Chapter 15 #2 Flashcards Preview

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Flashcards in Chapter 15 #2 Deck (20)
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1
Q

Soil Texture

A

relative proportions of different sized inorganic particles of silt, sand, and clay

2
Q

Sand

A

largest soil particle

.05mm-2mm

3
Q

Silt

A

Medium sized particles

.002mm-.05mm

4
Q

Clay

A

smallest particles

<.002mm

5
Q

ions

A

charged (+/-) forms of particles

6
Q

loam

A

ideal agricultural soil

40% sand

40% silt

20% clay

7
Q

Soil Acidity

A

pH

most soils 4 to 8

some outside

influences plants, and other life

8
Q

soil taxonomy

A

classification of soils into 12 orders then into a series

9
Q

spodosols

A

coniferous forests

acidic O

leached E

Dark B, rich in orgainic material, illuvial

acidic, nutrient poor

10
Q

alfisols

A

temperate deciduous

brown-gray A

fertile plant litter

11
Q

mollisols

A

soft plant life

semiarid grasslands

humus-rich A

12
Q

aridisols

A

arid

no distinct layers of illuviation

not much organic matter

some have salty O

13
Q

Oxisols

A

low nutrient

tropical, subtropical

little litter because rapid decomposition

A rich with humus

B leached, acidic

14
Q

Sustainable Soil use

A

wise use of soil so fertility or amount of soil does not drop

benefits future generations

15
Q

Soil erosion

A

water, wind, ice, other agents

wearing away or removal of soil from land

accelerated by poor management of soil

16
Q

Dust Bowl

A

In midwest 65% less rainfall than normal

Wheat died, soil vulnerable to wind erosion

Huge dust storms

17
Q

Nutrient Mineral Depletion

A

crop harvest disrupts nutrient cycling

much of nutrients is taken out of cycle

18
Q

Mineral Depletion in Rainforests

A

climate, soil type, human intervention-> mineral depletion

nutrient poor soils, moisture absorbed by fungi

clearing of forest disrupts mineral cycle

19
Q

Salinization

A

soils in arid regions contain many mineral salts

gradual accumulation of salt in soil from improper irrigation techniques

20
Q

Desertifiation

A

degradation of once fertile range land, or agricultural land into a nonproductive desert