Goodness-of-Fit Test for Volume Equations of Three Timber Species in South East Cameroon
Goodness-of-Fit Test for Volume Equations of Three Timber Species in South East Cameroon作者机构：Department of Forestry Faculty of Agronomy & Agricultural Sciences University of Dschang Dschang 222 Cameroon Department of Crop Production Soil & Environmental Management BOWEN University lwo Osun Osun State Nigeria Department of Agricultural Economics Osun State University Osogbo Osun Osun State Nigeria
出 版 物：《Journal of Environmental Science and Engineering(B)》 (环境科学与工程（B）)
年 卷 期：2012年第1卷第5期
页 面：600-605页
学科分类：0710[理学-生物学] 090701[农学-林木遗传育种] 0907[农学-林学] 07[理学] 08[工学] 0829[工学-林业工程] 09[农学] 071007[理学-遗传学]
主 题：Volume equations misapplication timber species Cameroon.
摘 要：A study on the validity of volume equations currently used for three timber species, Entandrophragma cylindricum, Erythrophleum ivorensis and Pericopsis elata （Sapelli, Tali and Assamela respectively） in south east Cameroon, was conducted between the months of July and September, 2007 to evaluate their suitability for the site. Twenty-two percent sampling intensity was conducted within annual allowable cuts and diameter readings taken on standing trees with the aid of a wide band Relascope. A non linear regression equation model was employed to compute volume equations and the student＇s t-test for the analysis of the existing models. Based on individual tree volumes within stands, new equations for the three species were constructed. A comparison was made between the new equations and those that were being used at the site. Results indicated a total standing volume of 0.007 m3/ha obtained for the three species （Sapelli 0.003 m3/ha, Tali 0.002 m3/ha and Assamela 0.002 m3/ha）. Two new volume equation models [B] and [C] were retained for their goodness-of-fit with [B] for Assamela and [C] for Sapelli and Tali. Results also showed that a total volume of 0.005 m3/ha was underestimated for the three species （Sapelli 0.002 m3/ha, Tali 0.001 m3/ha and Assamela 0.002 m3/ha） when existing volume equations were applied. It is imperative to construct new volume equations that are compatible with the ecological characteristics of the site using representative samples. Setting-up appropriate methods for their validation shall also serve as checks to future management errors.
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