Soil forming factors can include climate, parent material, vegetation, animal activity, fire and influence by humans.
I have investigated a podzol soil profile with horizons LFH, AH, AE, BF and parent material.
I can see how climate would affect the LFH, AH AND AE. Precipitation has caused these horizons to be cohesive and climate has provided a growing period for plants, which has caused a presence of organic materials in these layers.
Vegetation has also played a role in the LFH, AH and AE. The roots of plants and trees have caused a presence of organic materials in these horizons.
I am not quite sure if animal activity has played a role in the soil profile. Besides the decomposition of bodies and the fertilization by faeces, I am not sure if animal presence has played any more of a role than this. There was also no evidence of fire in these horizons that I witnessed.
My question is, if animal presence is a contributing factor, what horizons would it play a role in?
Also, I'm not quite sure how humans or parent material have influenced soil profile. Looking for some guidance with this.