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- W2349475466 abstract "Seasonal drought frequently occurred in the mid-subtropical region of China.In situ measurements based on eddy covariance(EC) system showed that canopy latent heat flux was suppressed during the dry seasons at Qianyanzhou(QYZ) site.Drought-induced decrease in canopy latent heat flux is greatly challenged by terrestrial ecosystem models.In this paper,an ecosystem model EALCO(Ecological Assimilation of Climate and Land Observations) was used for simulating the seasonal drought effects on the fluxes of energy and heat by validating against the EC measurements.The results indicated that the EALCO model agreed well with the observed diurnal variations of net radiation(Rn),sensible(H) and latent(LE) heat fluxes.The values of square of correlation coefficient(R2) between the simulated and observed half-hourly Rn,H,and LE are 0.99,0.81,and 0.90,and root mean square error(RMSE) are 8.05,41.02,and 31.49 W.m-2,respectively.At daily scale,87% of the variance of the observed evapotranspiration(ET) was explained by the model.Model analysis suggested that canopy and soil water potential during the extremely dry period(the last-ten days of July in 2003) were double decreased compared to the same period but with very slight drought in 2004,and the time lag between root water uptake and canopy transpiration during dry period was shortened about half hour,and the simulated canopy conductance decreased 40-60%.Both observed and simulated Bowen ratio at noon time during the dry period in 2003 ranged from 1 to 2.2 but only 0.2 to 0.6 during slight drought periods in 2004.The success of the EALCO model in simulating the response of water and heat fluxes to seasonal drought is attributed from the application of Ball-Berry stomatal conductance model which has high capacity to describe stomatal behavior by coupling plant carbon and water processes in a good manner.The decrease in the simulated canopy latent heat flux is explained by the soil water constraint on the canopy stomatal conductance during the dry period at QYZ site in 2003." @default.
- W2349475466 created "2016-06-24" @default.
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- W2349475466 date "2011-01-01" @default.
- W2349475466 modified "2023-09-24" @default.
- W2349475466 title "Use a simulation model to study the difference response of water and heat flux to drought in mid-subtropical planted forest" @default.
- W2349475466 hasPublicationYear "2011" @default.
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