Sydänytimeen

Sydänytimeen is a Finnish term that translates to "heartwood" in English. It refers to the dense, non-living central wood of a tree. Unlike the sapwood, which is responsible for transporting water and nutrients, the heartwood's primary function is structural support. It is typically darker in color and more resistant to decay and insect infestation due to the presence of various extractives like resins, gums, and oils.

The formation of heartwood is a gradual process that begins as the tree ages. As the sapwood cells in the center of the stem mature, they become impregnated with these protective substances and lose their physiological activity. This transformation contributes to the tree's overall strength and longevity.

Heartwood is highly valued in woodworking and construction for its durability and stability. It is often used for applications where resistance to rot and wear is important, such as in outdoor furniture, decking, and structural beams. Different tree species have varying qualities of heartwood. For example, oak heartwood is known for its strength and resistance to water, while redwood heartwood is prized for its natural resistance to insects and decay. The presence and extent of heartwood can be a significant factor in determining a tree's timber value.