Eddy covariance technique was used to measure the surface fluxes (sensible flux and latent flux) of a Potentilla fru-ticosa shrub meadow (SRM) and a Kobresia humilis swamp meadow (SWM) on the Qinghai-Tibetan Plateau from January 2003 to July 2004. Results show that the surface fluxes had been recorded with significant diurnal and seasonal variations. Among them, April saw the highest monthly sensible flux, and January the lowest, while the latent fluxes maximum appeared in May. Diurnal sensible flux amplitude significantly changed with season alternations. Within the same month, the maximal diurnal sensible flux of the K. humilis shrub meadow was higher than that of the P. fruticosa swamp meadow, and the diurnal amplitude of the former excelled that of the latter. Different seasons also altered the time in which the diurnal latent flux and the amplitude vibration force reaching the peaks During the plant dormant season, the maximal diurnal sensible flux appeared between 1:00 pm to 3 : 00 pm and the diurnal amplitude was weak. During the plant growing seasons, the maximal diurnal sensible fluxes occurred in midday, 12:00 am, with strong diurnal amplitude. There exists a linearity or exponential relationship between surface fluxes and air temperature in the two meadows. The responses of the P. fruticosa shrub meadow latent flux to temperature were stronger than those of the K. humilis swamp meadow. each month. The responses of the shrub meadow sensible flux to temperature were stronger than those of the swamp meadow in January. It was the reverse in April and October. In July, the response of sensible flux to temperature of the two was similar.
NETL
NSTL
维普
万方数据
