10:45 AM - 11:00 AM
[ACG22-06] Large scale evaluation of decadal forest biomass changes using repeated airborne LiDAR observations in northern Japan.
Keywords:Airborne LiDAR, Forest, Biomass change
Decadal net biomass change had large spatial variation ranging from +35 to - 50 MgC ha-1, even after excluding the artificially logged plots during the period. The average was 4.06±6.44 (SD) MgC ha-1, where the photosynthetic biomass increase was 11.7±4.79 MgC ha-1 and the tree carbon decrease, caused by coarse woody litter or tree falling, was 8.71±4.08 MgC ha-1. These values were comparable with the results obtained from ground surveys or tower flux observations operated in Hokkaido, northern Japan. The decadal net biomass change was significantly lower at high elevation, north facing slope, large tree height variance, and coniferous forest, and significantly higher at south facing slope, deciduous forest, and secondary forest. The photosynthetic biomass increase was linearly correlated with the decadal average of the MODIS Vegetation Indices, with r2=0.64 for NDVI and 0.52 for Green ratio, which implies the application of MODIS Vegetation Indices to further large scale estimation of forest biomass change using satellite observation.