Diurnal variation of winter wheat water and heat fluxes of a simulation with photosynthesis-evapotranspiration coupled model

Abstract

Abstract: 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 Shuttle worth 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.

Key words: Photosynthesis-evapotranspiration coupled model, Water and heat fluxes, Diurnal variation

CLC Number:

Q945.11

WANG Jing, YU Qiang, LI Xiangge, SUN Xiaomin . Diurnal variation of winter wheat water and heat fluxes of a simulation with photosynthesis-evapotranspiration coupled model[J]. Chinese Journal of Applied Ecology, 2004, (11): 2077-2082.

References

[1] Anadranistakis M,Kerkides P,Liakatas A,et al.1999.How significant is the usual assumption of neutral stability in evapotranspiration estimating models.Meteor,6:155～158
[2] Anadranistakis M,Liakatasb A,Kerkides P,et al.2000.Crop water requirements model tested for crops grown in Greece.Agric Water Man,45:297～316
[3] Ben Mehrez M,Taconet O,Vidal-Madjar D,et al.1992.Estimation of stomatal resistance and canopy evaporation during the Hapex-Mobilhy experiment.Agric For Meteor,58:285～313
[4] Brenner AJ,Incoll LD.1997.The effect of clumping and stomatal response on evaporation from sparsely vegetated shrublands.Agric For Meteor,84:187～205.
[5] Chen J.1984.Uncoupled multilayer model for the transfer of sensible and latent heat flux densities from vegetation.Boundary-Layer Meteor,28:213～225
[6] Choudhury BJ,Monteith JL.1988.A four-layer model for heat budget of homogeneous land surfaces.QJR Meteor Soc,14:373～398
[7] Garratt JR.1978.Transfer characteristics for a heterogeneous surface of large aerodynamic roughness.QJR Meteor Soc,104:491～502
[8] Goudriaan J,Waggoner PE.1972.Simulating both aerial microclimate and soil temperature from observations above the foliar canopy.Neth J Agric Sci,20:104～124
[9] Kang S-Z(康绍忠),Liu X-M(刘晓明),Xiong Y-Z(熊运章).1994.Theory of Water Transport in Soil-Plant-Atmosphere Continuum and Its Application.Beijing:China Water Conservancy and Electric Power Press.30～50(in Chinese)
[10] Monteith JL.1975.Vegetation and the Atmosphere Principles.London:Academic Press.
[11] Philip JR.1966.Plant water relations:Some physical aspects.Ann Rev Plant Physiol,17:245～168
[12] Shaw RH,Pereira AR.1982.Aerodynamic roughness of a plant canopy:A numerical experiment.Agric For Meteor,26:51～65
[13] Shuttleworth WJ,Gurney RJ.1990.The theoretical relationship between foliage temperature and canopy resistance in sparse crops.QJR Meteor Soc,116,498～519
[14] Shuttleworth WJ,Wallace JS.1985.Evaporation from sparse crops-an energy combination theory.QJR Meteor Soc,111:839～855
[15] Sun R(孙睿),Liu C-M(刘昌明).2003.A review on research of land surface water and heat fluex.Chin J Appl Ecol(应用生态学报),14(3):424～438(in Chinese)
[16] Tang D-Y(唐登银),Xie X-Q(谢贤群).1996.Experimental Studies on Water and Energy Balance in Agricultural Lands.Beijing:China Meteorological Press.18～22(in Chinese)
[17] Thom AS,Oliver HR.1977.On Penman's equation for estimating regional evaporation.QJR Meteor Soc,103:345～357
[18] van Bavel CHM,Hillel DI.1976.Calculating potential and actual evaporation from a bare soil surface by simulation of concurrent flow for water and heat.Agric Meteor,17:453～476
[19] Yu Q,Wang TD.1998.Simulation of the physiological response of C3 plant leaves to environmental factors by a model which combines stomatal conductance,photosynthesis and transpiration.Acta Bot Sin,40(8):740～754