Case Studies: Eutrophication and Saliniaztion

Question 1

Where was Eutrophication an issue?

Answer 1

Kunming City, China

Question 2

What were the consequences of eutrophication in Kunming City?

Answer 2

Dianchi Lake algae killed 90% of:
- native water weed
- fish
- molluscs
destroyed fish culture industry

Question 3

Where does salinization occur due to irrigation?

Answer 3

The Aral Sea
- boards khazakstan
- its drying up
- cotton is grown in the desert, requires a lot of water

Question 4

What is grown by the rivers that reach aral sea that requires so much water?

Answer 4

cotton

Question 5

Explain how irrigation causes salinization

Answer 5

Water used usually has salt in it. As the water stays on the surface, it is quickly evaporated. remaining slat dehydrates the plants.
Irrigation also increases the water level. This brings existing salts from the ground to the surface. etc

Question 6

Explain why the Aral Sea is drying up.

Answer 6

The water that is flowing into the sea is redirected into agriculture, Additional irrigation -> salinization makes the water even less usable by organisms.

Question 7

What did the drying out in the sea result in?

Answer 7

The number of fish and therefore birds declines. Biodiversity is lost. The fishing industry collapsed and there are countless numbers of unemployed people. Economy is harmed, migration out of area.

Question 8

What can prevent salinization?

Answer 8

Crop covers. This helps keep vegetation at a certain temperature, minimizing evaporation