Characterising the diameter distribution of Sal plantations by comparing normal, lognormal and Weibull distributions at Tilagarh Eco-park, Bangladesh

Jiban Chandra Deb*, Md Habibur Rahman Salman, Md Abdul Halim, Md Qumruzzaman Chowdhury, Anindita Roy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

For many years foresters have been using statistical probability density functions to describe and characterise stand structure. Predicting the current and future yields of a stand is essential for successful stand and timber management. Implicit prediction of current yield is accomplished by using diameter distribution methods. All diameter distribution yield systems predict the number of trees per unit area by diameter class. In this study, the normal, lognormal and the three-parameter Weibull probability density function were compared to characterise the diameter distributions of Sal (Shorea robusta) plantations grown at Tilagarh Eco-park, Bangladesh. Data from 70 plots, established in three plantations, were used for this study. The Weibull parameters were estimated by the maximum likelihood and moments estimator methods. A one-sample Kolmogorov–Smirnov test was used for the goodness of fit for all models. The Kolmogorov–Smirnov test results showed that both lognormal and Weibull distributions were suitable to characterise the diameter distributions of Sal plantations in the study area and may be applicable for other Sal forests in Bangladesh.

Original languageEnglish
Pages (from-to)201-208
Number of pages8
JournalSouthern Forests
Volume76
Issue number4
DOIs
Publication statusPublished - 31 Oct 2014
Externally publishedYes

Keywords

  • Bangladesh
  • diameter
  • lognormal distribution
  • Sal plantations
  • Tilagarh Eco-park
  • Weibull distribution

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