Upload
xanthus-adkins
View
38
Download
3
Embed Size (px)
DESCRIPTION
Forestry & Society Definitions & Tools. HORT / RGSC 302 J.G. Mexal Fall 2006. Forestry & Society Definitions & Tools. Tree : a woody perennial at least 10 ft tall, usually with one main stem. Conifer: cone bearing plant, usually evergreen and softwood - PowerPoint PPT Presentation
Citation preview
Forestry & Society
Definitions & Tools
HORT / RGSC 302
J.G. Mexal
Fall 2006
Forestry & Society
Definitions & Tools• Tree: a woody perennial at least 10 ft tall, usually
with one main stem.– Conifer: cone bearing plant, usually evergreen and
softwood• e.g. pine, Douglas-fir, spruce, juniper
– Broadleaf: usually deciduous trees and hardwood• oak, walnut, ash, cottonwood, balsa
– Monocots: some monocots are classified at trees; • e.g. palm trees, Joshua tree, bamboo
Forestry & Society
Definitions & Tools• Log: harvested tree
– 16 ft for softwood (also called ‘bolt’)
– 12 ft for hardwood (also called ‘bolt’)
• Butt log: first log, 25-33% of value of tree. Used for plywood or dimension lumber Butt log
Log 3
Log 2
Log 4
Forestry & Society
Definitions & Tools• D.B.H. Diameter breast height; measured
at 4.5 ft (1.35 m) above ground on standing tree.
• Height: merchantable height measured to 2” or 4” top; using a clinometer.
• DIB = Diameter Inside Bark
• Annual Increment = one growth ring DBH
DIB
Forestry & Society
Definitions & Tools
Forestry & SocietyDefinitions & Tools- ’D’ Tape
English
Metric
Forestry & SocietyDefinitions & Tools- Clinometer
Forestry & SocietyDefinitions & Tools- Logger’s Tape
(English units)
Forestry & SocietyDefinitions & Tools-GPS Navigator
Precision + 30’
Forestry & Society
Definitions & Tools• Cord: volumetric measure for pulpwood or
firewood, equal to 128 cu. ft. (4 ft x 4 ft x 8 ft) loosely stacked, or 90 cu. ft. solid wood and bark.– 1 cord = 0.495 MBF Doyle scale– 1 cord ~ 2 tons– 1 cord ~ 2,700 copies of daily newspaper
Forestry & Society
Definitions & Tools-- Cord
0
0.2
0.4
0.6
0.8
1
1.2
0 5 10 15 20 25
203040506070
DBH (in)
Firewood Cords
Height (ft)
Flinchum / For.Source 9(12):12:’04)
Forestry & SocietyDefinitions & Tools-Biltmore Sticks
Forestry & SocietyTools-So. Pine Infomation Stick
Forestry & Society
Definitions & Tools• Board Foot: volumetric measure of lumber
or logs that will be milled into lumber = 1 ft long x 1 ft wide x 1 in thick
• MBF: one thousand board feet
• MCF: one thousand cubic feet
Forestry & Society
Definitions & Tools
Volumes Scales
• Doyle : bd ft = ((D -- 4)/4)2 x L– used in East & South
• Scribner : bd ft = ((0.79D2 --2D --4) x L)/16– used by USFS
• International: bd ft = 0.796D2 --1.357D --1.230
• Doyle calculation• Tree = 20” DBH, 80’H
• bd ft = ((D -- 4)/4)2 x L
= ((20-4)/4)2 x 80
= ((16/4)2 x 80
= (4)2 x 80
= 16 x 80
= 1,280
Forestry & Society
Definitions & Tools
• Doyle calculation• Tree = 20” DBH, 80’H
• bd ft = ((D -- 4)/4)2 x L
= ((20-4)/4)2 x 80
= ((16/4)2 x 80
= (4)2 x 80
= 16 x 80
= 1,280
• Scribner calculation• Tree = 20” DBH, 80’H• bd ft = ((0.79D2 --2D --4) x L)/16
= ((0.79x202 – 2x20 -4) x 80)/16
= ((0.79x400 -40 -4) x 80)/16
= ((316 – 44) x 80)/16
= (272 x 80)/16
= 21,760/16
= 1,360 (106%)
Forestry & Society
Definitions & Tools
Forestry & Society
Definitions & Tools-- Cord
0
0.2
0.4
0.6
0.8
1
1.2
0 5 10 15 20 25
203040506070
DBH (in)
Firewood Cords
Height (ft)
