Planting forests to absorb water in the North. It's not effective because it has a northern slope high speed flow water. Therefore, there is no water in the soil to absorb too much.
Planting trees to absorb the water in the north. It is highly unlikely For the North, it is high. The water flow velocity Therefore, there is no time to allow the soil to absorb very much.
Forest for water absorption in the north, it does not have the high effectiveness Because the northern area. It has high slope, water flow speed. So the water in no time to keep the soil to absorb so much.