Soil types, composition, texture and temperature：练习题

Which of the following living organisms is a common soil constituent that helps improve soil structure by burrowing and creating channels?

What is a common consequence of the oxidation of organic matter and the loss of crumb structure in soil?

How does a high proportion of clay particles specifically influence the physical properties and management of a soil?

The diagram provided represents a soil profile with several distinct layers. Which labeled horizon is the topsoil, containing the highest concentration of organic matter and biological activity?

How does the presence of humus assist in maintaining a healthy soil structure for crop growth?

State two ways in which mulching a seedbed can protect young seedlings from extreme soil temperatures.

Explain why clay soils are more prone to waterlogging compared to sandy soils based on their particle size and pore spaces.

Describe the difference in water-holding capacity between a sandy soil and a clay soil.

A soil profile is a vertical section through the soil showing its different layers.
(a) State the names of the three main layers, also known as horizons, found in a typical soil profile. (3 points)
(b) Name one living organism, other than an earthworm, that is a common biological constituent of soil. (1 point)

(a) Describe the typical structure of a soil profile by identifying the characteristics of topsoil and subsoil.
(b) Explain how the presence of organic matter (humus) assists in the formation of a good crumb structure.
(c) State one method a farmer can use to reduce the effect of extreme soil temperatures on newly transplanted seedlings.