Using CASA model,biomass within the Haihe River basin during 2002-2007 was estimated based on remote sensing images,corresponding data of temperature,precipitation and solar radiation,and 1∶400 000 0maps of vegetation coverage in China.Variations in the biomass with vegetation type and vegetation coverage in 2007 were analyzed.Meanwhile,its temporal and spatial changes were discussed.The results validate the applicability of CASA model in the estimation of biomass within the Haihe River basin.During the past 6years,annual average biomass within the basin was 405.5Tg in total;annual average biomass in the basin was high in the southeast but low in the northwest,namely plains> mountains> plateaus.
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