What is the most common tree used in paper production?

The most common tree used in paper production is the spruce tree, particularly species like Norway spruce. Other frequently used trees include pine and fir, which are valued for their long fibers that contribute to the strength and quality of the paper. These softwood trees are preferred due to their faster growth rates and higher yield of pulp. Additionally, hardwoods like eucalyptus are also used for specific types of paper, offering different qualities.