The way to adjust the forest population density can be natural thinning, and the inferior trees can be eliminated by using the competitive advantage in the natural growth process of trees. Commercial forests are mostly in the form of artificial tending, thus achieving the goal of eliminating inferior trees.

The main ecological functions and functions of riparian forest are: filtering runoff, slowing down flow velocity, filtering runoff, protecting waterfront and roots, and resisting water wave impact. Absorbing nutrients, np effectively controls floods. Provide food and habitat for wildlife, and provide shade through the forest canopy. The main ways to adjust water temperature, shelter and forest population density are.

Density control and adjustment, under the condition of superior resources, through tree differentiation and natural thinning, eliminate disadvantages and preserve advantages, so that the preserved individuals can grow better and keep the stand stable. Non-density limiting regulation, generally under unfavorable site conditions, inhibits the growth of trees through evolutionary adaptation, the stand is never closed, and the forest population is dominated by non-density limiting factors.