Global 1km Spatial distribution of aboveground biomass forests in 2004

Forest ecosystems are an important component of the global carbon cycle, and accurate estimation of global forest aboveground biomass is of great significance for estimating global forest carbon storage. Lidar technology has been proven to accurately capture the horizontal and vertical structure of forests, enabling precise estimation of aboveground biomass in forests. This study utilizes ground survey data, optical imagery ICESat GLAS、 A forest aboveground biomass estimation model was constructed by combining climate and terrain data with a random forest model, and a global forest aboveground biomass distribution map with a resolution of 1km was drawn. The results indicate that the average global forest aboveground biomass is 210.09 Mg/ha, with a standard deviation of 109.31 Mg/ha. The research results were validated at both single point and ecological scale: at the single point level, the predicted results had an R2 of 0.56 and an RMSE of 87.53 Mg/ha compared to ground data; At the ecological level, R2 and root mean square error are 0.56101.21 Mg/ha, respectively. The forest aboveground biomass products drawn in this study are basically consistent with the results of forest aboveground biomass products in other regions, but show significant underestimation compared to some regional products.