文献类型：期刊文献

英文题名：Shading Effects on the Growth and Physiology of Endangered Hopea hainanensis Merr. & Chun Seedlings

作者：Huang, Chuanteng[1,2,3] Lin, Ling[1,2,3] Chen, Feifei[1,2,3] Wang, Xuefeng[4] Shi, Mengmeng[4] Chen, Lin[1,2,3] Yang, Xiaoli[1,2,3] Dong, Xiaona[1,2,3] Zhang, Mengwen[1,2,3]

第一作者：Huang, Chuanteng

通信作者：Chen, FF[1];Chen, FF[2];Chen, FF[3]

机构：[1]Hainan Acad Forestry, Hainan Acad Manyrove, Haikou 571100, Peoples R China;[2]Innovat Platform Academicians Hainan Prov, Haikou 571100, Peoples R China;[3]Key Lab Trop Forestry Resources Monitoring & Appli, Haikou 571100, Peoples R China;[4]Chinese Acad Forestry, Res Inst Forest Resource Informat Tech, Beijing 100091, Peoples R China

年份：2025

卷号：16

期号：7

外文期刊名：FORESTS

收录：;EI(收录号：20253018862510);Scopus(收录号：2-s2.0-105011667995);WOS:【SCI-EXPANDED(收录号:WOS:001535779900001)】；

基金：This research was funded by the specific research fund of the Innovation Platform for Academicians of Hainan Province (YSPTZX202001).

语种：英文

外文关键词：shading; growth; gas exchange; leaf pigments; biomass accumulation; adaptation

摘要：To determine optimal light conditions for Hopea hainanensis Merr. & Chun seedling growth, this study examined growth and physiological parameters under four shading treatments (0%, 30%, 60%, and 90% irradiance reduction) over 12 months. Shading significantly affected the growth adaptability of seedlings. As shading increased, height, leaf traits (area, length, width), and light saturation point all initially increased, peaked at 30% shading, and then decreased. Conversely, basal diameter, leaf thickness, the maximum net photosynthetic rate, net photosynthetic rate, photosynthetic quantum efficiency, transpiration rate, and stomatal conductance progressively declined as shading increased. Biomass accumulation (in stems and roots), dark respiration rate, and light compensation point exhibited a U-shaped response to shading, being minimized under low or moderate shading. All shading treatments significantly reduced biomass and photosynthetic performance compared to controls. Multivariate analysis identified 0%-30% shading as optimal for cultivation, with 30% shading enhancing photomorphogenic responses while maintaining photosynthetic efficiency. The study findings suggest a novel seedling cultivation protocol for nursery use, in which initial establishment occurs under 30% shading to maximize vertical elongation, followed by the progressive reduction in shading to stimulate radial growth and optimal biomass partitioning. This approach mimics natural canopy gap dynamics, effectively mimicking natural regeneration in tropical rainforest ecosystems.