Answer:
Factors like native plants and other animals competing for the resources.
Step-by-step explanation:
The most important one for human civilization would definitely be the native plants because they will turn to be the ones that can be cultivated in that specific type of soil. For example, in the raining forests, cultivation like potatoes is not possible, because it's not a native plant. Another factor could be the other animals, or native animals, that compete for resources in that ecosystem, as they also interact with it, they would also be part of the decrease or increase of carrying capacity.