1 4.6 Utilization of Forest Resources By Lester Green Smallwood Academy Gambo.

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4.6 Utilization of Forest Resources

By Lester Green Smallwood Academy Gambo

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4.6.1 Compare the terms clear-cutting and selective cutting.

Clear-cutting Harvesting of all

timber and unwanted species.

It leaves only stumps and rubbish on the ground.

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4.6.1 Continued…Selective cutting Harvesting of

selected trees individual or small groups of mature trees are cut, leaving most of forest intact.

Often carried out in deciduous forest or mixed species and age.

4.6.1 continued…

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4.6.2 Compare the advantages and disadvantages of each approach.

Clear-cutting:

Advantages Most rapid method Most economical Least dangerous

Clear-cutting:

Disadvantages Trees

removed/burned Ecosystem struggles

to recover Habitat destroyed Soil more easily

eroded

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4.6.2 Compare the advantages and disadvantages of each approach.

Selective Cutting

Advantages Younger trees grow

to maturity Far less ecological

disruptive

Selective Cutting

Disadvantages Yields are lower More expensive Access roads must

be maintained

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4.6.3 Major threats to forest resources.Deforestation (see #7 p. 163)

agricultural land

housing needs

mineral deposits

hydro-electric development

4.6.3 continued…Forest Fires Insects (spruce

budworm, hemlock looper)

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4.6.4 Examine strategies for a sustainable forestryLimiting clear-cut plotsSkyline Yarding system (case study p.

166)Use of HelicoptersReseeding/ better refrigeration for seedsLimit number of trees per hectareSecondary processing to increase

employment

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4.6.5 Evaluate a position taken on a given argument about timber harvesting.

See question # 11, p. 169Case Study: Clearcutting Controversy

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4.6.6 Infer a relationship between climate and the extent of forest cover. Tundra region to cold with frozen soil and small

amounts of precipitation Desert regions to hot and small amounts of

precipitation Grassland regions not enough precipitation to

support any amount of tree growth

Percentage of forest cover fig 10.1, p. 162

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4.6.6 continued… Three regions with forest cover1. Boreal Forest Region Cold, moist climatic region

with short growing season.

Evergreen coniferous (needle-leaf) such as spruce, fir, pine, etc..

Location…across North America and Eurasia

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4.6.6 continued… Three regions with forest cover2. Deciduous Forest

Region Temperate climatic area

with cool and moist conditions.

Loose leafs during winter months

Broadleaf trees…examples oak, maple, birch, etc.

Location…W Canada, W & S USA, W Europe, SE Asia

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4.6.6 continued… Three regions with forest cover3. Tropical Rainforest

Regions Equatorial region with hot

and moist climatic conditions

Evergreen broadleaf such as teak, mahogany

Location…NE South America, India, SE Asia, Indonesia, Africa, etc. (tropical regions)

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4.6.7 Analyze global patterns in the depletion of forest resourcesSee fig 10.2, p. 164