Simulation of diurnal variations of CO2, water and heat fluxes over winter wheat with a model coupled photosynthesis and transpiration
Simulation of diurnal variations of CO2, water and heat fluxes over winter wheat with a model coupled photosynthesis and transpiration
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DOI：
10.1016/j.agrformet.2006.02.007
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发表时间：
2006-04
影响因子：
6.2
通讯作者：
Jing Wang;Qiang Yu;Jun Li;Longhui Li;Xiangge Li;Guirui Yu;Xiaomin Sun
中科院分区：
文献类型：
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作者：
Jing Wang;Qiang Yu;Jun Li;Longhui Li;Xiangge Li;Guirui Yu;Xiaomin Sun
建立了冬小麦冠层光合作用与蒸腾作用的耦合模型。该模型将两层蒸散发模型与光合-气孔导度耦合模型相结合，研究了冬小麦CO2、水分和热通量的日变化规律。在华北平原玉城综合试验站进行了田间试验，对模型进行了评价。2002-2003年用涡动相关法测量了气候变量和CO2、水和热通量的半小时数据。对实测通量数据的分析表明，尽管土壤得到了良好的灌溉，但由于水汽亏缺和冠层温度偏高，导致气孔关闭，导致光合作用午间明显下降。净辐射、co2通量、感热通量和潜热通量的模拟值与实测值吻合较好，证明了光合-蒸腾耦合模型的预测能力。讨论了CO2通量、冠层导度和潜热通量对气候因子变化的响应，表明该模型不仅可以用于华北平原小麦的CO2、水和热通量预测，还可以用于中国其他气候区。
A model was developed that couples canopy photosynthesis and transpiration of winter wheat. The model combined a two-layer evapotranspiration model with a coupled photosynthesis–stomatal conductance model to study the diurnal variations of CO2, water and heat fluxes of winter wheat. Field experiments were conducted in Yucheng Comprehensive Experimental Station in the North China Plain to evaluate the model. Half-hourly data of weather variables and CO2, water and heat fluxes were measured by the eddy covariance method in 2002–2003. An analysis of measured flux data showed that there was an evident midday depression of photosynthesis, caused by stomatal closure due to high vapor water deficit and canopy temperature though the soil was well irrigated. There was a close agreement between simulated and measured net radiation, CO2flux, sensible and latent heat fluxes, which proved the predictive power of the coupled photosynthesis and transpiration model. The response of CO2flux, canopy conductance and latent heat flux to changes in climatic factors was discussed, which indicated the model could be used to predict CO2, water and heat fluxes of wheat not only in the North China Plain, but also in other climatic regions in China.