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Hayato Tsuzuki'[, RossNelson'Zand Tatsuo Sweda'i ABSTRACT [[he timber stock of rnainland Ehime prefecture was estimated using airborne laser profiling data. Our provisional analysis revealed that: 1) at 5,435km2, the laser estimate of land area obtained as a simple product of fiight path length and its 4km width was fAirly consistent with the figure of 5,455kmt by the Geegraphical Survey Institute, censidered the most reliable of the government statistics; 2) on the ether hand, at 176 rnillion m3 for the entire prefecture our estirnate of standing timber steck turned out te be twice as much as the gevernment figure of 87 million JnU; 3) judging from the precision in land-area estimation and results from other research, our estimate is considered more likely te represent the actual timber steck than the gevernment figure; 4) thus airborne laser altimetry would provide more accurate nationai forest carbon budget ior the Kyote Protocol than does the existing national forest inventory; 5) at the present density ef ]aser profiling transects, 41crn apart from each ether, however, no reasonable accuracy is expected a"he municipality level.Keliwents: timber stock, airberne laser profiling, prefecture-wide inventory, Ehime prefecture, Kyoto protocol