文献类型：期刊文献

英文题名：Deciphering nitrogen concentrations in Metasequoia glyptostroboides: a novel approach using RGB images and machine learning

作者：Ma, Cong[1,2] Tong, Ran[1] Zhu, Nianfu[1] Yuan, Wenwen[1] Li, Yanji[1] Wang, G. Geoff[3] Wu, Tonggui[1]

第一作者：Ma, Cong

通信作者：Wu, TG[1]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, East China Coastal Forest Ecosyst Long Term Res St, Hangzhou 311400, Peoples R China;[2]Nanjing Forestry Univ, Nanjing 210037, Peoples R China;[3]Clemson Univ, Dept Forestry & Environm Conservat, Clemson, SC 29634 USA

年份：2024

卷号：35

期号：1

外文期刊名：JOURNAL OF FORESTRY RESEARCH

收录：;EI(收录号：20243216824483);Scopus(收录号：2-s2.0-85200364489);WOS:【SCI-EXPANDED(收录号:WOS:001283472700001)】；

基金：This research was supported by the "Pioneer" and "Leading Goose" R&D Program of Zhejiang (2022C02053), and National Natural Science Foundation of China (NSFC) (32201632).

语种：英文

外文关键词：RGB images; Random forest; LNC; N and P addition; Metasequoia

摘要：Recent advances in spectral sensing techniques and machine learning (ML) methods have enabled the estimation of plant physiochemical traits. Nitrogen (N) is a primary limiting factor for terrestrial forest growth, but traditional methods for N determination are labor-intensive, time-consuming, and destructive. In this study, we present a rapid, non-destructive method to predict leaf N concentration (LNC) in Metasequoia glyptostroboides plantations under N and phosphorus (P) fertilization using ML techniques and unmanned aerial vehicle (UAV)- based RGB (red, green, blue) images. Nine spectral vegetation indices (VIs) were extracted from the RGB images. The spectral reflectance and VIs were used as input features to construct models for estimating LNC based on support vector machine, random forest (RF), and multiple linear regression, gradient boosting regression and classification and regression trees (CART). The results show that RF is the best fitting model for estimating LNC with a coefficient of determination (R2) of 0.73. Using this model, we evaluated the effects of N and P treatments on LNC and found a significant increase with N and a decrease with P. Height, diameter at breast height (DBH), and crown width of all M. glyptostroboides were analyzed by Pearson correlation with the predicted LNC. DBH was significantly correlated with LNC under N treatment. Our results highlight the potential of combining UAV RGB images with an ML algorithm as an efficient, scalable, and cost-effective method for LNC quantification. Future research can extend this approach to different tree species and different plant traits, paving the way for large-scale, time-efficient plant growth monitoring.