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Layering - a form of vegetative reproduction in which live tree branches are buried in the debris on the forest floor and they sprout roots and live stems to regenerate a forest. Leaching - the process by which soluble matter is dissolved in groundwater and carried downward and radially through the soil. Leaf - (pl. leaves) the thin, usually flat, green parts that grow on a tree or other plant. Leaves use the carbon dioxide of the air in which they live and light from the sun to carry on photosynthesis. Leaflets - smaller parts of compound leaves that often resemble leaves. They join together along the petiole and the petiole attaches to the twig. Leaf Margin - the outer edge of a leaf; useful for tree identification purposes. Life Stages - the stages a tree goes through during its life (germination, growth, maturity, reproduction, decline, and death). Lignin - a major component of wood making up 25% of the total material in wood; functions to bind wood components together. Limiting Factor - a factor that limits the growth, abundance, or distribution of a population of organisms in an ecosystem (e.g., water, nutrients, sunlight, prey, etc.). Litter Layer - surface layer of the forest floor composed of leaves, twigs, needles, etc. with minimal decomposition. Loam - a soil that is a mixture of sand, silt, and clay. Lobed - a type of leaf edge that has large rounded parts. Loess - wind-deposited soil material. Log - unit used to measure the height of a tree; one log equals 16'. Logger - a person who cuts trees to sell to saw mills and other wood using businesses. Logging - the removal of trees from the forest for lumber. Lumber - boards sawn from logs. Lumber Era - the time in Wisconsin history from the 1850s to the 1920s when timber was harvested at a rapid pace. Also known as the cutover. Lumberjack -
term used for individuals who worked in the woods during a logging
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