Model validation for stand timber volume in plantation forests using the airborne LiDAR open data of Shizuoka Prefecture

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<p>Knowing the stand timber volume in a forest is necessary for good forest management. A typical way to work out stand timber volume is to use the area-based approach (ABA) with airborne LiDAR. The ABA requires checking the model applicability and parameters against other forest areas. The present study developed a stand timber volume estimation based on publicly available data on the Internet. The objectives of the present study were 1) to evaluate errors in stand timber volume using the ABA and 2) to examine the factors affecting these errors. The study area was located in the eastern part of Shizuoka Prefecture, with 15 plots in Cryptomeria japonica-dominated forests and 13 plots in Chamaecyparis obtusa-dominated forests. Errors in stand timber volume were evaluated by comparing the airborne LiDAR results with results of conventional methods. Relative root-mean-square error (RMSE) and bias were 20% and –14% for the coniferous forest parameter and 17% and –11% for the mixed forest parameter, respectively, resulting in underestimations. The multiple regression analysis showed that the determination coefficient (R2) was 0.66, the relative error was underestimated as the total basal area increased, and the relative error was underestimated more for C. japonica than for C. obtusa. The errors in the present study were relatively small compared to seven previous studies. Therefore, the present study showed that estimating the stand timber volume by using the ABA was valid in the eastern part of Shizuoka Prefecture.</p>

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  • Eco-Engineering

    Eco-Engineering 35 (1), 25-32, 2023-01-31

    生態工学会

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