28.00 Describe the role of forests and their growth in the environment and society Role of Forests...
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28.00 Describe the role of forests and their growth in the environment
and society
Role of Forests in the Environment
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Forests
28.01 Describe the impact of forests, their products, and processing on our environment, economy, and society.
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ForestsA mixture of trees, shrubs, plants, and
animalsA community of sortA balanced ecosystem
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Early days…An asset
Produced wood, which was exported Game, which was used for food
Problem/EnemyMany trees had to be removed to grow crops
Plains states and Southwest were too dry to support forests.
Forestry: Keeping NC Green and Growing
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United States ForestryProduction of forests has increased though
the acreage has not risen.
Explain this?
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LimitationsTypes of trees that will grow in an area are
affected by:ClimateSoil TypeAltitude
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Forest RegionsWest CoastWesternCentral HardwoodTropicalNorthern Southern
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Forest Regions of the United States
Northern Coniferous ForestSoftwoods, between Canada and the U.S. borders
are soft and hardwoods. Region has swamps, rivers, lakes and marshes. The climate is cold, this is the largest forest in North America. Trees that dominate are evergreens and pulpwood trees. Species of importance include white spruce, Sitka spruce, black spruce, jack pine, black pine, tamarack and western hemlock
Northern Hardwoods ForestRegion reaches from Southeastern Canada to New
England to the northern Appalachian Mountains. It is populated by beech, maple, hemlock and birch trees
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Central Broad-leaved forestLocated east of the Mississippi river, a farming
region mostly owned by private entities. Wood of high quality is produced here, hardwoods such as maple, beech, hickory, oak, poplar, gum, walnut, cherry, ash, cottonwood and sycamore.
Southern ForestIn the southeast portion of the United States
(covers Delaware to Florida and Oklahoma to Texas) It is the forest with the most potential for reaching future lumber needs. Conifers are the most important trees in this forest, including Virginia, long leaf, loblolly, shortleaf and slash pines. Hardwoods included are Oak, Poplar, maple and walnut
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Bottomland Hardwoods ForestFound along the Mississippi River, contains mostly
hardwood trees, the soil is highly fertile which hardwoods such as oak, tupelo and cypress thrive in.
Pacific Coast ForestCalifornia, Oregon and Washington also the most
productive forest in the United States. Douglas Fir, Ponderosa Pine, hemlock, western red cedar, Sitka Spruce, sugar pine, and noble fir are some of the conifers found in this region. Important hardwoods are Oak, cottonwood, maple and alder
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Rocky Mountain ForestMuch less productive than the other forests in North
America. Western Pines are the trees of commercial value including western white pine, lodge pole pine and ponderosa pine. Aspen is the only hardwood grown in this area of commercial importance.
Tropical ForestLocated in Southern Texas and Florida. Major trees
in this forest are Mahogany, mangrove and Bay which are all unimportant commercially, but ecologically important.
Hawaiian ForestThe wet forest region grows ohia, boa, tree fern,
kuka, tropical ash, mamani and eucalyptus. These woods are used in the production of furniture and novelties.
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Benefits of ForestsTranspiration by trees cools the air
As much as 8o less than the surrounding areaAct as windbreaksQuieten NoiseRelease oxygen into the airConserve soil and waterProvide homes for wildlifeProvide recreation, rest, solace, and nature
study for people.
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Forest productsWOOD!Converted to:
PaperCharcoalRayonCellulosePhotographic Film
Wood FiberSimulated leatherShatterproof glassImitation vanillaArtificial hair
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Products from commercial treesNuts and fruitsOils, decorations, extractsResins, gums, turpentineMulch, tannin, drugs, oils, dyesSugar, syrupVeneer, charcoal, pitch, pine oilPoles, postsPaper, paper products, wall boardsLumber, bolts, timber, wastes, ties
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Relationship between forests and other natural resources
Forests play important roles in the water cycleAs water circulates from oceans to rivers to lakes, the forest
filters the rain as it falls and serve as storage areas. A forest regulates water flow, making it possible for fish and other animal and plant life to survive
Forests filter rain and help reduce the erosion of soilsTrees and shrubs are responsible for removing much of the
pollutant materials from the air and water run off. They also help reduce the harmful effects of excess fertilizer that enters underground water systems.
Forests and living organisms have many relationshipsAlgae, fungi, mosses, and other plants make their homes in the
forest. Forests also provide shelter, food, protection and nesting sites for many species of birds and fish. Shade provided by the forest maintains proper water temperatures for the growth and reproduction of aquatic life.
Forests and wildlife relationships greatly varyDepending on species, the wildlife in each forest region varies
due to climate and harvesting times
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SummaryAffect our climateControl erosion on our landsProvide wildlife habitatsProvide recreational areas for humans Benefit society
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Tree Anatomy
28.02 – Describe the parts of a tree and their functions.
