文献类型：期刊文献

英文题名：Assessing the Individual and Combined Contributions of Stand Age and Tree Height for Regional-Scale Aboveground Biomass Estimation in Fast-Growing Plantations

作者：Li, Xiaomin[1,2] Zhao, Dan[1,2,3] Chen, Junhua[1,2] Wu, Jinchen[1,2] Mu, Xuan[1,2] Zheng, Zhaoju[1] Xu, Cong[1] Fan, Chunjie[4,5] Zeng, Yuan[1,2] Wu, Bingfang[1,2,3]

第一作者：Li, Xiaomin

通信作者：Zhao, D[1];Zhao, D[2];Zhao, D[3]

机构：[1]Chinese Acad Sci, Aerosp Informat Res Inst, State Key Lab Remote Sensing & Digital Earth, Beijing 100101, Peoples R China;[2]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[3]Univ Chinese Acad Sci, Beijing Yanshan Earth Crit Zone Natl Res Stn, Beijing 101408, Peoples R China;[4]Chinese Acad Forestry, Res Inst Trop Forestry, State Key Lab Tree Genet & Breeding, Key Lab State Forestry, Guangzhou 510520, Peoples R China;[5]Zhejiang A&F Univ, Coll Forestry & Biotechnol, State Key Lab Subtrop Silviculture, Hangzhou 311300, Peoples R China

年份：2025

卷号：17

期号：17

外文期刊名：REMOTE SENSING

收录：;EI(收录号：20253719161512);Scopus(收录号：2-s2.0-105015792594);WOS:【SCI-EXPANDED(收录号:WOS:001570141300001)】；

基金：This research was supported by the National Key Research and Development Program of China (2022YFF1302100), the National Natural Science Foundation of China (Nos. 42371357, U23A2021), and the AIRCAS Project (No. E4Z202021F).

语种：英文

外文关键词：aboveground biomass; stand age; tree height; multi-source remote sensing; Eucalyptus

摘要：Accurate estimation of plantation aboveground biomass (AGB) is critical for quantifying carbon cycles and informing sustainable forest resource management, but enhancing estimation accuracy remains a key challenge. Although tree height and stand age are recognized as critical predictors for enhancing AGB models in addition to spectral vegetation indices, their individual and combined contributions in regional plantation forests remain insufficiently quantified, especially concerning the potential for leveraging the distinct characteristics of fast-growing plantations to facilitate AGB estimation. This study developed multi-source remote sensing-based Eucalyptus AGB estimation models for Nanning, Guangxi, integrating stand age and tree height to assess their impacts. Stand age was mapped from Landsat time-series imagery, and tree height was derived from UAV-LiDAR data. Plot-level reference AGB was obtained using fused UAV and terrestrial LiDAR point clouds. A random forest model, incorporating these variables with Sentinel-2 spectral information and topography, then achieved regional AGB estimation. The findings demonstrate that (1) tree height serves as the most influential predictor for AGB estimation at the regional scale, yielding a robust model performance (R2 = 0.84). (2) Tree height captures the majority of the explanatory power associated with stand age. Once tree height was included as a predictor, the subsequent addition of stand age offered no significant improvement in model accuracy (R2 = 0.85). (3) Given the challenges in obtaining precise tree height data and the robust correlation between stand age and tree height in fast-growing plantations, the integration of stand age substantially improved the accuracy of AGB estimations (from the spectral model of R2 = 0.54 to R2 = 0.74), with performance approaching that of tree height-based models (Delta R2 = 0.10). Consequently, in fast-growing plantations, which are often characterized by high stand homogeneity, a hybrid model incorporating stand age can offer a reliable and cost-effective solution for AGB estimation.