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Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (13): 26-31.doi: 10.11924/j.issn.1000-6850.casb2024-0672

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Effects of Proportional Fertilization on Chlorophyll Fluorescence Characteristics and Photosynthetic Physiology of Carya cathayensis Seedling

JI Linlin1,2(), SUN Weimin1,2, CHEN Suchuan1,2(), WANG Fei1,2, FU Xiaoyao1,2, CUI Can1,2, WU Zhihui3, ZHANG Junpei4   

  1. 1 Anhui Academy of Forestry, Hefei 230031
    2 Anhui Shahe Forest Breeding National Long-term Scientific Research Base, Chuzhou, Anhui 239004
    3 Forestry Development Center of Ningguo City, Ningguo, Anhui 242300
    4 State Key Laboratory of Tree Genetics and Breeding/ Key Laboratory of Tree Breeding and Cultivation of the State Forestry and Grassland Administration/ Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091
  • Received:2024-11-08 Revised:2025-03-20 Online:2025-05-05 Published:2025-05-07

Abstract:

This study investigated the effects of proportional fertilization on chlorophyll fluorescence characteristics and photosynthetic physiology in Carya cathayensis seedlings to provide technical guidance for fertilization management during seedlings cultivation. Using an L9(34) orthogonal experiment design with non-fertilization as control, three fertilization factors (N, P, K) were applied on May 12, 2023. Chlorophyll fluorescence parameters and photosynthetic physiological indices were measured on August 17, followed by comprehensive evaluation of different treatments. Fertilization significantly increased the chlorophyll (a+b) content and net photosynthetic rate (Pn). The T3 treatment (urea 32.61 g/plant, calcium superphosphate 333.33 g/plant, potassium chloride 129.04 g/plant) achieved the highest Pn [16.59 μmol/(m2·s)]. The T4 treatment (urea 65.22 g/plant, calcium superphosphate 83.33 g/plant, potassium chloride 64.52 g/plant) showed the highest transpiration rate [Tr=7.49 mmol/(m2·s)], significantly exceeding the control. All fertilization formulas significantly improved photochemical efficiency [Y()], photochemical quenching (qP), non-photochemical quenching (NPQ), and maximum quantum yield (Fv/Fm). The T1 treatment (urea 32.61 g/plant, calcium superphosphate 83.33 g/plant, potassium chloride 64.52 g/plant) yielded the highest Y () (0.53), and CK, T7 treatment was the lowest (0.49). T5 (urea 65.22 g/plant, calcium superphosphate 166.66 g/plant, potassium chloride 129.04 g/plant) achieved peak qP (0.79). The T8 treatment showed maximum NPQ (0.99), and T3 attained the highest Fv/Fm (0.81). Strong positive correlations were observed between Pn and both Tr (P<0.01) and Y() (P<0.01). Based on membership function analysis, T3 demonstrated optimal fertilization effects, exerting the greatest influence on photosynthetic characteristics.

Key words: Carya cathayensis, seedlings, proportional fertilization, chlorophyll fluorescence, physiology, comprehensive evaluation