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LOCAL GROWTH MODEL IN MODELLING THE CROWN DIAMETER OF PLANTATION-GROWN DRYOBALANOPS AROMATICA

Y Ahmad Zuhaidi
Journal of Tropical Forest Science
Vol. 21, No. 1 (January 2009), pp. 66-71
Stable URL: http://www.jstor.org/stable/23616563
Page Count: 6
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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.
LOCAL GROWTH MODEL IN MODELLING THE CROWN DIAMETER OF PLANTATION-GROWN DRYOBALANOPS AROMATICA
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Abstract

The importance of crown data in improving the construction of growth models for stand management has long been established for many temperate and a few tropical species. Growth models will assist in determining the allometric relationship between crown and tree diameter, optimum planting distance and expected final crop tree density. This study examined the allometric relationship of plantation-grown Dryobalanops aromatica by regression of curvilinear models between projected crown and measured tree diameter at breast height (dbh). The study was carried out in 2005 at Bukit Lagong Forest Reserve, Selangor, Peninsular Malaysia. Results indicate that model as a function of dbh and dbh2 explained a significant proportion of the variation in the crown diameter at 62.9%. The model possessed a standard error of estimate at 1.197. Overall results of the modelling were negatively biased and underestimated (0.266 m) the predicted crown diameter of the species. The information provided by this study could serve as a guide in formulating a standard growth model, realistic production targets, planting density and limiting stocking in future plantations of the species. Kepentingan data silara untuk tujuan menambah baik pembuatan model pertumbuhan untuk pengurusan dirian ladang telah lama digunakan bagi kebanyakan spesies iklim sederhana dan beberapa spesies tropika. Pembinaan model pertumbuhan boleh membantu dalam menentukan hubung kait alometri antara silara dengan diameter pokok, jarak tanaman yang optimum dan jangkaan ketumpatan dirian akhir. Manuskrip ini meneliti hubung kait alometri spesies kapur (Dryobalanops aromatica) yang ditanam secara perladangan menggunakan regresi model melengkung antara anggaran silara dan diameter pokok yang diukur pada aras 1.3 m. Kajian ini dijalankan pada tahun 2005 di Hutan Simpan Bukit Lagong, Selangor, Semenanjung Malaysia. Keputusan kajian menunjukkan model yang berfungsikan diameter dan diameter kuasa dua berjaya menerangkan dengan signifikan variasi diameter silara pada kadar 62.9%. Model ini mempunyai ralat piawai pada kadar 1.197. Keputusan keseluruhan kajian unjuran adalah bias negatif dan kurang anggaran (0.266 m) ramalan diameter silara spesies. Maklumat yang didapati daripada kajian ini dapat digunakan sebagai garis panduan dalam mereka bentuk model pertumbuhan yang standard, sasaran pengeluaran yang realistik, ketumpatan dirian dan populasi ladang pada masa hadapan.

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