تغییرات تنوع و غنای اشکوب علفی تیپ‌های جنگلی زاگرس میانی در ارتباط با ویژگی‌های اشکوب درختی و برخی متغیرهای خاک

نوع مقاله: علمی - پژوهشی

نویسندگان

1 دانشجوی دکترای جنگل‌شناسی و اکولوژی جنگل، دانشکده کشاورزی و منابع طبیعی دانشگاه لرستان، لرستان، ایران.

2 دانشیار، گروه جنگلداری، دانشکده کشاورزی و منابع طبیعی، دانشگاه لرستان، لرستان، ایران.

3 استادیار، گروه جنگلداری، دانشکده کشاورزی و منابع طبیعی، دانشگاه لرستان، لرستان، ایران.

4 استادیار، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.

چکیده

این پژوهش به بررسی تنوع و غنای آشکوب علفی تیپ­های جنگلی زاگرس میانی و ارتباط آن با مشخصه­های آشکوب درختی و برخی متغیرهای خاکی می­پردازد. بدین منظور اطلاعات آشکوب درختی تیپ­های جنگلی بلوط ایرانی، بلوط دارمازو و گلابی وحشی با استفاده از 24 قطعه­نمونه 500 مترمربعی و اطلاعات آشکوب علفی آنها با استفاده از 288 قطعه­نمونه یک مترمربعی تصادفی برداشت شد. در قطعات نمونه اصلی علاوه بر ویژگی­های فیزیوگرافی، تراکم، ارتفاع جست­گروه­ها و مقدار تاج­پوشش درختی، دو نمونه­ ترکیبی خاک از اعماق 0-10 و 10-30 سانتی­متری برداشت شد. در قطعات نمونه یک مترمربعی درصد حضور گونه­ها به‌عنوان معیاری از وفور ثبت شد. نتایج نشان داد به‌طور معنی­داری مقادیر غنا (کل، منهینیک و مارگالف) و تنوع گونه­ای (شانون-وینر و فیشر-آلفا) آشکوب علفی تیپ­ جنگلی بلوط دارمازو بیشتر از تیپ بلوط ایرانی است. ضمن اینکه تیپ­های مذکور فاقد اختلاف معنی­داری در شاخص­های غالبیت، یکنواختی و تنوع سیمپسون بودند. نتایج همبستگی پیرسون مقادیر غنا و تنوع گونه­ای با متغیرهای خاک نشان داد که تنوع و غنای گونه­ای تیپ­­های مورد بررسی با مقادیر رس، سیلت، آهک، کلسیم و اسیدیته خاک همبستگی مثبت نشان می­دهد.

کلیدواژه‌ها


عنوان مقاله [English]

Changes of understory species diversity and richness in relation to overstory and some edaphic factors in central Zagros forest types

نویسندگان [English]

  • Hamzeh Jafarisarabi 1
  • Babak Pilehvar 2
  • Kambiz Abrarivajari 3
  • Seyyd Mohamad Waezmousavi 4
1 Ph.D. candidate of Silviculture and Forest Ecology, Agriculture Faculty, Lorestan University, Khorramabad, I. R. Iran.
2 Associate Professor, Department of Forestry, Agriculture Faculty, Lorestan University, Khorramabad, I. R. Iran.
3 Assistant Professor, Department of Forestry, Agriculture Faculty, Lorestan University, Khorramabad, I. R. Iran.
4 Assistant Professor, Faculty of Forest Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, I. R. Iran.
چکیده [English]

This study explores the relationship between diversity of herbaceous understory of forest types with tree layer as well as some edaphhic factors in central Zagros. To do this, tree layer of the forest types were randomly sampled using 24 sample plots (500 m2) and herbaceous understory of these forest types were randomly sampled using 288 sample plots (1 m2) at the growing season. In main plots (tree layer), in addition to physiographic features, density, coppice shoots and tree canopy area, soil variables were measured from soil samples taken from the depths of 0-10 and 10-30 cm. In plots sampled from herbaceous understory (1 m2 plots), in addition to measuring species richness, the percentage of species was recorded as an indicator of the abundance. Results showed that the values of richness indices (total richness, Menhinic, and Margalef indices) and diversity indices (Shannon-Wiener and Alpha Fisher diversity) of herbacious layer in Quercus infectoria Oliv. Forest type was significantly higher than Q. brantii Lindl forest type. No difference was found among these types in terms of indicators of dominance, evenness and Simpson diversity indices. The results of Pearson correlation indicated that the richness and diversity indices of studied forest types is positively correlated with soil clay, silt, lime, calcium and acidity.

کلیدواژه‌ها [English]

  • Herbaceous layer
  • Biodiversity
  • Forest type
  • Forest soil
  • Centeral Zagros
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