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A level Geography - Ecosystems: change and challenge COPY > Key words > Flashcards

Flashcards in Key words Deck (20)
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1
Q

Climatic climax.

A

Final plant stage of a succession.
Dynamic equilibrium.
No environmental change - no vegetation change.

2
Q

Deforestation.

A

Deliberate clearance of forest by cutting/burning.

3
Q

Plagioclimax.

A

The plant community that exists when human interference prevents the climatic climax being reached.

4
Q

Secondary succession.

A

Succession on formerly vegetated land.

5
Q

Sere.

A

An individual stage in a plant succession.

6
Q

Succession.

A

A series of changes that take place in a plant community over time.

7
Q

Biomass

A

The total mass of plant and animal life in an ecosystem.

8
Q

Biome.

A

Ecosystem at a continental scale covering a large scale area, with vegetation characteristics that are predominantly influenced by the climate.

9
Q

Ecosystem.

A

A dynamic, stable system characterised by the interaction of plants and animals with each other and with the non-living components of te ecosystem.

10
Q

Environment.

A

All the conditions in which an organism lives.

11
Q

Food chain.

A

A hierarchy of organisms in a community.

Each member feeds upon another in the chain and is eaten in turn.

12
Q

Food web.

A

When organisms within a community eat more than on to or food and food chains become interlinked, a food web is created.

13
Q

Tropic level.

A

A feeding level within a food chain. The first level is made up of vegetation or primary sources.

14
Q

Biodiversity.

A

The variety of species within an ecosystem.

15
Q

Leaching/eluviation.

A

Soluble bases are removed from a soil by downward-percolating water in environments where precipitation exceeds evaporation.

16
Q

Net primary productivity (NPP).

A

The amount of energy fixed in photosynthesis minus the energy lost by respiration in plants, measured in grammes per square metre per year (g m-2 year-1).

17
Q

Soil.

A

The outermost layer of the Earth’s crust, providing the foundation for all plant life.
It’s made up of organic, mineral and animal constituents differentiated into layers (horizons) of variable depth.
It’s created by the interaction of physical, chemical and biological processes.

18
Q

Conservation.

A

Preservation of the natural environment.

19
Q

Ecology.

A

The study of the relationships between living things and their environment.

20
Q

Sustainable development.

A

The management of resources in such a way that the ability of the system to replace itself is greater than the level of exploitation.