Bončina, Ziva; Trifković, Vasilije; Rosset, Christian; Klopčič, Matija (2022). Evaluation of estimation methods for fitting the three-parameter Weibull distribution to European beech forests iForest : Biogeosciences and Forestry, 15(6), pp. 484-490. Italian Society of Silviculture and Forest Ecology 10.3832/ifor4145-015
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We evaluated three estimation methods for fitting the three-parameter Weibull distribution to even-aged European beech (Fagus sylvatica) forests by using experimental tree diameter data collected in 3709 sample plots (500 m2 each). The maximum likelihood estimation method (MLE), the method of moments (MOM) and the method of modified moments type 1 (MM1) were applied for fitting the Weibull function. The goodness-of-fit of stand parameters (total tree number, stand basal area, dominant stand diameter and mean quadratic diameter) was tested by MAE and RMSE, and the probability and cumulative density functions of trees per 5 cm diameter classes were additionally tested by the Kolmogorov-Smirnov test and compared with Kolmogorov-Smirnov’s D statistic. All three methods are suitable for estimating stand parameters based on the fitted Weibull function. Fitting the diameter distribution per 5 cm diameter classes at the plot level was less accurate due to the low number of trees or irregular diameter distribution of trees. The MM1 method was found to be the most suitable for fitting the three-parameter Weibull distribution to beech forests represented by data derived from small plots.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
School of Agricultural, Forest and Food Sciences HAFL School of Agricultural, Forest and Food Sciences HAFL > Multifunctional Forest Management > Forest Ecosystem and Management |
Name: |
Bončina, Ziva; Trifković, Vasilije; Rosset, Christian  0009-0001-6284-5135 and Klopčič, Matija |
Subjects: |
S Agriculture > SD Forestry |
ISSN: |
1971-7458 |
Publisher: |
Italian Society of Silviculture and Forest Ecology |
Language: |
English |
Submitter: |
Christian Rosset |
Date Deposited: |
27 Jul 2023 16:07 |
Last Modified: |
08 Aug 2023 15:29 |
Publisher DOI: |
10.3832/ifor4145-015 |
Uncontrolled Keywords: |
Diameter Distribution Fitting, Weibull Function, Parameter Estimation, Inventory Data, Circular Sample Plots, Near-natural Forests, Fagus Sylvatica, Slovenia |
ARBOR DOI: |
10.24451/arbor.19681 |
URI: |
https://arbor.bfh.ch/id/eprint/19681 |
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