Fig. 1
From: The national forest inventory in China: history - results - international context
Development of Forest Areas of the eight NFIs in China. (FA1—Forest areas only inclcuding ≥0.4 (or 35 %) closed cover forests and economic shrubs; FA2—Forest areas also including 0.2–0.3 (or 20–35 %) cover forests and economic shrubs; FA3—Forest areas including both ≥0.2 (or 20 %) cover forests and all special shrubs (Wang and Hou 2014); FA4—Forest areas published in eight NFIs