Simplified the tree crown model using mensuration data

Chang, See Yeong (2008) Simplified the tree crown model using mensuration data. School of Science Technology. (Unpublished)


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The crown profile equation was developed based on data measured from 55 Cinnamomum iners trees which randomly sampled in the Universiti Malaysia Sabah. At the same time, a simple model for crown shape was also derived using the equation that was introduced by Rautiainen in 2005 based on these data The parameters that were needed to estimate the crown profile were diameter at breast height (DSH), tree height (HT), crown ratio (CR) and crown length (CL). The correlation matrix was used to identify the relationship between the dependent variable and each of these independent variables. Since the sample size n≥50, the Kolmogrov- Smirnov test was used to test the normality of the data to ensure that the data were always normal. Then the best crown width model can be obtained by using multiple regressions based on the 8 model selection criteria (8SC). After that, the Global test and regression coefficients test were used to ensure that the best model obtained will give the optimum crown shape. The Wald test, however, was not used since the null hypothesis for best model only has one regression coefficient. The results showed that the C. iners crown shape was elliptic and the diameter breast height (DBH), crown ratio (CR), crown length (CL), and tree height (HT) will affect the largest crown width of C. iners trees.

Item Type: Academic Exercise
Uncontrolled Keywords: Cinnamomum iners tree, crown shape, breast height, crown ratio, crown length, Kolmogrov-Smirnov test, elliptic
Subjects: Q Science > QA Mathematics
Divisions: SCHOOL > School of Science and Technology
Date Deposited: 09 Jan 2014 06:00
Last Modified: 10 Oct 2017 07:55

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