مقایسه مراحل تحولی توده راش- ممرز با استفاده از شاخص‌های غیرمکانی ساختار توده

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه جنگل‌شناسی و اکولوژی جنگل، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

2 دانشیار، گروه جنگل‌شناسی و اکولوژی جنگل، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

3 استادیار پژوهش، مؤسسه تحقیقات جنگل‌ها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

چکیده

تحول ساختار توده‌های جنگلی در طی زمان رخ می‌دهد. بررسی تحول ساختار توده بر اساس مراحل تحولی انجام می‌شود که عبارتند از جوانی، اوج و تخریب. هدف از این پژوهش، ارزیابی قابلیت شاخص‌های غیرمکانی ساختار برای تفکیک مراحل تحولی توده راش- ممرز در سری یک طرح جنگل‌داری حاجی‌کلا- تیرانکلی ساری بود. سه قطعه‌نمونه یک هکتاری به روش انتخابی در سه مرحله‌ تحولی و در مجموع نه قطعه‌نمونه انتخاب شدند. در تمام قطعه‌نمونه‌ها با استفاده از آماربرداری صددرصد، مشخصات نوع گونه، قطر برابر سینه و ارتفاع کل  درختان با قطر برابر سینه مساوی و بیشتر از 7 /5سانتی‌متر اندازه‌گیری و ثبت ‌شد. بر اساس نتایج به‌دست آمده ازتجزیه واریانس، شاخص‌های رویه زمینی، حجم سرپای توده، تراکم، تراکم درختان قطورتر از 72 /5سانتی‌متر، انحراف معیار قطر و ارتفاع درختان توده، قطر و ارتفاع درختان آشکوب بالا، شاخص سطح برگ، شدت نور نسبی، نسبت رویه زمینی درختان خیلی قطور به قطور و شاخص تغییریافته Frelich-Lorimer ، در بین مراحل تحولی اختلاف معنی‌داری داشتند. شاخص‌های قطر برابر سینه، تراکم درختان قطورتر از 100 سانتی‌متر، قطر خشک‌دار، تعداد خشک‌دار، ضریب جینی، دولیوکورت، پیچیدگی ساختاری، غنای گونه‌های آشکوب بالا و  کاکس، مراحل تحولی را از یکدیگر تفکیک نکردند. با استفاده از مثلث ساختار و شاخص Frelich-Lorimer به‌خوبی مرحله تحولی توده تعیین شد.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of developmental stages in Beech-Hornbeam stands using non-spatial indices of stand structure

نویسندگان [English]

  • Roja Amini 1
  • Ramin Rahmani 2
  • Pejman Parhizkar 3
1 Ph.D. Student of Silviculture and Forest Ecology, Faculty of Forest Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2 Associate Prof., Department of Silviculture and Forest Ecology, Faculty of Forest Science, Grogan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
3 Assistant Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
چکیده [English]

Forest stand structural development occurs over time and is commonly studied based on initial, optimal and decay developmental stages. The purpose of this study was to evaluate the capability of non-spatial indices for differentiating among developmental stages of beech-hornbeam stand in Haji-Kola- Tirankoli forest of Sari in Mazandaran province. Three sample plots were selected in each developmental stage (totally 9 sample plots). The characteristics of trees with a diameter > 7.5 cm were measured in each plot, including species, diameter at breast height and total height. The results of analysis of variance revealed significant differences amongst the developmental stages for basal area, volume, density, density of large trees, standard deviation of diameter and height, diameter and height of overstory, leaf area index, relative light intensity, species richness of over story, basal area of large to mature trees, modified Frelich-Lorimer index. Nevertheless, other attributes including DBH, density of trees > 100 cm, deadwood diameter, and number of dead wood, Gini coefficient, Doliucort index, Structural Complexity index, and Cox index did not differentiate among the developmental stages. The structure triangle and the Frelich-Lorimer index were shown to properly determine the stage of stand development.

کلیدواژه‌ها [English]

  • Developmental indices
  • Frelich-Lorimer index
  • Mazandaran
  • structure development
  • structure triangle

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