Flinchum / For.Source 9(12):12:’04)
Forestry & Society
Definitions & Tools
0
100
200
300
400
500
30 40 50 60 70 80 90 100
6 in 8 in10 in 12 in14 in 16 in18 in
Tree Height (ft)
Volume (bd ft)
DBH
Forestry & SocietyForest Measurements/
Forestry Handbook 1984
0
100
200
300
400
500
600
700
0 5 10 15 20 25 30
DoyleScribnerInternational 1/4
Diameter of 16 ft log
Board Feet
Forestry & Society
Definitions & Tools/ Farm Bull. #2102, 1956
0
200
400
600
800
1000
0 0.25 0.5 0.75 1 1.25 1.5
60 ft70 ft80 ft90 ft100 ft
Board Feet
Volume (cords)
Forestry & Society
Piece Size vs Value/Barbour, USFS-1999
0
10
20
30
40
50
0 2 4 6 8 10 12 14 16
8 foot log small end diameter (in)
Value/log ($)
veneer
lumber
pulpfuel
Forestry & Society
Definitions & Tools• Basal Area: cross-sectional area of tree
stems at a standard height (usually DBH);
• Stand Basal Area: total values on a per unit area. Attribute widely used in stocking and thinning prescriptions.
Forestry & Society
Definitions & Tools• Current Annual Increment: Growth rate per year
at a specified point in time.– Vol./ Area/ Time
• Mean Annual Increment: Size divided by age.– Includes standing volume + removals
• Periodic Annual Increment: Average growth rate up to a specified point in time. Vol. / Time
Forestry & Society
Site Index (SI50)/Wenger 1984
0
20
40
60
80
100
120
140
160
180
0 20 40 60 80 100
SI 60
SI 80
SI 100
SI 120
Years
Height (ft)Loblolly pine
0
20
40
60
80
100
120
140
160
180
0 20 40 60 80 100
SI 60
SI 80
SI 100
SI 120
Douglas-fir in WA
Forestry & Society
Site Index (SI50)/Wenger 1984
0
20
40
60
80
100
120
140
160
180
0 20 40 60 80 100
SI 40SI 60SI 80SI 100SI 40SI 80SI 120
Years
Height (ft) Ponderosa pine in CA
SI50SI100
0
20
40
60
80
100
120
140
160
180
0 20 40 60 80 100
SI 60SI 80SI 100SI 120
Years
Height (ft) Douglas-fir in WA
Forestry & Society
Ponderosa Pine Site Index (SI100)/Wenger 1984
0
10000
20000
30000
40000
50000
60000
70000
80000
40 50 60 70 80 90 100 110 120 130
0
5
10
15
20
25
BA (ft2)
Vol. (ft3)
Vol. BF
DBH (in)
Site Index (SI 100)
BA (ft2) or DBH (in)Volume (BF or ft3)
Forestry & SocietySilviculture/ Stocking
Lincoln National Forest
Mescalero Apache Indian ReservationSue Nichols
Sue Nichols
Forestry & SocietySilviculture/ Stocking
Lincoln National Forest
Mescalero Apache Indian Reservation
Forestry & Society
Definitions & Tools--
• Things to Know– Tree, DBH, DIB, log, clinometer, conifer,
annual ring, heartwood, sapwood, evergreen, deciduous, hardwood, cord, MBF, silviculture, stocking, site index, basal area (BA), board foot, Biltmore stick, stocking, current, mean, periodic annual increment
– Doyle, Scribner calculations (how to do)
Definitions• Advance regeneration: small trees that appear before any silvicultural practice is undertaken to
establish new growth.• Age class: a distinct aggregation of trees of more or less similar age originating from a single natural
disturbance or regeneration cutting.• Angiosperm: member of the class Angiospermae, including flowering plants with ovules (seeds)
enclosed in an ovary (fruit). Members include oak, pecan, aspen, cottonwood, mahogany, and also referred to as ‘hardwoods’.
• Basal area: the cross-sectional area of tree stems at a standard height (usually 4.5 ft); the total of such values on a per unit area basis (= stand basal area) is a stand attribute widely used in stocking and thinning guides.
