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Compatible taper and stem volume equations for Larix kaempferi(Japanese larch) species of South Korea 被引量:6
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作者 nova d.doyog Young Jin LEE +2 位作者 Sun Joo LEE Jin Taek KANG Sung Yong KIM 《Journal of Mountain Science》 SCIE CSCD 2017年第7期1341-1349,共9页
In this study, compatible taper and stem volume equations were developed for Larix kaempferi species of South Korea. The dataset was split into two groups: 80% of the data were used in model fitting and the remaining... In this study, compatible taper and stem volume equations were developed for Larix kaempferi species of South Korea. The dataset was split into two groups: 80% of the data were used in model fitting and the remaining 2o% were used for validation. The compatible MB76 equations were used to predict the diameter outside bark to a specific height, the height to a specific diameter and the stem volume of the species. The result of the stem volume analysis was compared with the existing stem volume model of Larix kaempferi species of South Korea which was developed by the Korea Forest Research Institute and with a simple volume model that was developed with fitting dataset in this study. The compatible model provided accurate prediction of the total stem volume when compared to the existing stem volume model and with a simple volume model. It is concluded that the compatible taper and stem volume equations are more convenient to use and therefore it is recommended to be applied in the Larix kaempferi species of South Korea. 展开更多
关键词 Larix kaempferi Taper volume equation Tree stem volume equation Compatible volume Segmented model Merchantable volume estimation
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Fitting and evaluation of height-diameter models for Alnus japonica in La Trinidad, Benguet, Philippines 被引量:1
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作者 Kamae P.ANACIOCO Judy Ann L.GORIO +3 位作者 Mary Relia S.PADSICO Roscinto Ian C.LUMBRES nova d.doyog Young Jin LEE 《Journal of Mountain Science》 SCIE CSCD 2018年第11期2422-2432,共11页
The study was conducted to develop height-diameter at breast height(HT-DBH) models for Alnus japonica in La Trinidad, Benguet,Philippines and evaluate their predictive capability.The six widely used nonlinear growth m... The study was conducted to develop height-diameter at breast height(HT-DBH) models for Alnus japonica in La Trinidad, Benguet,Philippines and evaluate their predictive capability.The six widely used nonlinear growth models that were selected in this study were the ChapmanRichards, Schnute, Modified logistic, Korf/Lundqvist,Weibull and Exponential. A total of 208 Alnus japonica trees were measured using standard diameter tape for DBH(1.3 m above the ground) and Vertex and transponder was used for the total height measurement. The performance of the developed models were evaluated using the fit statistics including coefficient of determination(R^2), root mean square error(RMSE), mean bias(ē), absolute mean difference(AMD), and Akaike Information Criterion(AIC). The lack-of-fit statistics was also performed for further evaluation of the performance of the models.Based on the evaluation criteria, all six models were able to determine the DBH-height relationships and fitted the data well. Using the rank analysis, the Weibull HT-DBH model had the best performance among the six commonly used nonlinear growth models. The results of this study will help forest managers especially in La Trinidad, Benguet to easily predict the total height using the Weibull model for Alnus japonica utilizing the DBH as the predicting variable. 展开更多
关键词 Height- DBH model Alnus japonica Rank analysis La Trinidad Benguet Philippines
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