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Parts of a TreeRoot SystemTrunk Crown
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Root SystemFunction of Roots
Anchor and support the treeTake in water and nutrients from the soilHelp to hold soil in place and improve soil
qualityStore manufactured food
Root hairs take in (absorb) water and nutrients
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TrunkFunctions
Supports the crownTransports sap (water and nutrients) to the
crown through xylem and sapwoodTransports food from crown to roots through
the phloemAnnual rings determine the age of the tree
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Mature Trunk Heartwood
Center of trunk, darker in colorSapwood
Outside the heartwood, lighter coloredTransports water and nutrients upward from the roots
CambiumSurrounds the sapwood
Inner barkKnown as phloemTransports food downward from the leaves to the roots
Outer barkProvides protection from drying to the inner bark
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CrownBranches, twigs, buds, and leaves of the
treeFunctions
Leaves are chemical factory of the treeFood production is a result of photosynthesis
CO2 + H2O + sunlight + chlorophyll = C6H12O6 + O2
Transpiration – evaporation of excess water from stomata
Food is manufactured Seeds, fruits, nuts, and berries are produced
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Common North Carolina Trees
29.01 Identify common NC trees based on physical characteristics.
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American ElmLeaves are oval,
long, curved and pointed, sharply toothed margins
Bark is dark grayCommon on
bottomlands75-100 feet,
diameter 2-5 feet
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American HollyLeaves are spiny,
wavy-edged, 2-4 inches long, dark green in color
Red berries on female trees
Bark is light gray, roughened wart-like growths
15-40 feet by 1-2 feet
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American Sycamore3-4 lobed leaves,
shallow sinuses, 4-7 inches long and broad, palmate, toothed margins
Multi-colored, mottled trunks
Fruit is a ball 1” diameter
80-110 feet by 3-8 feet
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Bald CypressLeaves are ½ to3/4
inches long and are arranged in a featherlike fashion along two sides of small branchlets
Trunk has a broad, fluted based “knee”
Bark is dark reddish brown to silver and is finely divided by longitudinal fissures
Swamplands
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Black WalnutLeaves are alternate,
12-24 inches long, 15-23 sharply oval, finely toothed, leaflets that are 2 inches long, pinnately compound
Bark is thick dark brown to black, deep fissures
Lower slopes to bottomlands
50-90 feet by 2-3 feet
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Common PersimmonLeaves are broadly
oblong, pointed, 4-6 inches long, small dark veins on the underside
Fruit is reddish purple, 1-2 inches and only on females
Bark is dark and deeply divided in to small, square plates
Not found in mountainsUsed to make
clubheads for golf clubs
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Eastern Red CedarLeaves are smooth,
dark green, 1/16 inch in length, whorls of three
Bark is light reddish-brown, think and separates into long, peeling, fibrous strips
Found all over40-50 feet by 1-2
feet
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Eastern White PineNeedles are bluish-
green, 3-5 inches, clusters of five, white line on two surfaces of each needle
Bark is smooth, greenish on young, dark gray on old
Cones are 4-8 inchesDoes best in mountains100 feet by 4 feetLargest conifer in East
U.S.
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Loblolly Pine Needs occur in clusters of
three and are 6-9 inches long
Oblong cones are 2-6 inches long, with a spine at the tip of each scale
Mature bark is thick, bright reddish to brown and is divided by shallow fissures
Coastal Plain throughout the eastern Piedmont
90-110 feet by 2-3 feet Most common and
commercially important pine
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Red MapleLeaves are 3-5 lobed,
serrated, 2-6 inches long
Samaras are reddish in color, V-shaped
Bark is smooth and light gray on young, dark gray on old
40-70 feet by 1-2 feet
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River BirchLeaves are oval,
pointed, double toothed serrated margins
Bark varies from reddish brown to cinnamon red in color and peel back tough papery layers
Found on rivers, swamps… not in high mountains
60-80 feet by 1-2 feet
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Shagbark HickoryLeaves are 8-14 inches
long with five (rarely 7) leaflets that are tapered, oval, smoth, and finely toothed
Bark is light gray that separates into thick plates a foot or more long
Tree likes damp soilHickory Nuts60-80 feet by 1-2 feet
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Southern Red Oak Irregularly shaped lobes
that are narrow and bristle tipped or pear-shaped with three rounded lobes
Leaves are dark green above and tan below, 5-9 inches long
Bark is rough light gray on young, dark gray on old
60-80 feet by 2-3 feet Higher ridges of Coastal
Plain and throughout Piedmont
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SweetgumLeaves are star
shaped, 5 deeply separated lobes
Bark is light gray, corky scales
60-80 feet by 2-3 feetGrows in swamps,
rivers, and even on drier uplands
Large, valuable forest tree
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White OakLeaves are 5-9 inches,
7-9 rounded lobesAcorn is ¾ inche long
and chestnut brown when mature
Thin bark is light gray and covered in loose scales on broad plates
Abundant in the Piedmont and lower mountains, found in Coastal Plains
80-100 feet by 3-4 feet
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Yellow PoplarTulip tree, composed of
four large lobes, 5-6 inches long
Bark is light grayFlowers are tulip-like90-110 feet by 2-5 feetGrows best in deep
