Global belowground biomass carbon density of tundra vegetation in the year 2010

This layer represents the belowground biomass (BGB) carbon (C) density estimates for tundra vegetation that were used to create the harmonized global BGB 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 tundra vegetation 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 tundra vegetation is assumed to occupy in each grid cell. Grid cells that do not contain tundra vegetation report a value of zero. As such, taking the pixelwise sum of the accompanying layers for tree, grass, tundra and crop BGB C will produce the harmonized global BGB C density map of Spawn et al. (2020).本图层为用于生成Spawn等人2020年标准化全球地下生物量（belowground biomass, BGB）碳（carbon, C）密度地图的苔原植被地下生物量碳密度估算结果。为缩减文件体积，该图层已进行10倍缩放，分析前需乘以0.1以获得每公顷兆克碳（megagrams C per hectare, MgC/ha）的单位。由于在给定网格单元范围内，苔原植被可能与其他植被类型共存，本图层的估算值已按比例调整，以反映苔原植被在每个网格单元中所占的相对空间占比。不包含苔原植被的网格单元数值为0。据此，将配套的林木、草本、苔原与作物地下生物量碳图层按像素逐点求和，即可得到Spawn等人2020年的标准化全球地下生物量碳密度地图。