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Research Article | Open Access

Prediction of tree crown width in natural mixed forests using deep learning algorithm

Yangping Qina,b, Biyun Wua, Xiangdong Leia( ), Linyan Fenga
Key Laboratory of Forest Management and Growth Modelling, National Forestry and Grassland Administration, Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Beijing, 100091, China
Southwest Survey and Planning Institute, National Forestry and Grassland Administration, Kunming, 650031, China
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Abstract

Crown width (CW) is one of the most important tree metrics, but obtaining CW data is laborious and time-consuming, particularly in natural forests. The Deep Learning (DL) algorithm has been proposed as an alternative to traditional regression, but its performance in predicting CW in natural mixed forests is unclear. The aims of this study were to develop DL models for predicting tree CW of natural spruce-fir-broadleaf mixed forests in north-eastern China, to analyse the contribution of tree size, tree species, site quality, stand structure, and competition to tree CW prediction, and to compare DL models with nonlinear mixed effects (NLME) models for their reliability. An amount of total 10, 086 individual trees in 192 subplots were employed in this study. The results indicated that all deep neural network (DNN) models were free of overfitting and statistically stable within 10-fold cross-validation, and the best DNN model could explain 69% of the CW variation with no significant heteroskedasticity. In addition to diameter at breast height, stand structure, tree species, and competition showed significant effects on CW. The NLME model (R2 ​= ​0.63) outperformed the DNN model (R2 ​= ​0.54) in predicting CW when the six input variables were consistent, but the results were the opposite when the DNN model (R2 ​= ​0.69) included all 22 input variables. These results demonstrated the great potential of DL in tree CW prediction.

Keywords

CompetitionDeep neural networksStand structureMixed forestsCrown width

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Forest Ecosystems
Volume 10 Issue 3,
June 2023
Article number: 100109
DOI: 10.1016/j.fecs.2023.100109
Cite this article:
Qin Y, Wu B, Lei X, et al. Prediction of tree crown width in natural mixed forests using deep learning algorithm. Forest Ecosystems, 2023, 10(3): 100109. https://doi.org/10.1016/j.fecs.2023.100109

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Received: 12 February 2023
Revised: 29 March 2023
Accepted: 30 March 2023
Published: 06 April 2023
© 2023 The Authors.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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