ارزیابی روش کشت گلخانه‌ای مطالعه بانک بذر خاک در دو حالت با شستشو و بدون شستشو

نوع مقاله : علمی- پژوهشی

نویسندگان

1 کارشناس ارشد جنگل‌داری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

2 دانشیار، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

3 استادیار، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

چکیده

هدف از پژوهش پیش‌رو، ارزیابی نتایج بانک بذر خاک در جنگل جلگه‌ای دانشگاه تربیت مدرس با استفاده از دو روش با شستشو و بدون شستشو بود. برای این منظور، چهار قطعه‌نمونه 40×40 متر مربعی که هریک شامل چهار قاب فرعی 400 متر مربعی بودند، به‌عنوان توده معرف انتخاب شدند. نمونه‌برداری از پوشش گیاهی روزمینی در 16 قطعه‌نمونه 400 متر مربعی در دو زمان اسفند و خرداد انجام شد. مطالعه بانک بذر خاک نیز با استفاده از روش کشت گلخانه‌ای به‌مدت هفت ماه براساس 64 (2 روش × 4 قطعه‌نمونه × 4 تکرار × 2 عمق صفر تا پنج و پنج تا 10 سانتی‌متری) نمونه خاک 40×40 سانتی‌متر مربعی انجام شد. تجزیه و تحلیل آماری با استفاده از طرح قطعه‌نمونه‌های خردشده در مکان در قالب طرح بلوک کامل تصادفی انجام شد. نتایج نشان داد که اندازه و غنای گونه‌ای بانک بذر خاک در روش بدون شستشو (در عمق اول 63 گونه و 1872 بذر در هر متر مربع و در عمق دوم 46 گونه و 975 بذر در هر متر مربع) به‌طور معنی‌داری بیشتر از روش با شستشو (در عمق اول 45 گونه و 1137 بذر در هر متر مربع و در عمق دوم 33 گونه و 699 بذر در هر متر مربع) بود. نتایج همچنین نشان داد که در هر دو روش مطالعه، با افزایش عمق خاک از درجه تشابه گونه‌ای بانک بذر خاک و پوشش گیاهی متناظر کاسته می‌شود، اما در این رابطه نتایج این دو روش با یکدیگر اختلاف معنی‌داری را نشان نداد. به‌طور کلی نتایج پژوهش پیش‌رو نشان داد که در مطالعه بانک بذر خاک استفاده از روش کشت گلخانه‌ای بدون شستشو نسبت به روش با شستشو به‌دلیل ارایه نتایج بهتر در اولویت است.

کلیدواژه‌ها

عنوان مقاله [English]

Assessment of seedling emergence method in soil seed bank in two states of washing and non-washing

نویسندگان [English]

  • Fateme Akbarpour 1
  • Seyyed Gholam Ali Jalali 2
  • Omid Esmaeilzadeh 3
1 M.Sc. Forestry, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University
2 Associate Prof., Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University
3 Assistant Prof., Faculty of Natural Resources and Marine Science, Tarbiat Modares University
چکیده [English]

This study aimed to evaluate the results of soil seed bank in Tarbiat Modares Lowland Experimental Forest by using the two methods of washing and non-washing. Therefore, four main plots (40×40 m2)with each of them comprising 4 sub quadrats of 400 m2 were considered as representative stands. Aboveground vegetation was sampled by 16 plots of 400 m2 in two time steps of March and June. Seed bank flora was studied using seedling emergence method based on 64 soil samples (2 methods×4 main plots×4 replications×2 depths of 0-5 and 5-10 cm) which had been hammered by a hollow 400 cm2 metal frame. Statistical analysis was performed using split plot in space set within a randomized complete block experimental design. Results showed that both species richness and density of soil seed bank in non-washing method (63 species with 1872 seed density per m2 in upper layerand 46 species with 975 seed density in lower layer) were significantly higher than in washing method (45 species with 1137 seed density per m2 in upper layerand 33 species with 699 seed density in lower layer). Results also showed that similarity between soil seed bank with corresponding extant vegetation decreased with increasing soil depth. However, the two methods were not significantly different. We concluded that seedling emergence method without washing results in better soil seed bank assessment.

کلیدواژه‌ها [English]

  • Soil seed bank
  • similarity
  • lowland forest of Tarbiat Modares
  • soil washing

مراجع

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تحقیقات جنگل و صنوبر ایران
دوره 24، شماره 1 - شماره پیاپی 63
فروردین 1395
صفحه 175-163

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