FM FM Soil Science & Hydrology

Question 1

Which soil property most directly determines water infiltration rates in forest soils?

Accepted Answer

Soil texture

Answer

Soil color

Answer

Depth to bedrock

Answer

Organic matter color

Question 2

Which soil horizon typically contains the highest concentration of organic matter in a forest soil profile?

Accepted Answer

A horizon

Answer

B horizon

Answer

C horizon

Answer

R horizon

Question 3

What is 'field capacity' in the context of forest soil hydrology?

Accepted Answer

The amount of water soil retains after gravitational drainage

Answer

The maximum water a soil holds when fully saturated

Answer

The minimum water available to plants before wilting

Answer

The rate at which water moves through the soil profile

Question 4

Which process describes the downward movement of water through soil layers toward groundwater?

Accepted Answer

Percolation

Answer

Evapotranspiration

Answer

Interception

Answer

Overland flow

Question 5

In a mature, undisturbed forest watershed, what approximate percentage of annual precipitation typically becomes streamflow?

Accepted Answer

10–30%

Answer

70–80%

Answer

50–60%

Answer

40–50%

Question 6

What is the primary hydrological function of riparian buffer zones in forest management?

Accepted Answer

Filter sediment and nutrients from runoff before it enters streams

Answer

Increase timber production near streams

Answer

Reduce wildlife movement corridors

Answer

Raise stream water temperatures in winter

Question 7

Which soil classification system is the standard used in US forest soil surveys and management?

Accepted Answer

USDA Soil Taxonomy

Answer

World Reference Base (WRB)

Answer

Canadian System of Soil Classification

Answer

FAO Soil Classification