• Biome: an extensive community of plants and animals determined by soils and climate; an ecosystem.• CAI: current annual increment. Growth rate per year at a specified point in time.• Clearcutting method: a method of regeneration an even-aged stand in which a new age class develops
in a fully exposed microclimate after removal, in a single cutting, of all trees in the previous stand. Regeneration may be from natural seeding, direct seeding, planted seedlings, or advance reproduction. Harvesting may be done in groups or patches (group or patch clearcutting) on in strips (Strip clearcutting). In the clearcutting system, the management unit or stand consists of the individual clearcut stand.
Definitions• Clone: a group of individuals of identical genotype, usually arising from vegetative
propagation.• Commercial thinning: a thinning in which the trees removed have value at least equal to the
cost of harvest.• Conifer: a cone bearing plant. Member of the class Gymnospermae. Also, called softwood
species.• Conservation Reserve Program (CRP): a federal program to convert highly erodible crop
land to trees, grass or wildlife habitat through incentives that include cost sharing and annual payments, usually over a 10-year period.
• Board foot: a volumetric measure of lumber or logs that will be milled into lumber = 1 ft long x 1 ft wide x 1 in thick.
• Cord: unit of volumetric measure for pulpwood, equal to 128 cu. ft loosely stacked or 90 solid cu. ft of wood and bark. One cord equals 0.495 MBF Doyle scale. One cord of hardwood equals about 2 tons or 1,000 to 2,000 lb paper or 2,700 copies of a daily newspaper.
• D.B.H.: diameter breast height, diameter of a standing tree, measured at 4.5 ft (1.35 m) above ground.
Definitions
• Density: number of individuals per unit area (ecology); any measure expressing degree of competition (forestry).
• Doyle scale: volumetric scaling rule for log purchase calculated by the formula:
• bd ft = ((D-4)/4)2 x L,
• where D = log diameter in inches, and L is log length in feet. This scale gives an approximate indication of the number of lumber board feet that can be sawed from a roughly cylindrical log.
• Ecology: the study of relations between plants and animals and their environment.
• Ecosystem: a distinguishable community of plants and animals interacting with the physical factors of its environment.
• Even-aged stand: a stand of trees containing a single age class.
• Forest: an area supporting trees, ordinarily including multiple ages, species, and conditions.
Definitions• Forest management: the practical application of scientific, economic, and social
principles to the administration and working of a forest property for specified objectives.
• Forestry Incentives Program (FIP): a federal cost-sharing program for approved forest management practices such as site preparation, planting and timber stand improvement. Private owners of at least 10 acres but normally no more than a total of 1,000 acres of eligible forest land may apply. The total cost share payments cannot exceed $10,000 annually but are usually much less.
• Genotype: the genetic composition of an individual organism.
• Group selection method: a method of regenerating uneven-aged stands in which trees are removed and new age classes established in small groups. Maximum width of groups is approximately twice the height of mature trees. The management unit or stand in which regeneration, growth, and yield are regulated is an aggregation of such groups.
• Gymnosperm: member of the class Gymnospermae; seed plants with ovules (seeds) borne on open scales of cones. Examples include pines, spruces, junipers, ginkgo, and collectively referred to as softwoods.
Definitions• Intolerant: lacking the ability to grow in shade of or in competition with other and
taller plants.• Lumber grades: based on number of defects and overall quality, in decreasing order
of quality, lumber grades are: FAS- first and seconds, 1F, one face clear, 1C- one common, 2C- two common, 3A- grade 3, BG- below grade, not graded for quality.
• MAI: mean annual increment is the average growth rate of a stand up to a specified point in time. Calculated as the sum of present volume plus volume of any thinnings, divided by age.
• MBF: one thousand board feet.• MCF: one thousand cubic feet.• Natural regeneration method: a method of establishing forest stands in which the
trees grow from natural seedfall or sprouting.• Nonindustrial private landowner: private landowners who hold timber as an
investment or as part of a larger privately help business such as a farm.
Definitions• Old growth: a stage in stand development characterized by advanced age, large
trees, layered structure, and abundant woody debris. Usually applied to stands that have had no human intervention.
• PAI: periodic annual increment is an approximation to current annual increment (most commonly in volume), calculated as the difference between measurements at two points in time, divided by number of years between the two measurements.
• Peelers: logs designated for conversion into plywood.• Post-consumer recovered paper: newspapers, cardboard, magazines, office paper.• Precommercial thinning: an early thinning removing trees too small to have
commercial value, usually done to improve spacing; also referred to as ‘respacing’.• Pre-consumer recovered paper: trimmings and scraps recovered before reaching
the consumer.• Pulpwood: roundwood greater than 4” in diameter on the small end, cut into
lengths of 5 ft 6 in; used in the manufacture of pulp and paper products.
