CEP Soil Science & Analysis 3

Question 1

Redoximorphic features (mottles, gleying) in a soil profile are primarily indicators of which condition?

Accepted Answer

Periodic or seasonal soil saturation

Answer

Redoximorphic features form when soils experience periodic saturation, causing alternating oxidizing and reducing conditions that mobilize iron and manganese, leaving mottles and gleyed zones.

Question 2

The Munsell color notation '10YR 6/4' describes a soil color. What do the numbers '6' and '4' represent respectively?

Accepted Answer

Value and chroma

Answer

In Munsell notation, the format is Hue Value/Chroma; therefore 6 is the value (lightness) and 4 is the chroma (color intensity/saturation).

Question 3

Which soil order is characterized by a spodic horizon containing accumulated organic matter, aluminum, and iron, and is typically found in cool, humid forested regions?

Accepted Answer

Spodosol

Answer

Spodosols are defined by the presence of a spodic horizon — a subsurface layer enriched with illuviated amorphous aluminum, iron, and organic matter — common in cool, moist forest environments.

Question 4

Bulk density is an important soil measurement in environmental planning because it directly affects which of the following?

Accepted Answer

Soil compaction and infiltration rates

Answer

Bulk density measures the mass of soil per unit volume including pores; higher bulk density indicates compaction, which reduces pore space and restricts water infiltration and root growth.

Question 5

Under the USDA NRCS Land Capability Classification system, which class represents the most severely limited soils that are best suited only for wildlife habitat or watershed protection?

Accepted Answer

Class VIII

Answer

Class VIII soils have such severe limitations — steep slopes, severe erosion, stoniness, or waterlogging — that they are unsuitable for commercial crops, grazing, or forestry and should be reserved for recreation or wildlife.

(CEP) Certified Environmental Planner Practice Test

(CEP) Certified Environmental Planner Practice Test

CEP Soil Science & Analysis 3