اندازه‌گیری و مدل‌سازی وزن لاشریزه و شاخص سطح برگ به‌روش آلومتری در یک جنگل راش- ممرز، ارتفاع میان‌بند جنگل‌های هیرکانی، ایران

نوع مقاله : علمی- پژوهشی

نویسندگان

1 هیات علمی دانشگاه گرگان

2 کارشناس ارشد جنگلداری، دانشگاه گرگان

چکیده

وزن لاشریزه و شاخص سطح برگ در فرایندهای زیستی مؤثر بر تولید جنگل شامل فتوسنتز، چرخه آب و عناصر غذایی نقش بسزایی دارند. در این پژوهش وزن لاشریزه یک توده راش- ممرز واقع در ارتفاع میان‌بند منطقه هیرکانی (طرح جنگلداری نکا- ظالمرود، بخش پنج) با استفاده از 27 جمع‌آوری‌کننده لاشریزه به‌مدت یکسال اندازه‌گیری شد. همچنین شاخص سطح برگ با روش وزنی و به‌وسیله دستگاه سطح‌برگ‌سنج و نیز لوله برش به‌دست آمد. بااستفاده از مشخصه‌های آلومتریک شامل تراکم، رویه زمینی، حجم تنه، مساحت و حجم تاج، برای برآورد وزن لاشریزه و شاخص سطح برگ، مدل رگرسیون ارائه شد. وزن کل لاشریزه 5/472 و وزن لاشبرگ 3/707 تن در هکتار در سال به‌دست آمد. میانگین شاخص سطح برگ با دستگاه سطح‌برگ‌سنج 7/5 و با لوله برش 7/7 به‌دست آمد. نتایج حاکی از آن است که مساحت و حجم تاج به‌دلیل داشتن ضریب تعیین بزرگ‌تر و خطای کوچک‌تر، برای برآورد وزن لاشریزه و شاخص سطح برگ نسبت به سایر مشخصه‌های آلومتریک مناسب‌تر هستند. مدل‌های توده راش- ممرز نسبت به مدل‌های گونه راش و ممرز از خطای کمتری برخوردار بودند و دقت مدل‌های گونه ممرز خیلی کمتر از راش بود.

کلیدواژه‌ها

عنوان مقاله [English]

Measurement and modelling litter biomass and leaf area index using allometry in a Beech-Hornbeam stand in the mid-elevation of the Hyrcanian region, Iran

نویسندگان [English]

  • Ramin Rahmani 1
  • Somayyeh Ghorbani 2
  • Masoumeh Naghash Zargaran 2
1 Associate Professor, Department of Silviculture and Forest Ecology, Faculty of Forest Sciences, ‎Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, I.R. Iran.‎
2 M.Sc. of forestry, Department of Silviculture and Forest Ecology, Faculty of Forest Sciences, Gorgan University of ‎Agricultural Sciences and Natural Resources, Gorgan, I.R. Iran.‎
چکیده [English]

Litter biomass and leaf area index (LAI) are two important attributes which play crucial roles on the biological processes which impact forest productivity, including photosynthesis, water and nutrient cycles. Litter biomass of a Beech-Hornbeam stand located at the mid-elevation of the Hyrcanian region (Forest management plan of Neka-Zalemroud, district five) was measured using 27 litter traps in a one-year period. In addition, LAI was determined by means of gravimetric method, applying a leaf area meter as well as a metal pipe cutter. A regression model was parameterized to predict the values of litter biomass and LAI using a set of allometric parameters including density, basal surface area, trunk volume, and crown area / volume. Total litter biomass and leaf biomass were determined to be 5.472 and 3.707 ton per hectare per year, respectively. Mean LAI was measured to be 7.5, and 7.7 using leaf area meter, and metal pipe cutter, respectively. The analysis shows that area and volume of crown presents a greater coefficient of determination and smaller root mean squared error than other allometric parameters, indicating the best predictors regarding litter biomass and LAI. Stand-specific models of Beech-Hornbeam were detected more robust than species-specific models of Beech and Hornbeam. Furthermore, species-specific models of Hornbeam were significantly less robust than those specified for Beech.

کلیدواژه‌ها [English]

  • Allometric parameters
  • crown cover
  • Gravimetric method
  • Specific leaf area
  • leaf litter
  • Dry weight

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