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Bla Bla Essay

311 words - 2 pages

Lecture 6: Soil & Water
1. What is Soil Water? 2. What is Groundwater? 3. How does irrigation affect soil quality? 4. What is the significance of soil erosion? 5. An example from the past: the Dust Bowl

1. What is Soil Water?
Hygroscopic •

Capillary water •

Gravitational water

2. What is Groundwater?

What is an aquitard/aquifer?

1

What is the Water Table?
Boundary between unsaturated (vadose) and saturated zones

What are the consequences of overdrawing groundwater?

What are the consequences of overdrawing ...view middle of the document...

How does irrigation affect soil quality?
What is irrigation? •

Types of Irrigation
Drip Irrigation Gravity Flow

• Turns inadequate cropland into adequate cropland

Center Pivot

3

What is Salinization?
• Accumulation of salts in and on the soil to the point that plant growth is suppressed • How can it occur?
Land impacted by salinization

Positive Feedback Mechanism
• Low ppt • Low productivity • • • • • • Initially increases productivity •

Positive Feedback Mechanism
• Low ppt • Low productivity • • Increase in desertification • Decrease in productivity • • Decrease in productivity • Initially increases productivity •

Positive Feedback Mechanism
• Low ppt • Low productivity • • Increase in desertification • Decrease in productivity • • Decrease in productivity • Initially increases productivity •

4

4. What is the significance of soil erosion?

Consequences of Soil Erosion
• e.g.: After deforestation of a hillside
Tree plantation Evapotranspiration Roads Overgrazing Winds Land Erosion Leaching Runoff Sedimentation

Question
1.

TO DO!
1. Material covered next lecture: Chapter 9 2. Report for Lab 1 is due this week 3. Reminder for Lab 2: for this week only, go to BSB-315 4. Do not forget to listen to Podcast for Lab 2!

5

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