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DBH - an acronym for diameter at breast height. Foresters measure diameter at breast height or 4.5 feet from the ground. Deciduous - shedding leaves annually or at a particular stage of growth. Deciduous Forest - a type of forest containing trees that shed their leaves annually. Decline - the part of a trees life when it becomes less healthy and does not recover. Decompose - a process whereby dead plants and animals are broken into nutrients and minerals by decomposing organisms, heat, water, and wind. Decomposer - an organism that gets its food energy from dead parts of other organisms; an important part of the energy cycle and food webs. Defoliate - the removal of leaves off a tree. Diameter at Breast Height (DBH) - the diameter of a tree 4.5 feet above ground level. Diameter Tape -a type of measuring tape specially graduated so that diameter can be read when the tape is wrapped around a tree (circumference) without extra calculations. Dicotyledon - one of the two classes of angiosperms; a plant whose embryo has two seed leaves. Disease - an abnormal condition in a plant that affects the health, longevity, or economic value. Disturbance - an event, either natural or by human-induced, that causes a change in the growth or existing condition of a forest. Dominant - trees with crowns extending higher than other trees in the same stand. They receive full sunlight from above and partly from the sides. Driftless Area - the area of Wisconsin never covered by glaciers. Located in southwest area of the state, also includes parts of MN, IA, and IL. Duff Layer -layer of the forest containing
partially decomposed organic material. Found beneath the litter layer on
the forest floor. |