forests and fisheries science 11.3. standard s 6.6b students know different natural energy and...
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Standard S 6.6b Students know
different natural energy and material resources, including air, soil, rocks, fresh water and forests and know how to classify them as renewable or nonrenewable
Language of the Discipline Renewable resourceClear cuttingSelective cuttingSustainable yieldFishery aquaculture
Renewable resource Always available or is naturally replaced
in a relatively short time
Non-renewable- it cannot be replaced or is not always available
Forest Resources Valuable resources
Frusits Seeds Maple syrup Rubber Nuts Lumber Wood pulp for making paper
All required to be cut down
Coniferous (pine and spruce) Construction and for making paper
Hardwoods Ash, Cherry, Maple
Furniture because of strength and beauty Trees help prevent flooding and control soil
erosion Roots absorb rainwater and hold soil in place
Managing Forests 300 million hectares of forests New trees can be planted to replace
trees that are cut down, forests can be renewable resources
People are trying to maintain forests and to conserve them.
Logging Methods
Clear cutting- cutting down trees in an area at once Quicker, cheaper, safer for loggers, ecosystem
changes and soil is exposed Selective cutting- cutting down only some trees
in a forest and leaving a mix of tree sizes and species behind. Move heavy equipment and logs around
remaining trees, less damaging
Sustainable Forestry Sustainable yield is an amount of a
renewable resource such as trees that an be harvested equally without reducing the future supply
Planting a tree to replace one that was cut down
Trees must be planted enough to keep a constant supply
Harvest different sections at a time
Fisheries An area of ocean with many valuable
ocean organisms Managing fisheries
Fishing limits Hanging fishing methods Developing aquaculture techniques Finding new resources
Fishing Limits Laws
Ban fishing certain species Limit the number or size of a fish Require that fish be within a certain range
of sizes Young fish survive long enough to
reproduce
Fishing Methods/ Aquaculture
Nets to allow small young fish to escape Outlawed methods
Poisoning with cyanide Stunning them with dynamite
Aquaculture Raising fish and other water dwelling organisms for
food Salmon, catfish, shrimp in artificial ponds or bays
New Resources 9,000 different fish species are
harvested for food Fish for new species Scientist and chefs are trying to
introduce people to keep water species such as monkfish and tile fish and tilapia.
Checking for Understanding What is aquaculture What is sustainable yield? What is renewable resource? What is a nonrenewable resource?