How land use can change the water cycle Flashcards Preview

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Flashcards in How land use can change the water cycle Deck (10)
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1
Q

What percentage of the Amazon rainforest has been deforested?

A

10%

2
Q

What happens if deforestation does not cause decreased rainfall via atmospheric feedbacks?

A

discharge will likely to be increased throughout the entire Amazon

3
Q

What happens if rainfall does decrease via atmospheric feedbacks?

A

the resulting decrease in river discharge may be greater than the changes without feedbacks

4
Q

What does subsurface drainage remove?

A

Excess water from the soil profile

5
Q

How is soil drainage carried out?

A

Through a network of perforated tubes installed 60-120 cm below soil surface

6
Q

What is soil drainage good for?

A

Moderately to poorly drained soils

7
Q

What does the build up of an improved soil structure make?

A

The soil easier to work and easier to achieve greater root penetration

8
Q

What does improved aeration increase the rate of?

A

At which organic matter is broken down into humus and plant nutrients are mineralised into a available form

9
Q

What does the insertion of drains artificially increase?

A

The speed of throughflow in the soil, so much more water reaches watercourses quickly increasing chance of flooding

10
Q

What can the dry topsoil be subject to?

A

Wind erosion if not properly protected