世界森林复盖面积38亿公顷,占地球陆地面积的29.7%,其中一半多(53%)分布在温带,其余部分(47%)分布在热带。在20.5亿公顷温带林中有16.5亿公顷(或80%)是郁闭林;而在17.5亿公顷热带林中,郁闭林只有12亿公顷(占69%)。1980年以来,世界木材年均采伐量达30亿立方米,其中一半 The world’s forests cover an area of ​​3.8 billion hectares, accounting for 29.7% of the Earth’s land area. More than half (53%) are in temperate zones and the rest (47%) are in tropical zones. Of the 2.05 billion hectares of temperate forests, 1.65 billion hectares (or 80%) are canopy forests. In the 1.75 billion hectares of tropical forests, there are only 1.2 billion hectares (69%) of them. Since 1980, the world’s average annual harvest of timber reached 3 billion cubic meters, half of them