Question

which type of succession is sometimes referred to as \old field succession\? secondary primary intermediate

Explanation:

Secondary succession occurs in areas where a disturbance has destroyed an existing community but left the soil intact. An "old field" is an example of this as it was previously used for agriculture (a disturbance) but the soil remains. Primary succession starts on bare rock with no soil. Intermediate is not a standard term for this type of ecological succession context.

Answer:

secondary