Abstract
This study was conducted to develop and validate the height-diameter at breast height (DBH) models for the three Pinus and one Larix species in South Korea using the six widely used nonlinear growth functions. The data collected from the 5th National Forest Inventory (NFI) of South Korea from the 2007 to 2008 measurement dataset were used in this study. A total of 11,693 total height and diameter measurements of the trees were used and split into two datasets. Of the dataset 80% was used for the initial parameters estimation of the six models, whereas the remaining 20% were applied to the model validation. On the other hand, the combined dataset (100%) was used for the final model fitting. The performance of the developed models was evaluated and ranked using the coefficient of determination (R2), root mean square error (RMSE), mean difference (MD) and absolute mean difference (AMD). The results showed that the R2 of all six models for the four species ranged from 0.93 to 0.96. The lowest RMSE was 2.351 whereas the highest was 3.309. On the other hand, the overall MD ranged from -0.006 m to 0.044 m whereas the AMD ranged from 1.855 m to 2.626 m. Based on these four criteria, all six models were able to determine the height-DBH relationship and fitted the data well. The Modified Logistic and Korf/Lundqvist performed best compared with the other models using rank analysis. The equations developed for predicting the total height were used for the biomass estimation. With the exception of the Schnute model, all models provided similar results for all species, particularly for trees with less than 50 cm.
| Original language | English |
|---|---|
| Pages (from-to) | 117-125 |
| Number of pages | 9 |
| Journal | Forest Science and Technology |
| Volume | 7 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2011 Sep 1 |
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Keywords
- height-DBH models
- National Forest Inventory
- nonlinear growth functions
ASJC Scopus subject areas
- Forestry
- Management, Monitoring, Policy and Law
Cite this
Development and validation of nonlinear height-DBH models for major coniferous tree species in Korea. / Lumbres, Roscinto Ian C; Lee, Young Jin; Seo, Yeon Ok; Kim, Sung Ho; Choi, Jung Kee; Lee, Woo-Kyun.
In: Forest Science and Technology, Vol. 7, No. 3, 01.09.2011, p. 117-125.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Development and validation of nonlinear height-DBH models for major coniferous tree species in Korea
AU - Lumbres, Roscinto Ian C
AU - Lee, Young Jin
AU - Seo, Yeon Ok
AU - Kim, Sung Ho
AU - Choi, Jung Kee
AU - Lee, Woo-Kyun
PY - 2011/9/1
Y1 - 2011/9/1
N2 - This study was conducted to develop and validate the height-diameter at breast height (DBH) models for the three Pinus and one Larix species in South Korea using the six widely used nonlinear growth functions. The data collected from the 5th National Forest Inventory (NFI) of South Korea from the 2007 to 2008 measurement dataset were used in this study. A total of 11,693 total height and diameter measurements of the trees were used and split into two datasets. Of the dataset 80% was used for the initial parameters estimation of the six models, whereas the remaining 20% were applied to the model validation. On the other hand, the combined dataset (100%) was used for the final model fitting. The performance of the developed models was evaluated and ranked using the coefficient of determination (R2), root mean square error (RMSE), mean difference (MD) and absolute mean difference (AMD). The results showed that the R2 of all six models for the four species ranged from 0.93 to 0.96. The lowest RMSE was 2.351 whereas the highest was 3.309. On the other hand, the overall MD ranged from -0.006 m to 0.044 m whereas the AMD ranged from 1.855 m to 2.626 m. Based on these four criteria, all six models were able to determine the height-DBH relationship and fitted the data well. The Modified Logistic and Korf/Lundqvist performed best compared with the other models using rank analysis. The equations developed for predicting the total height were used for the biomass estimation. With the exception of the Schnute model, all models provided similar results for all species, particularly for trees with less than 50 cm.
AB - This study was conducted to develop and validate the height-diameter at breast height (DBH) models for the three Pinus and one Larix species in South Korea using the six widely used nonlinear growth functions. The data collected from the 5th National Forest Inventory (NFI) of South Korea from the 2007 to 2008 measurement dataset were used in this study. A total of 11,693 total height and diameter measurements of the trees were used and split into two datasets. Of the dataset 80% was used for the initial parameters estimation of the six models, whereas the remaining 20% were applied to the model validation. On the other hand, the combined dataset (100%) was used for the final model fitting. The performance of the developed models was evaluated and ranked using the coefficient of determination (R2), root mean square error (RMSE), mean difference (MD) and absolute mean difference (AMD). The results showed that the R2 of all six models for the four species ranged from 0.93 to 0.96. The lowest RMSE was 2.351 whereas the highest was 3.309. On the other hand, the overall MD ranged from -0.006 m to 0.044 m whereas the AMD ranged from 1.855 m to 2.626 m. Based on these four criteria, all six models were able to determine the height-DBH relationship and fitted the data well. The Modified Logistic and Korf/Lundqvist performed best compared with the other models using rank analysis. The equations developed for predicting the total height were used for the biomass estimation. With the exception of the Schnute model, all models provided similar results for all species, particularly for trees with less than 50 cm.
KW - height-DBH models
KW - National Forest Inventory
KW - nonlinear growth functions
UR - http://www.scopus.com/inward/record.url?scp=84872561224&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84872561224&partnerID=8YFLogxK
U2 - 10.1080/21580103.2011.594610
DO - 10.1080/21580103.2011.594610
M3 - Article
AN - SCOPUS:84872561224
VL - 7
SP - 117
EP - 125
JO - Forest Science and Technology
JF - Forest Science and Technology
SN - 2158-0103
IS - 3
ER -