spatial and temporal interrelationships

human ecology
1: a branch of sociology dealing especially with the spatial and temporal interrelationships between humans and their economic, social, and political organization
2: the ecology of human communities and populations especially as concerned with preservation of environmental quality (as of air or water) through proper application of conservation and civil engineering practices
[M-W’s Col. Dic.]

1: What are these “spatial and temporal interrelationships”?

2: What is difference between ‘human communities’ and ‘human populations’, and what is the purpose of mentioning them both in the definition?

3: Is it “application of conservation and civil engineering practices” supposed to be taken as: ‘application of conservation practices’ and ‘application of civil engineering practices’?

Please help me. Thanks.

Certainly difficult.

I would say that spatial is space, and temporal is time.

Communities are groups of people that have similar interests or conditions and populations are total number of people.

This isn’t much, but I hope it helps