What is Soil? - PowerPoint PPT Presentation

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Title:

What is Soil?

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What is Soil? a dynamic natural body composed of mineral and organic materials and living forms in which plants grow. What is soil composed of? – PowerPoint PPT presentation

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Title: What is Soil?


1
What is Soil?
  • a dynamic natural body composed of mineral and
    organic materials and living forms in which
    plants grow.

2
What is soil composed of?
  • mineral material (45)
  • organic material (5)
  • air (20-30)
  • water (20-30)

3
What are some of the uses for soils?
  • Medium for plant growth
  • recycling of nutrients and wastes
  • water supply and purification
  • habitat for soil organisms
  • engineering medium

4
How do soils form?
5
Soil development is a function of Soil Forming
Factors
  • climate
  • organisms
  • relief (topography)
  • parent material
  • time
  • HUMANS

6
Soil f (clropth)
7
Parent Material
  • Geologic material
  • eg. - weathered rock (residual)
  • - glacial deposits
  • - till (compacted)
  • - outwash (loose)
  • - alluvial (river deposited)
  • - loess (wind deposited)
  • - marine, lacustrine, ash, mudflow, organic

8
Climate
  • Precipation
  • Temperature
  • Affects physical, chemical,
  • biological processes

9
Organisms
  • Soil animals
  • Soil microbes
  • Vegetation
  • Interaction between Climate Organisms

10
Relief (or topography)
  • Affects
  • Water runoff
  • Colluvial movement
  • Solar radiation

11
Time
  • Interacts with all other
  • Soil Forming Factors

12
HUMANS
  • may increase or decrease the effects of the other
    soil forming factors
  • (many times even dramatically).

13
Different combinations and intensities of the
different soil forming factors create
different soils!
14
These differences are a result of processes
affected by the soil forming factors that
directly and indirectly affect the soil
properties.
15
Processes of Soil Formation
  • Additions
  • Losses
  • Translocations
  • Transformations

16
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17
Soil Forming Factors affecting the Soil
Processes Create the SOIL
18
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19
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20
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21
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22
Need to be concerned about our management or use
of soils
  • erosion,
  • compaction,
  • pollution,
  • available water,
  • organic matter,
  • nutrients,
  • etc

23
Soils should be managed
  • logging on steep slopes
  • loss of the forest floor
  • compaction of the soil
  • SOIL EROSION

24
Soil is a resource that should be protected from
misuse
  • because soil formation is generally considered in
    terms of centuries

25
Soils should be considered as a valuable resource
  • should be careful about our use or misuse of the
    soils
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