Global aboveground biomass carbon density of grass in the year 2010

This layer represents the aboveground biomass (AGB) carbon (C) density estimates for grass that were used to create the harmonized global AGB C density map of Spawn et al. (2020). It has been scaled by 10 to reduce file size and should by multiplied by 0.1 before analysis to attain units of megagrams C per hectare (MgC/ha). Since grass may coexist with other vegetation types within the extent of a given grid cell, estimates in this layer have been proportionally adjusted to account for the relative spatial extent that grass is assumed to occupy in each grid cell. Grid cells that do not contain grass report a value of zero. As such, taking the pixelwise sum of the accompanying layers for tree, grass, tundra and crop AGB C will produce the harmonized global AGB C density map of Spawn et al. (2020).

本图层用于呈现用于制作Spawn等人2020年发布的标准化全球地上生物量（aboveground biomass, AGB）碳（carbon, C）密度图的草本植物地上生物量碳密度估算结果。为压缩文件体积，该数据已进行10倍缩放；分析前需将其乘以0.1，以获得单位为每公顷兆克碳（megagrams C per hectare, MgC/ha）的结果。由于在给定网格单元范围内，草本植物可能与其他植被类型共存，因此本图层的估算值已按比例调整，以反映草本植物在每个网格单元中所占的相对空间占比。未包含草本植物的网格单元取值为0。据此，将配套的林木、草本、苔原与农作物地上生物量碳图层的逐像素求和结果累加，即可得到Spawn等人2020年发布的标准化全球地上生物量碳密度图。