| Photosynthesis-transpiration coupling simulation in leaf and canopy scales of winter wheat |
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| DOI：10.7606/j.issn.1000-7601.2023.05.23 |
| Key Words: wheat stomatal conductance-photosynthesis-transpiration coupling model leaf scale canopy scale simulation |
| Author Name | Affiliation | | ZHAO Yang | Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Key Laboratory of Agricultural Water Resources, Chinese Academy of Sciences, Hebei Laboratory of Water\|Saving Agriculture, Shijiazhuang, Hebei 050022, China
College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China | | ZHANG Chuanwei | Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Key Laboratory of Agricultural Water Resources, Chinese Academy of Sciences, Hebei Laboratory of Water\|Saving Agriculture, Shijiazhuang, Hebei 050022, China
College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China | | SHEN Yanjun | Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Key Laboratory of Agricultural Water Resources, Chinese Academy of Sciences, Hebei Laboratory of Water\|Saving Agriculture, Shijiazhuang, Hebei 050022, China | | ZHANG Yucui | Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Key Laboratory of Agricultural Water Resources, Chinese Academy of Sciences, Hebei Laboratory of Water\|Saving Agriculture, Shijiazhuang, Hebei 050022, China |
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| Abstract: |
| Synthetic model of photosynthesis-transpiration based on stomatal behavior (SMPT-SB) was used to simulate the diurnal variation in photosynthesis and transpiration rate of winter wheat at leaf-and canopy-scales. The results were validated by in-situ measurements from photosynthesis instrument and eddy covariance. The results showed that the simulated leaf- and canopy-scale photosynthesis and transpiration rate were in good agreement with in-situ measurements. The daily average absolute error of photosynthesis rate was less than 1 μmol·m-2·s-1, and that of transpiration rate was less than 0.41 mmol·m-2·s-1. The determination coefficient of linear regression (R2) between the simulated and measured leaf-scale photosynthesis and transpiration rate were all larger than 0.90, and R2 also reached 0.96 and 0.88 on the canopy scale, respectively. In addition, when the water vapor response function in the model was expressed as f(Ds)=RH, large changes in relative humidity (RH) caused inaccurate simulation of the stomatal conductance (gs) variation through the parameter m. If m was calibrated according to the crop growth periods, the simulation accuracy was greatly improved. As the calculation method of the model was relatively simple and most parameters were easy to access. The model can be used to simulate water and carbon exchange between soil-plant-atmosphere at leaf and canopy scales of winter wheat. |
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