To maintain forests by planting tree planting crops and trees covered the ground to suppress rain water flowing into the lower too quickly and prevent erosion, corrosion damage, dirt page.
To reforestation by planting trees and vegetation-covered ground. To block the water flow into the low too quickly. Erosion and destruction of soil erosion.
Treatment of forest by forest trees and vegetation covered the ground to block, no rain water flows downhill fast. And prevent erosion, corrosion, destroy the face of the earth.