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A POLYNOMIAL TAPER CURVE FUNCTION FOR ZAMBIAN EXOTIC TREE PLANTATIONS

J. Heinonen, J. Saramäki and P.M. Sekeli
Journal of Tropical Forest Science
Vol. 8, No. 3 (March 1996), pp. 339-354
Stable URL: http://www.jstor.org/stable/43582054
Page Count: 16
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A POLYNOMIAL TAPER CURVE FUNCTION FOR ZAMBIAN EXOTIC TREE PLANTATIONS
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Abstract

Defining tree taper gives advantages in deriving the utilisable portions of trees. A high degree polynomial is used to estimate average relative taper. Some of the parameters of the polynomial should be functions of diameter at breast height and total height of the tree, and the remaining parameters can be held constant within a tree species. The study describes a somewhat simplified version of the polynomial taper curve model developed by Laasasenaho and presents a simple method for transforming the overbark taper curve models to underbark ones. Taper curve functions for the main exotic tree species Pinus kesiya, Pinus oocarpa, Pinus merkusii, Pinus michoacana, Eucalyptus grandis and Eucalyptus cloeziana in Zambia are derived. The polynomial appears to fit equally well with differently tapering tree species and gives good estimates for both over-and underbark diameters. Regression functions for bark thickness are also given. Menentukan keluk pokok memberikan kelebihan untuk mendapatkan bahagian-bahagian pokok yang dapat digunakan. Polinomial yang tinggi darjahnya digunakan untuk menganggarkan purata keluk yang berkaitan. Beberapa parameter bagi polinomial tersebut sepatutnya berfungsi sebagai diameter aras dada dan jumlah ketinggian pokok, dan parameter-parameter yang lain boleh dijadikan konstan di dalam sesuatu spesies pokok. Kajian ini menerangkan mengenai versi keluk tirus polinomial yang dipermudahkan yang dicipta oleh Laasasenoho dan menghasilkan satu kaedah yang mudah untuk memindahkan model keluk tirus atas kulit kepada model bawah kulit. Fungsi keluk tirus bagi spesies pokok dagang utama Pinus kesiya, Pinus oocarpa, Pints merkusii, Pinus michoacana, Eucalyptus grandis dan Eucalyptus cloeziana di Zambia telah diperolehi. Polinomial didapati amat sesuai dengan spesies pokok tirus yang berbeza dan memberikan anggaran yang baik bagi diameter atas kulit dan bawah kulit. Fungsi-fungsi regresi untuk ketebalan kulit pokok juga diberikan.

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