Abstract
The techniques for estimation of aboveground biomass were studied in Fengning Man Autono-mous County,Hebei Province,using SPOT5images and filed sample measurement data based on the esti-mate method by vegetation types.The study results shown that a multiple regression model,which was composed of 4band spectral reflectance of SPOT5images and Mid-infrared Vegetation Index(VI3)derived from SPOT5images,can be used for estimating forest biomass,the coefficient of determination(R2) reached 0.540.Through the correlation analysis of bush and grassland biomasses with various vegetation indices,it was found that the exponential model based on Ratio Vegetation Index(RVI)was the optimal model for estimating bush biomass,and the NDVI-based simple linear model was the optimal model for es-timating grassland biomass,with R2 values of 0.711and 0.790.The distribution map of biomass in Fengn-ing county was made using SPOT5images acquired in 2008.The map reflect that the total aboveground bi-omass(except the croplands)in 2008in Fengning is 3.706×107 t,with a average of 51.223t/hm2,in which,the total forest biomass is 3.578×107 t,the total bush biomass is 1.048×106 t,and the total grass-land biomass is 2.277×105 t.
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