How land use can change the water cycle

Question 1

What percentage of the Amazon rainforest has been deforested?

Answer 1

10%

Question 2

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

Answer 2

discharge will likely to be increased throughout the entire Amazon

Question 3

What happens if rainfall does decrease via atmospheric feedbacks?

Answer 3

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

Question 4

What does subsurface drainage remove?

Answer 4

Excess water from the soil profile

Question 5

How is soil drainage carried out?

Answer 5

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

Question 6

What is soil drainage good for?

Answer 6

Moderately to poorly drained soils

Question 7

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

Answer 7

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

Question 8

What does improved aeration increase the rate of?

Answer 8

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

Question 9

What does the insertion of drains artificially increase?

Answer 9

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

Question 10

What can the dry topsoil be subject to?

Answer 10

Wind erosion if not properly protected