Limiting Factors and Human Impacts
Because the savanna can be such a dry place, it is subject to many wildfires, which burns down trees and grasses, in other words, it is burning down many organisms habitat. Humans also contribute to this by starting the fires to clear land for themselves.
Another human impact is tree clearing, humans are clearing trees in the savanna so that they can grow food for their livestock and the competition for water wont be as big if they cut down the trees.