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Nitrogen Immobilization by Wood Fiber Substrates Strongly Affects the Photosynthetic Performance of Lettuce

文献类型： 外文期刊

作者： Wu, Lingyi 1 ; Li, Ruohan 1 ; Liu, Juncheng 2 ; Cui, Wenzhong 2 ; Qi, Zhiyong 1 ; Zhou, Wanlai 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Urban Agr, Chengdu 610213, Peoples R China

2.Chengdu Univ, Sch Mech Engn, Chengdu 610100, Peoples R China

关键词： chlorophyll fluorescence; JIP test; PSI; PSII

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2025 年 14 卷 10 期

页码：

收录情况： SCI

摘要： Wood fiber substrates are widely used as peat substitutes in horticulture, but the impact of their high carbon-to-nitrogen ratio on nitrogen immobilization and crop photosynthetic performance remains unclear. This study systematically examined the effects of wood fiber substrates on lettuce photosynthetic performance and underlying physiological mechanisms using pot experiments. Two substrate treatments-peat (control) and wood fiber-were combined with three nitrogen levels: low, medium, and high (63, 127, and 210 mg NL-1). Results indicated that wood fiber substrates significantly reduced the availability of fast-acting nitrogen, leading to a substantial decrease in lettuce biomass (39.0-56.8%), total nitrogen content (7.2-39.9%), and chlorophyll content (13.7-36.2%). Chlorophyll fluorescence kinetics analysis revealed that wood fiber substrates impair photosystem function through multiple pathways. At the early stage (15 days), key effects included structural damage to the donor side of PSII(Photosystem II), indicated by L and K peaks, and inhibited electron transfer on the PSI(Photosystem I) acceptor side (delta Ro decreased by 15.08-27.90%, along with a reduction in WOI amplitude). The findings provide an important theoretical basis for optimising nitrogen management strategies for wood fibre substrates.

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