What is a commercial coniferous forest from the nonfiction book, The Hidden Life of Trees?

Wohlleben often brings up the "commercial coniferous forest" as being one of the most common types of forest found in Germany today. Spruce, pine, and fir have been planted in many regions to harvest wood. Wohlleben points out that they are often put in habitats that they are actually not suited to. They are brought down from mountainous areas into warmer and drier climates.