文献类型：期刊文献

英文题名：Estimating canopy chlorophyll in slash pine using multitemporal vegetation indices from uncrewed aerial vehicles (UAVs)

作者：Luan, Qifu[1] Xu, Cong[2] Tao, Xueyu[1] Chen, Lihua[3] Jiang, Jingmin[1] Li, Yanjie[1]

第一作者：栾启福

通信作者：Li, YJ[1]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Natl Forestry & Grassland Engn Technol Res Ctr Exo, 73 Daqiao Rd, Hangzhou 311400, Zhejiang, Peoples R China;[2]Univ Canterbury, New Zealand Sch Forestry, Private Bag 4800, Christchurch 8140, New Zealand;[3]Hangzhou Acad Forestry Sci, Hangzhou 310022, Zhejiang, Peoples R China

年份：2024

卷号：25

期号：2

起止页码：1086-1105

外文期刊名：PRECISION AGRICULTURE

收录：;Scopus(收录号：2-s2.0-85181690496);WOS:【SCI-EXPANDED(收录号:WOS:001137662500001)】；

基金：No Statement Available

语种：英文

外文关键词：Uncrewed aerial vehicles (UAVs); Multispectral and multitemporal; Canopy chlorophyll content; Vegetation indices; Pinus elliottii

摘要：Canopy Chlorophyll Content (CCC) is an important physiological indicator that reflects the growth stage of trees. Accurate estimation of CCC facilitates dynamic monitoring and efficient forest management. In this study, we used high-resolution remote sensing images obtained by uncrewed aerial vehicles (UAVs) equipped with multispectral sensors (red, green, blue, near-infrared, and red-edge) to estimate CCC of lodgepole pine (Pinus elliottii). Our aim was to determine the optimal machine learning model between support vector regression (SVR) and random forest regression (RFR) for predicting CCC and to evaluate the effectiveness of multispectral bands along with 21 vegetation indices (VIs) in the estimation process. Individual tree boundaries were derived from the canopy height model (CHM) based on three-dimensional (3D) point clouds generated using structure from motion. These images, combined with continuous field measurements from January to December, provided comprehensive data for our analysis. The results showed that the SVR method outperformed the RFR method in estimating leaf chlorophyll content (LCC), with fitting R-2 values up to 0.692 and RMSE values up to 0.168 mg center dot g(-1). Overall, the study highlights the potential of UAV-based remote sensing for multitemporal forest monitoring, offering advances in precision forestry and tree breeding.