تجمع زی توده، و تبادلات گازی (فتوسنتز، هدایت روزنه، و تعرق) برگ در هر دو گونه در شرایط غرقابی کاهش یافت. به‌طور کلی، اگرچه در شرایط غرقابی در هر دو گونه در اغلبِ پارامترهای مورفو ـ فیزیولوژی میزانی افت مشاهده می‏شود، به‌علت رضایت‌بخش‌بودن برخی دیگر از پارامترها همانند زنده‌مانی، رویش ارتفاعی، و زی تودة ساقه در دورة 450 روزه، می‏توان انتظار داشت که امکان رویش و ماندگاری هر دو گونه در شرایط غرقابی برای سال‏های آینده متصور باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Influences of Prolonged Soil Flooding on Leaf Gas Exchanges and Growth of Populusdeltoides and Taxodiumdistichum Seedlings

نویسندگان [English]

  • Ehsan Ghanbary 1
  • Masoud Tabari 2
1 MSc. in Forestry, Faculty of Natural Resources, Tarbiat Modares University, Noor, I.R. Iran
2 Associate Professor, Faculty of Natural Resources, Tarbiat Modares University, Noor, I.R. Iran
چکیده [English]

The effects of 450-days of flooding on morphological and gas exchanges responses were investigated under controlled conditions for Populus deltoides (colon 77.51) and Taxodium distichum seedlings. Seedlings were subjected to three outdoor treatments: not flooded (control), flooded to 3 cm above the soil surface (shallow flooded), and flooded to 15 cm above the soil surface (deep flooded). Flooding had no significant effect on the height growth and survival of T. distichum seedlings during 450-day period, but survival and height growth of deep flooded seedlings in P. deltoides were decreased. Under flooding conditions diameter growth increased in T. distichum and decreased in P. deltoides. Leaf area and biomass accumulations reduced by flooding in both species. Flooding reduced net photosynthesis, stomata conductance and transpiration in both species. Overall, even though at flooding status in both species some morpho-physiological variables reduced but due to satisfactory of some other variables like survival, height growth and shoot biomass in 450 days of experiment, possibility of growth and survival of seedlings will be excepted.

کلیدواژه‌ها [English]

  • Leaf area
  • photosynthetic
  • Stomata conductance
  • Survival
  • Transpiration

مراجع

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