A STUDY ON THE TURBULENCE FLUXES OF THE SURFACE LAYER CO2,SENSITIVE AND LATENT EXCHANGE OVER THE TYPICAL RICE FIELD, CHANGJIANG DELTA
长江三角洲典型稻作区近地层二氧化碳等湍流通量的观测研究

Based on the integrated observation of the surface atmosphere and the agriculture ecosystem at Changjiang Delta, we study the fluxes of surface layer CO 2 as well as the turbulence such as the sensible heat, latent heat and momentum during the transplant, joint and tassel of the rice growth stages for the rice field at Changshu, Jiangsu Province. The result shows that the rise field acts as a sink of CO 2 for every growth stage. The rice absorbs CO 2 during daytime while emits it during nighttime. The absorption amount of CO 2 during the tassel stage is larger than that in the stages of transplant and joint. The surface layer is a heat source of atmosphere and the heating is mainly through latent exchange. The ratio of sensible to latent fluxes is only 0.058 during the tassel stage. Remarkable correlations exits between change of the turbulence fluxes of CO 2 and the components of radiation balance, as well as different meteorological factors.