[Diurnal variation of winter wheat water and heat fluxes of a simulation with photosynthesis-evapotranspiration coupled model].
A coupled model of winter wheat photosynthesis-evapotranspiration was established based on SPAC theory. Sensible heat and latent heat fluxes were calculated by two-layer model proposed by Shuttleworth and Wallace, and photosynthesis and evapotranspiration were coupled by the parameterization of canopy resistance. The model was validated with the data measured by eddy covariance method. The results showed that the simulated and observed values were accordant, and the model could simulate the diurnal variation of sensible heat and latent heat fluxes very well. Sensitivity analysis indicated that the sensitive parameters of canopy transpiration were wilting point, stomata conductance, reflectivity of leaves to infrared radiation, and convexity of photosynthesis response to light, while the sensitive parameter of soil evaporation was soil resistance. The model could be used to study the interactions between water and heat fluxes and environmental factors, and to instruct the irrigation scheme in the field.
Wang
Jing
J
Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. jingwang@igsnrr.ac.cn
Yu
Qiang
Q
Li
Xiangge
X
Sun
Xiaomin
X
D004734:Energy Metabolism; D006358:Hot Temperature; D008962:Models, Theoretical; D017440:Photoperiod; D010788:Photosynthesis; D018526:Plant Transpiration; D012621:Seasons; D012987:Soil / Q000032:analysis*; D014908:Triticum / Q000378:metabolism*; D014867:Water / Q000032:analysis*
D012987:Soil; D014867:Water