Definitions• Rain Forest: Evergreen forest (conifer or angiosperm) with high rainfall and little or no
dry period.• Regeneration: newly established plants (synonym = reproduction), or the process by
which new plants are established.• Rotation: one cycle of a forest stand from planting until final harvest.• Roundwood: round logs or tree sections harvested for use in the forest products industry.• Sawlogs: logs greater than 12 in (small end diameter) designated for processing in a
sawmill.• Second growth: the forest that replaced the virgin forests that once covered the region.
In some regions of the SE US, the second growth has been cut, and the third or even fourth forest is in the process of being harvested.
• Seed-tree method: an even-aged regeneration method in which a new age class develops from seedlings that germinate in fully exposed microenvironments after removal of all the previous stand except a small number of trees left to provide seed. Seed trees are removed after regeneration is established.
Definitions• Selection method: a collective term for the single tree selection and group selection
methods. A silvicultural system involving removal of individual trees (single tree) or scattered groups (group) of trees at frequent intervals, leading to an uneven-aged condition.
• Selective cutting: a loose term for any form of cutting that removes only part of a stand. Often incorrectly used as a synonym for selection system. Undesirable term because of confusion introduced by past use of the term for destructive high-grading practices.
• Shelterwood method: a method of regenerating an even-aged stand in which a new age class develops beneath the partially shaded micorenvironment provided by the residual trees (overstory). Harvesting may be done uniformly throughout the stand, in groups or patches, or in strips. The overstory is removed once the regeneration is established.
• Silvicultural system: a planned program of silvicultural treatment over the live of a stand, extending from regeneration through intermediate operations to harvest and regeneration.
• Silviculture: the body of techniques used to manipulate stand environments and direct stand and tree development to create or maintain desired conditions.
Definitions• Single-tree selection: method: a method of creating new age classes in uneven-aged
stands in which individual trees of all size classes are removed more or less uniformly throughout the stand to achieve desired stand structural characteristics.
• Site Index: a measure of forest site quality (i.e., the actual or potential productivity of a site) based on the height of dominant trees at a specified age
• Site preparation: a collective term for various measures that can be taken to alleviate conditions unfavorable to prompt and adequate regeneration.
• Slash: the residue of tops, branches, and other unused material left on the ground after harvest.
• Stand: a contiguous group of trees sufficiently uniform in age class distribution, composition, and structure, and growing on a site of sufficiently uniform quality, to be a distinguishable unit.
• Stand management: the practical application of scientific and economic knowledge through silvicultural measures designed to direct development of a stand toward desired objectives.
• Stocking density: a measure of the total number of trees per unit area.
Definitions
• Sustainable level: the level or rate of production or economic expansion that can be maintained without causing instability to occur in markets or production processes.
• Stumpage: a collective term for the trees standing in the forest before harvest.
• Stumpage price: the price received for trees standing in the forest. The price is usually broken out by product class.
• Thinning: removal of a portion of trees in a stand to promote development of the remaining trees and vegetation and to secure income prior to final harvest, while retaining the even-aged character of the stand.
• Tolerant: having the ability to become established and grow under shade of or in competition with taller plants.
• Tree: a woody perennial at least 10 ft tall, usually with one main stem.
• Veneer: thin sheets of wood peeled from peeler logs used in the manufacture of plywood.
Forestry & Society
Definitions & Tools--Conversions
• English– 2.47 acre
– 2.2 lb
– 0.28 cord
– 28.3 cu ft
– 1.12 lb/ac
• Metric– ha
– kg
– m3
– m3
– kg/ha
Forestry & Society
Definitions & Tools--Conversions
• English– acre
– lb
– cord
– cu ft
– lb/ac
• Metric– 0.4 ha
– 0.454 kg
– 3.6 m3
– 0.028 m3
– 0.9 kg/ha
Forestry & SocietyForest Measurements/wood weights
Forestry Handbook 1984
0
2000
4000
6000
8000
10000
12000
14000
Longleafpine
Shortleafpine
White ash Sugar maple Yellow birch
Green cord wt (lbs) ODW cord wt 1 MBF green wt
Pounds
Clinometer conversions/Jan’02
0
4
8
12
16
20
0 20 40 60 80 100 120
meters
Percent(%)
Meters (m)