Definitions for

**"Basal area"****Related Terms:**Stocking, Stand density, Lai, Cross-sectional area, Dripline, Leaf area index, Hectare, Acre, Square mile, Diameter at breast height, Hammock, Dbh, Subalpine, Dominant, Area, Canopy closure, Cover, Montane, Population density, Growing stock, Prairie, Timberline, Mallee, Quarter section, Stocking density, Zone, Trees, Breast height, Forest land, Woodland, Forested wetland, Alpine, Forest, Square, Co-dominant, Merchantable height, Square foot, Root collar, Drip line, Plain, Stand, Krummholz, Tree, D.b.h, Square yard, Tundra, Square footage, Moor, Pollarding

The area of a given unit of land, such as a ha or ac, that is occupied by the cross-sectional area of tree boles measured at breast height. Usually expressed as square feet per ac or square meters per ha.

A measure of the cross-sectional area taken up by trees at 4.5 feet above ground level.

1. The cross?sectional area of the bole of a tree, 41/2 ft above the ground. Basal area = diameter of tree squared, times .005454. 2. The sum of all the individual tree basal areas for a given land area. Commonly expressed as sq ft of basal area (a well?stocked, 40?year?old Douglas?fir forest may have 200?250 sq ft of basal area).

(1) The area in square feet of the cross section of a tree including bark, at 4.5 feet above the ground. A tree 14 DBH is approximately 1 square foot. Generally expressed as the total of all trees, thus total Basal Area per acre. Measurement of how much of a site is occupied by trees e.g., 90-100 square feet per acre. (2) In range management, it is the area of ground surface occupied by the stem(s) of a range plant, as contrasted with the full spread of its herbage or foliage, generally measured at one inch above soil level.

The area of the cross-section of a stem at breast-height. When applied to a crop ("crop basal area"), the sum of basal areas of all the stems or the total basal area per unit of area. Abbr.. b.a.

The area of the cross-section of a stem at breast height (1.3Â m above ground level). The basal area of a wood is the sum of the basal areas of the trees composing it.

Basal area is the cross-sectional area of a tree at breast height measured over bark. It is measured in m². The stand basal area is the total of the basal areas of all the trees over 10 cm DBHOB in the stand. It is measured in m² per hectare.

the area in square feet of the cross section at breast height of a single tree, a group of trees, or all of the trees in a stand, usually expressed in square feet per acre.

The cross-sectional area of a tree taken at the "base" of the tree (i.e., measured at 4.5 feet above the ground). Basal area is often used to measure and describe the density of trees within an geographic area using an estimate of the sum of the basal area of all trees cross-sectional expressed per unit of land area (e.g., basal area per acre).

Terms Commonly used in Management Plans] [ Forest Stewardship] A forest measurement used to indicate stand stocking. For example, a well stocked pine stand might contain 80 to 120 square feet of basal area per acre.

the cross-sectional area of the trunk 4 1/2 feet above the ground; (per acre) the sum of the basal areas of the trees on an acre; used as a measure of forest density.

Cross sectional area of a tree, in square feet, measured at breast height. Used as a method of measuring the volume of timber in a given stand

The cross-sectional area of a tree trunk measured in square inches, square centimetres, etc. Basal area is normally measured at 4.5 ft above the ground level and is used as a measure of dominance. The most easily used tool for measuring basal area is a tape marked in square inches. When plotless methods are used, an angle gauge or prism will provide a means for rapidly determining basal area. This term is also applicable to the cross-sectional area of a clumped herbaceous plant, measured at 1.0 in. above the soil surface.

The cross-sectional area of a tree trunk at breast height - 4.5 feet above the ground surface Usually expressed in square feet. When summed for all of the trees on an acre. Basal Area is an expression of density.

Forestry term used to refer to the density of a stand of trees, expressed in square feet/acre.

The cross sectional area of a tree, in square feet, measured at breast height. This is one method of measuring density in a given timber stand.

The cross-sectional area of all stems of a species or all stems in a stand measured at breast height (4.5 ft. or 1.37 m. above the ground) and expressed per unit area of land (e.g., 25 sq. ft. per acre).

the cross-sectional area of the trunk 4 1/2 feet above the ground; most commonly used as an indicator of stand density and expressed as square feet per acre. A tree with a 14" diameter has a basal area of just over one square foot.

The cross-sectional area of the tree's trunk at breast height; stand basal area is the sum of tree basal area for the community

The cross sectional area of the stem or stems of a plant or of all plants in a stand. Herbaceous and small woody plants are measured at or near the ground level; larger woody plants are measured at breast or other designated height. Syn. Basal cover.

The cross-sectional area 41/2 feet above ground expressed in square feet per acre of all trees with a diameter of 5 inches and larger.

The area of the cross-section of a tree stem near its base, generally at breast height, inclusive of bark. Expressed in square feet per acre.

The sum of areas of the stem cross sections taken at Breast Height (1.4m above ground level) of all the trees growing on one hectare.

a measurement of the cross-sectional area of a tree trunk in square feet at breast height. Basal area if a forest stand is the sum of the individual trees, and is reported as BA per acre.

(BA): the cross-sectional area of a single stem, including the bark, measured at breast height (4.5 ft or 1.37 m above the ground)

The sum of the cross-sectional areas measured at breast height (1.3m from the ground) of the trees in a given stand. Usually expressed as square metres per hectare (m2/ha). Forestry Victoria

The cross sectional area of the base of any object. In forestry it means the cross sectional area of a tree at a point 4.5 feet above the ground line expressed in square feet. The sum of all the basal areas of all the trees on an acre is a measure of the density of the population of trees growing on the acre and is useful for making forest management decisions. A helpful way to think of basal area is to imagine all the trees on an acre cut off with 4.5 foot stumps. Basal area on the acre could then be measured by measuring and totaling the cross sectional area of all the stumps. Fortunately, it is not necessary to cut trees to measure basal area. It can be calculated from tree diameter or can be easily measured with an angle gauge when certain relationships are known. Basal area will commonly range from 20 to 70 square feet per acre for poorly stocked stands to more than 200 square feet per acre for dense stands of conifers.

The area in square feet of the cross-section of tree trunks at 4.5' up from the base of the tree. This is often used as a measurement of relative density and is used in area/acre terms. If I were to say 90 square feet basal area of red oak in a stand, that means that if you cut the trees at 4.5' high, and calculated the surface area of each of the stumps in one acre of the stand and added them all together it would equal 90 square feet of surface area. Keep in mind though, that this measurement is extremely variable within a stand. Usually, foresters measure density with an angle device, and often talk about B.A. in 10s of square feet; 60,70,80, etc. It is not a very precise measurement, but works well for the mangement of forests.

The area of the cross section of a tree stem including the bark, near its base, generally at breast height, or 4.5 feet above the ground. ( FEMAT, IX-3). Basal area is a way to measure how much of a site is occupied by trees. The term basal area is often used to describe the collective basal area of trees per acre. ( FS People's Glossary of Eco Mgmt Terms)

Of a tree: the cross-sectional area (in square feet) of the trunk at breast height (4.2 feet above the ground). For example, the basal area of a tree 14 inches in diameter at breast height is about 1 square foot. Basal area = 0.005454 times diameter squared. Of an acre of forest: the sum of basal areas of the individual trees on the area. For example, a well stocked pine stand might contain 80 to 120 square feet of basal area per acre.

Basal area is the term used in forest management that defines the area of a given section of land that is occupied by the cross-section of tree trunks and stems at their base.

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