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The Kyoto Protocol aims for a 6% of reduction in CO2 emission, requiring clean and biomass energy technology instead of fossil fuels. The large paddy fields found in Japan act as a CO2 fixation and a biomass energy source. These paddy fields are also sources of CH4, which has 21 times the greenhouse effect of CO2. The author has developed a monitoring method based on a photosynthesis type of grain production model using meteorological data and the Normalized Difference Vegetation Index NDVI. The present research estimated the amount of fixation by ten paddy fields in Japan. An average value of 3, 950 gCO2/m2/yr was calculated, based on the accumulated seasonal photosynthetic fixation of CO2. The amount of CO2 fixation of 31.32 Mt CO2/yr by paddy fields in whole Japan was estimated from the average harvest index HI=0.45. The division of fixed CO2 into rice, straw and root portions of plant biomass was evaluated and validated by a carbon weight included in average rice production from 1993 to 2000

EVALUATION OF CO2 FIXATION IN JAPANESE PADDY FIELDS BY A PHOTOSYNTHESIS MODEL USING SATELLITE DATA