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Ecosystem structure

作者:无锡市北高中 来源:无锡市北高中 发布时间:2009年10月23日 点击数:

Teaching aims:

1.To give examples of ecosystem structure.

2.To Discussing the structure of ecosystem.

3.To construct the model of ecosystem structure.

Leading-in:

Show some pictures of ecosystem about oceans, grasslands, forest and wetlands.

Concept of ecosystem:

1.Concept:An ecological community together with its environment, functioning as a unit.

2.Range: spacial scale about ecosystem can be large or small. A pound, a mass of grassland, a forest ,even a drop can form an ecosystem.

 

All living things and inorganic environment on the earth compose the largest ecosystem,which is biosphere.

 

          Aquatic ecosystem:ocean,fresh water lake

          Terrestrial ecosystem:grassland, forest,desert and wetland.

Ecosystem  structure:

Substance and energy of non-living matters

   sunlight ,heat energy,water ,air,salt..

Producer : autotrophic organism, mainly green plant

(3)Consumer: animals and parasitic bacteria

(4)Decomposer : mainly bacteria and fungus

 

 

Compositions

 

Objects

Functions

Nutritional types

 

Substance and energy of non-living matters

sunlight ,heat energy,water ,air,salt...

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Producer

mainly green plants

changing the sun's energy into chemical energy

autotrophic organism

 

Consumer

Animals and parasitic bacteria

increasing the speed of circulation of substances;

helping plants pollination and seed dispersal

heterotrophic organisms

 

Decomposer

bacteria and fungus

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Breakdown or decay of organic materials

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heterotrophic organisms

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model construction

trophic structure

green plants        grasshopper        frog        snake

Producer: A photosynthetic green plant or chemosynthetic bacterium, constituting the first trophic level in a food chain.

primary consumer:exist on plants belong to second trophic level.

secondary consumer:belong to third trophic level.

tertiary consumer:belong to fourth trophic level.

Fourthly consumer:belong to sixth trophic level.

 

①how many food chains are there?

②which  organisms belong to second trophic level?

③fox belong to which trophic level?

④what is the relationship between eagles and snake? predation

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