The plants of the forest compete for access to various site factors, such as water, sunlight and nutrients. Site factors are part of the non-living environment.
The living nature of the forest is comprised of all the living organisms that inhabit it.
Dry pine forests are common in Northern Europe. Pine trees thrive in sandy soil that is low in nutrients.
Spruce forests and broadleaf forests grow in places where the soil is water-absorbent and rich in nutrients.