Welcome to Journal of Agriculture,

Journal of Agriculture ›› 2026, Vol. 16 ›› Issue (1): 7-16.doi: 10.11923/j.issn.2095-4050.cjas2024-0212

Previous Articles     Next Articles

Characterization of Spring Wheat Light Response Curve and Fitting Analysis of Photosynthetic Model Under Different Moisture Conditions in Semi-arid Areas

ZHAO Pengwei1(), GAI Aihong1(), WANG Xiaoping2, LU Congcong1, LIU Tao1, LI Yingying1, ZHANG Tao3   

  1. 1 College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070
    2 Institute of Arid Meteorology, China Meteorological Administration/ Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province, Lanzhou 730020
    3 Deyang Agricultural College, Deyang, Sichuan 618500
  • Received:2024-11-27 Revised:2025-02-24 Online:2026-01-20 Published:2026-01-15

Abstract:

To investigate the mechanism of photosynthetic physiological response of spring wheat under different moisture conditions in semi-arid rain-fed agricultural areas and to optimize field management, the present study was carried out with spring wheat ‘Dingxi No. 48’ as the research object. Seven treatments were set up with three replications for each treatment, namely: film mulching (FM), irrigated treatment 1 (GG1), irrigated treatment 2 (GG2), drought treatment 1 (GH1), drought treatment 2 (GH2), drought treatment 3 (GH3), and rain-fed treatment (YY), to measure the light response curves of spring wheat at different periods under the seven treatments. Five models were chosen, namely, the right-angle hyperbola model, the non-right-angle hyperbola model, the leaf drift model, the exponential model and the double exponential model, to fit and compare the light response curves before and after the irrigation of spring wheat. The results were analyzed for accuracy and the optimal model was selected. The results showed that: (1) the light response curve increased rapidly when the photosynthetically active radiation was 0-400 μmol/(m2·s), and slowed down when it was 600-800 μmol/(m2·s), and then stabilized or showed a decreasing trend. The leaf area index of spring wheat decreased after filling, and the photosynthetic capacity weakened, and the magnitude of the maximum net photosynthetic rate at the maturity of each treatment was in the following order: FM, GG1, YY, GH3, GG2, GH2, and GH1. (2) Combining the MAE, RMSE and R2 of the measured and fitted values of the five models shows that the leaf float model has the highest fitting accuracy. The mulching treatment had the best drought tolerance and the widest range of light adaptation when planting spring wheat in the semi-arid rain-fed agricultural region of Northwest China, and the leaf floating model among the five models best matched the actual photosynthetic characteristics of spring wheat.

Key words: semi-arid areas, spring wheat, light response curve, model fitting