文献类型：期刊文献

英文题名：Quantifying PSII Open Centers and Multiscale Photosynthetic Electron Transport With Solar-Induced Chlorophyll Fluorescence in Evergreen Forests

作者：Cong, Weiwei[1] Li, Xiao[1] Yang, Kaijie[2,3,4,5,6] Li, Yue[1] Jin, Chengcheng[1] Lu, Sen[7] Wang, Feng[2,3,4]

第一作者：Cong, Weiwei

通信作者：Wang, F[1];Wang, F[2];Wang, F[3];Lu, S[4]

机构：[1]Shenyang Agr Univ, Coll Agron, Shenyang, Peoples R China;[2]Chinese Acad Forestry, Inst Ecol Conservat & Restorat, Beijing, Peoples R China;[3]Chinese Acad Forestry, Inst Desertificat Studies, Beijing, Peoples R China;[4]Inst Great Green Wall, Bayannur, Peoples R China;[5]Hainan Int Blue Carbon Res Ctr, Haikou, Peoples R China;[6]Hainan Prov Acad Environm Sci, Haikou, Peoples R China;[7]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Efficient Prod Forest Resources, Beijing, Peoples R China

年份：2025

卷号：177

期号：6

外文期刊名：PHYSIOLOGIA PLANTARUM

收录：;Scopus(收录号：2-s2.0-105025062255);WOS:【SCI-EXPANDED(收录号:WOS:001640707500001)】；

基金：No generative AI tools were used in the writing or preparation of this manuscript.

语种：英文

外文关键词：cross-scale modeling; electron transport rate; Evergreen forest; fraction of PSII open centers (qL); solar-induced chlorophyll fluorescence (SIF)

摘要：Quantifying photosystem II (PSII) open reaction centers (q L) and their relationship with electron transport rate (ETR) is crucial for understanding photosynthetic dynamics across spatial scales. However, accurate estimation of these photosynthetic variables remains challenging due to observational constraints and complex environment-ecosystem feedbacks under dynamic conditions. A novel approach to mechanically quantify the q L and linear electron transport rates (J PSII) from PSII to photosystem I (PSI) using solar-induced chlorophyll fluorescence (SIF) at leaf and canopy scales was established, termed the SIF-qL redox model. The simulation was validated at two evergreen forest sites (ZGT and DEJU) using continuous pulse-amplitude modulated (PAM) chlorophyll fluorescence and flux measurements. At the leaf-scale, the model demonstrated high accuracy in predicting q L for needleleaf vegetation in ZGT (R 2 = 0.82, RMSE = 0.09), but performed poorly in DEJU (R 2 = 0.45). The model accurately simulated J PSII dynamics at both sites at the leaf level (R 2 = 0.92-0.97). When scaled to canopy level, the model maintained reliable predictive capability for J PSII (R 2 = 0.62-0.71). The simulations captured distinct q L dynamics: at ZGT, q L declined with increasing PAR, particularly at lower temperatures, while DEJU showed minimal temperature-dependent variation. The observed J PSII- q L relationships revealed that Ribulose-1,5-bisphosphate (RUBP) generation limitations on J PSII were dominant at both sites. This study developed a SIF-qL redox model to mechanistically connect chlorophyll fluorescence with photosynthetic dynamics, while validating the cross-scale applicability of leaf-level parameters in canopy-scale simulations. Future refinements should address species- and environment-specific adaptations to enhance the universal applicability of the ecosystem photosynthesis process.