ارزیابی توان رویش ارتفاعی توده‌های صنوبر دلتوئیدس (Populus deltoides Marsh.) با استفاده از مدل جمعی تعمیم‌یافته (مطالعه موردی: صنوبرکاری‌های سنواتی منطقه گیسوم و هفت‌دغنان)

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشجوی دکتری جنگل‌داری، دانشکده منابع طبیعی، دانشگاه گیلان

2 دانشیار، گروه جنگل‌داری، دانشکده منابع طبیعی، دانشگاه گیلان

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

4 استاد، گروه جنگل‌داری، دانشکده منابع طبیعی، دانشگاه گیلان

5 دانشیار، گروه خاکشناسی، دانشکده کشاورزی، دانشگاه گیلان

چکیده

توان تولید یکی از شاخص‌های کلیدی خدمات اکوسیستم جنگل است و معیاری مهم برای پیش‌بینی میزان تولید، بهره‌برداری مجاز سالانه و همچنین میزان رویش رویشگاه است. در پژوهش پیش‌رو از معیار ارتفاع غالب که معیار مطمئنی برای ارزیابی کیفیت توده است، استفاده شد. برای این منظور در توده‌های صنوبر دلتوئیدس (Populus deltoides Marsh.) به روش انتخابی 52 قطعه‌نمونه مربعی به مساحت 400 متر مربع پیاده شد و در هریک ارتفاع و قطر درختان صنوبر و ارتفاع از سطح دریا ثبت شد. همچنین از عمق صفر تا 20 و 20 تا 40 سانتی‌متری، نمونه خاک برداشت شد و متغیرهای مورد نظر اندازه‌گیری شدند. ارزیابی توان تولید توده‌های صنوبر با استفاده از مدل جمعی تعمیم‌یافته و معیار اطلاعاتی آکائیک در بسته GRASP در نرم‌افزار آماری R نشان داد که ارتفاع از سطح دریا و متغیرهای فسفر، درصد رطوبت اشباع، کربن آلی، درصد سنگریزه و نیتروژن در عمق 20 تا 40 سانتی‌متری و همچنین کلسیم، جرم مخصوص ظاهری خاک و pH در عمق صفر تا 20 سانتی‌متری، بیشتر از 90 درصد تغییرات توان تولید را توجیه می‌کنند. به‌کارگیری معیار اهمیت نسبی نشان داد که ارتفاع از سطح دریا، فسفر در عمق 20 تا 40 سانتی‌متری و جرم مخصوص ظاهری خاک در عمق صفر تا 20 سانتی‌متری، به‌طور انفرادی و ارتفاع از سطح دریا، کربن آلی در عمق 20 تا 40 سانتی‌متری و جرم مخصوص ظاهری خاک در عمق صفر تا 20 سانتی‌متری، در ترکیب با بقیه متغیرها مهم‌ترین عامل‌ها در تغییرات توان تولید توده صنوبر بوده‌اند.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of poplar (Populus deltoids Marsh.) stands height growth using a Generalized Additive Model (Case study: Guisoum & Haft-Daghanan region, Guilan province)

نویسندگان [English]

  • Somayyeh Solgi 1
  • Ali Salehi 2
  • Seyyed Jalil Alavi 3
  • Hasan Pourbabaei 4
  • Mahmoud Shabanpour 5
1 Ph.D. Student Forestry, Department of Forestry, Faculty of Natural Resources, University of Guilan
2 Associate Prof., Department of Forestry, Faculty of Natural Resources, University of Guilan
3 Assistant Prof., Department of Forestry, Faculty of Natural Resources and Marine Sciences, University of Tarbiat Modares
4 Prof., Department of Forestry, Faculty of Natural Resources, University of Guilan
5 Associate Prof., Department of Soil Sciences, Faculty of Agriculture, University of Guilan
چکیده [English]

Site productivity is a key indicator of forest ecosystem, and is therefore an important criterion for forest managers to estimate the yield, annual exploitation and site growth. In this study, dominant height index was used as the most reliable criterion for evaluating site productivity of even-aged stands. A selective sampling method was used to locate 52 square sample plots of 0.04 ha each in poplar stands. The height and diameter of Populus deltoides Marsh. trees and altitude of each plot was recorded. Also, in each plot, soil samples from 0-20 cm and 20-40 cm depths were taken for analyzing several soil properties. Evaluation of stands productivity by using generalized additive models and AIC showed that  altitude, P, saturation, organic carbon , gravel, N from 20-40 cm depth as well as Ca, bulk density and pH from depth 0-20 cm were the significant variables explaining the 90% of variability in productivity of P. deltoides. Using the relative importance criterion showed that altitude, P from 20-40 cm depth and bulk density from 0-20 cm depth were associated with dominant roles, yet the overall contribution of altitude, organic carbon from 20-40 cm depth, bulk density from 0-20 cm depth, together with other variables, were the most significant drivers of poplar site productivity.

کلیدواژه‌ها [English]

  • Dominant height
  • relative importance
  • site productivity
  • soil chemical and physical properties
  • Generalized Additive Model

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