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Browsing Articles by Subject "Data, Stem Profile, and Taper Equations."

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    DEVELOPING STEM TAPER EQUATION FOR TECTONA GRANDIS (TEAK) PLANTATION IN AGUDU FOREST RESERVE, NASARAWA STATE, NIGERIA.
    (Department of Forestry, Nasarawa State University Keffi., 2015-09-26) Shuaibu, Rabi Binta.
    Stem taper equations were developed for Teclona grandis Iteak) plantalionjn Ztrrr:::zz^ purposely selected to ensure coverage of a full range of tree sices. Four ^0, stent requaum« compared for bias and precision using regression techniques. The data const f • ., .■ . ranted from 11.6 to along the stem; and total height of individual tree. The dbh ranged from -J* .0 to ■ cm, art of each model to predict a 20.6m. SPSS was used to generate the equations. Various criteria were use, 1J°f'™™j20+0.869(Df+0.081(liM)-O.H9(liV/H); specified dependent variable. The four taper equations generated \ ■ o~-n oqa d:=0.162+0.S01(D:)+ 0.069(h/H-1)+0.090(lr/H:-l); lnd=0.156-0.926ln(D)+0.453-h\-0.23J;\nand -n were 0.928 In (D2)+1.183\nCj:-l)-0.597]nC-1). The correlation coefficients of the four models developed 0.97. 0.95. 0.98 and 0.98 respectively, while the coefficients of determination (R-) were 947c. 91% 967c and 967c respectively The F-ratio was significant (p<0.05) with small SEE (0.01. 0.01. 0.02 and 0.05 for the models, respectively). The equation developed was fitted to the data, and the resulting equations possessed desirable statistical properties and model behaviors. Therefoie, aei*. opui0 tnese equations for effective and sustainable management of Teak stands is imperative.