moist soils of streams and lower mountains
Greenish yellow heartwood
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Measuring the Forest
29.02 Apply tree measurement techniques and skills that are used by professional foresters.
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Board footStandard unit of measurement for lumberSold in board feetDefinition
Piece of rough wood one foot long, one foot wide, and one inch thick
Volume is equal to 144 cubic inchesFormula
Length (feet) x width (inches) x thickness (inches) 12
Length x width x thickness (all in inches) 144
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Cubic footAnother unit of measureEqual to the amount of wood needed to fill
a space one foot wide, one foot thick, and one foot high
FormulaLength x width x thickness (inches) 1728
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CordWas a common measure for pulpwoodCommon now for firewoodDefined as a stack of wood 4 feet x 4 feet x
8 feetFormula for computing cords in a stack of
woodLength x width x height (all in feet) 128
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Gross weight Actual weight of the woodEasy to use for selling pulpwoodEnsures the buyer fresh wood because
green wood is heavier, having more water.
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Measuring Tree DiameterVolume is determined by its diameter and
lengthMeasured at DBH (diameter at breast
height)Thickness across the truck at 4.5’ above the
ground. Recorded in 2” increments and rounded to
nearest inch10.9 inch = 10 inches11.1 inch = 12 inches
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Measuring Tree DiameterDendrometers
Biltmore stickLeast accurateCommon and quick to useHeld at 25 inches from one eye against the tree at
DBH
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Measuring Tree DiameterTree Calipers
One side of caliper is placed against the treeOther side is placed on the other side of the
treeMeasurement is read from caliper.
Diameter TapeTape is wrapped around the trunk at 4.5’Read directly.
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Measuring Tree Height Only includes the USABLE length of trunkSawtimber
Expressed in 16 foot logs, called merchantable logs
Sometimes, 8 or 32 feet lengths may be used.
Measured From height of the stump to where the cutoff
diameter is either:6-8 inches for sawtimber4 inches for pulpwood
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Measuring Tree Height Hypsometer
Biltmore Stick – most common, older, and least expensive
Abney LevelHager altimeterSuunto clinometer
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Using the Biltmore StickLocate log scale, or Merritt Scale, on the
stickStep away 66 feet from treeHold stick 25 inches from the eyeLine up base of stick with stump height of
treeWithout moving the stick or your head,
sight upward along the trunk to estimate cutoff diameter point
Read the number from the scale.
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Estimating Timber Volume Need to know to estimate board feet or
pulpwood volume DBHSmall-end diameterNumber of logs or bolts
Rules or Tables usedDoyle’s RuleScribners ruleInternational rule
More complexMore accurateUsed in CDE
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Estimating standing timber volume
Measuring and calculating come togetherForester must be able to make an accurate
estimation of the volume of wood in a stand of timber
CruisingCould be done by estimating each individual tree
selected for useGenerally done by using a sampling of trees.
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Forest Management Techniques
29.03 Describe cutting and reproducing techniques used in the forestry industry to improve forest quality
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Intermediate CuttingsCuttings made between reproduction and
harvest in a forestDifferent types depending on:
ClimateTree Species Owner/manager objectives
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ThinningWhen only some of
the trees in the stand are removed
Reduces the competition for essential needs from other trees
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LiberationRemoval of the
taller, dominant trees from a stand
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SanitationCutting that
removes the injured, diseased, or insect-infested trees from the stand
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SalvageCutting that
involves removal of trees that are dead or damaged by storms, construction, etc.
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RemovalRemoval of
undesirable trees involves removing trees that could be compared to weedsForked treesCrooked trunksPine trees in a
hardwood stand
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Prescription BurningControlled burning
of the undergrowth in a forest
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Harvest CuttingsSelective CuttingShelterwood CuttingSeed-tree CuttingCoppice CuttingClear Cutting
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Selective CuttingIndividual trees are
selected for harvest based on maturity, size, species, etc.
Goals are to produce an income and a better timber yield
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Shelterwood CuttingHarvesting a
mature forest in two or three stages
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Seed-tree CuttingThe entire stand is
removed except for a few of the best trees that are left to produce seeds
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Coppice CuttingSimilar to seed-tree
cuttingRather than
remaining trees providing seed, the remaining trees develop root suckers to produce new trees
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Clear CuttingAll the trees in a
stand are harvested at one time
Most economical and most controversial
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Reproducing the ForestNatural SeedingDirect SeedingCuttingsPlant Seedlings
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Natural SeedingAllowing trees to
naturally reseed to produce new growth
EconomicalLeast amount of
control by the forest manager
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Direct SeedingApplying tree seeds
directly to the desired area
Can be done by:HandSeed spreadersGrain drillsAircraft
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CuttingsCuttings can be
taken from existing trees, allowed to root, and then planted
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Plant SeedlingsPlanting a nursery-
produced seedlingMore labor and
expensiveAllows complete
control over reproduction
Tends to get results quickly
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Plant Seedling ContinuedSome states offer
government rebates to landowners who reforest their land after harvest
The most certain and quickest way to reproduce trees