焦土之上：美国西部森林火灾后的再造林与辅助迁移

Over the past few decades, severe wildfires have torched more and more land in the western United States. Fires that burn so hot and fast that they destroy most trees slow natural regeneration because many conifers need live trees to seed the next generation. Here, the annual reforestation need represents the amount of severely burned land that was more than 100 meters from a viable seed source. 700 thousand 600 500 Area (hectares) 400 300 200 100 0 High-severity burns Estimated reforestation needs Middle 50% of estimates Since 2000, the average annual area burned in high-severity fires has increased fivefold, relative to 1984–99. 1985 1990 1995 2000 2005 2010 2015 2020 contained until December. …